PanoramicData.NCalcExtensions

Introduction

This nuget package provides extension functions for NCalc.

The NCalc documentation can be found here (source code) and here (good explanation of built-in functions).

Functions

Function	Purpose	Notes
all()	Returns true if all values match the lambda expression, otherwise false.
any()	Returns true if any values match the lambda expression, otherwise false.
canEvaluate()	Determines whether ALL of the parameters can be evaluated. This can be used, for example, to test whether a parameter is set.
capitalize()	Capitalizes a string.
cast()	Cast an object to another (e.g. float to decimal).
changeTimeZone()	Change a DateTime's time zone.
concat()	Concatenates lists and objects.
contains()	Determines whether one string contains another.
convert()	Converts the output of parameter 1 into the result of parameter 2.
count()	Counts the number of items. Optionally, only count those that match a lambda.
countBy()	Counts the number of items by a calculated term.
dateAdd()	Add a specified interval to a DateTime.
dateTime()	Return the DateTime in the specified format as a string, with an optional offset.
dateTimeAsEpoch()	Parses the input DateTime and outputs as seconds since the Epoch (1970-01-01T00:00Z).
dateTimeAsEpochMs()	Parses the input DateTime and outputs as milliseconds since the Epoch (1970-01-01T00:00Z).
dictionary()	Builds a Dictionary<string, object?> from the parameters provided.
distinct()	Returns only distinct items from the input.
endsWith()	Determines whether a string ends with another string.
extend()	Extends an existing object into a JObject with both the original and additional properties.
first()	Returns the first item in a list that matches a lambda or throws a FormatException if no items match.
firstOrDefault()	Returns the first item in a list that matches a lambda or null if no items match.
format()	Formats strings and numbers as output strings with the specified format.
getProperties()	Returns a list of property names for an object.
getProperty()	Returns the value of a given property.
humanize()	Converts a value to a more readable format.
if()	Return one of two values, depending on the input function.
in()	Determines whether a value is in a set of other values.
indexOf()	Determines the first position of a string within another string.
isGuid()	Determines whether a value is a GUID, or is a string that can be converted to a GUID.
isInfinite()	Determines whether a value is infinite.
isNaN()	Determines whether a value is not a number.
isNull()	Determines whether a value is null.
isNullOrEmpty()	Determines whether a value is null or empty.
isNullOrWhiteSpace()	Determines whether a value is null, empty or white space.
isSet()	Determines whether a parameter is set.
itemAtIndex()	Determines the item at the given index.
jObject()	Creates a JObject from key/value pairs.
join()	Joins a list of strings into a single string.
jPath()	Selects a single value from a JObject using a JPath expression
last()	Determines the last value in an IEnumerable. Throws an Exception if no item matches.
lastIndexOf()	Determines the last position of a string within another string.
lastOrDefault()	Determines the last value in an IEnumerable. Returns null if no item matches.
length()	Determines length of a string or IList.
list()	Emits a List<object?> and collapses down lists of lists to a single list.
listOf()	Emits a List<T>.
max()	Emits the maximum value, ignoring nulls.
maxValue()	Emits the maximum possible value for a given numeric type.
min()	Emits the minimum value, ignoring nulls.
minValue()	Emits the minimum possible value for a given numeric type.
nullCoalesce()	Returns the first parameter that is not null, otherwise: null.
orderBy()	Orders an IEnumerable by one or more lambda expressions.
padLeft()	Pad the left of a string with a character to a desired string length.
parse()	Returns the conversion of a string to a new type.
parseInt()	Returns an integer version of a string.	Deprecated - use parse() or tryParse() instead)
regexGroup()	Selects a regex group capture.
regexIsMatch()	Determine whether a string matches a regex.
replace()	Replace a string with another string.
retrieve()	Retrieves a value from storage.
reverse()	Reverses an IEnumerable and emits a List<object?>.
sanitize()	Sanitizes a string, replacing any characters outside of the allowed set.
select()	Converts an IEnumerable using a lambda.
selectDistinct()	Converts an IEnumerable using a lambda and removes duplicates.
setProperties()	Sets properties on an existing object.
skip()	Skips a number of items in a list.
sort()	Sorts an IComparable ascending or descending.
split()	Splits a string on a given character into a list of strings.
startsWith()	Determines whether a string starts with another string.
store()	Stores a value for use later in the pipeline.
substring()	Retrieves part of a string.
sum()	Sums numeric items.
switch()	Return one of a number of values, depending on the input function.
take()	Takes a number of items from a list.
throw()	Throws an NCalcExtensionsException.
timeSpan()	Determines the amount of time between two DateTimes.
toDateTime()	Converts a string to a UTC DateTime. May take an optional inputTimeZone.
toLower()	Converts a string to lower case.
toString()	Converts any object to a string.
toUpper()	Converts a string to upper case.
try()	If a function throws an exception, return an alternate value.
tryParse()	Returns a boolean result of an attempted cast
typeOf()	Determines the C# type of the object.
where()	Filters an IEnumerable to bring back only those items that match a condition.

Usage

using PanoramicData.NCalcExtensions;

...
var calculation = "lastIndexOf('abcdefg', 'def')";
var nCalcExpression = new ExtendedExpression(calculation);

if (nCalcExpression.HasErrors())
{
	throw new FormatException($"Could not evaluate expression: '{calculation}' due to {nCalcExpression.Error}.");
}

return nCalcExpression.Evaluate();

Namespace safety

Note that we regularly extend this library to add new functions. For those that further extend the functions, it is important to avoid future potential namespace conflicts. For this reason, we guarantee that we will never use the underscore character in any future function name and we recommend that any functions that you add DO include an underscore. For example, if you had a project called "My Project", we suggest that you name your functions as follows:

mp_myFunction1()
mp_myFunction2()

Contributing

Pull requests are welcome! Please submit your requests for new functions in the form of pull requests.

Function documentation

all()

Purpose

Returns true if all values match the lambda expression, otherwise false.

Parameters

list - the original list
predicate - (optional) a string to represent the value to be evaluated
nCalcString - (optional, but must be provided if predicate is) the string to evaluate

Examples

all() : true
all(list(false, false, false)) : false
all(list(true, false, true)) : false
all(list(true, true, true)) : true
all(list(1, 2, 3, 4, 5), 'n', 'n < 3') : false
all(list(1, 2, 3, 4, 5), 'n', 'n > 0 && n < 10') : true

any()

Purpose

Returns true if any values match the lambda expression, otherwise false.

Parameters

list - the original list
predicate - (optional) a string to represent the value to be evaluated
nCalcString - (optional, but must be provided if predicate is) the string to evaluate

Examples

any(list()) : false
any(list(1, 2, 3)) : true
any(list(1, 2, 3, 4, 5), 'n', 'n < 3') : true
any(list(1, 2, 3, 4, 5), 'n', 'n > 11') : false

canEvaluate()

Purpose

Determines whether ALL of the parameters can be evaluated. This can be used, for example, to test whether a parameter is set.

Parameters

parameter1, parameter2, ...

Examples

canEvaluate(nonExistent) : false
canEvaluate(1) : true

capitalize()

Purpose

Capitalizes a string.

Parameters

string

Examples

capitalize('new year') : 'New Year'

cast()

Purpose

Cast an object to another (e.g. float to decimal).

Notes

The method requires that conversion of value to target type be supported.

Parameters

inputObject
typeString

Examples

cast(0.3, 'System.Decimal')

changeTimeZone()

Purpose

Change a DateTime's time zone.

Notes

For a list of supported TimeZone names, see https://docs.microsoft.com/en-us/dotnet/api/system.timezoneinfo.findsystemtimezonebyid?view=netstandard-2.0

Parameters

source DateTime
source TimeZone name
destination TimeZone name

Examples

changeTimeZone(theDateTime, 'UTC', 'Eastern Standard Time')
changeTimeZone(theDateTime, 'Eastern Standard Time', 'UTC')

concat()

Purpose

Concatenates lists and objects.

Notes

The examples all result in a List<object?> containing 4 integers: 1, 2, 3 and 4.

Parameters

the lists or objects to concatenate

Examples

concat(list(1, 2), list(3, 4))
concat(list(1, 2, 3, 4))
concat(1, 2, 3, 4)
concat(list(1, 2, 3), 4)
concat(1, list(2, 3, 4))

contains()

Purpose

Determines whether one string contains another.

Parameters

string searched-in text
string searched-for text

Examples

contains('haystack containing needle', 'needle') : true
contains('haystack containing only hay', 'needle') : false

convert()

Purpose

Converts the output of parameter 1 into the result of parameter 2.

Notes

Can be used to return an empty string instead of the result of parameter 1, which can be useful when the return value is not useful. The result of parameter 1 is available as the variable "value".

Parameters

the value to calculate
destination TimeZone name

Examples

convert(anyFunction(), 'XYZ'): 'XYZ'
convert(1 + 1, value + 1): 3

count()

Purpose

Counts the number of items. Optionally, only count those that match a lambda.

Parameters

list - the original list
predicate (optional) - a string to represent the value to be evaluated
nCalcString (optional) - the string to evaluate

Examples

count('a piece of string') : 17
count(list(1, 2, 3, 4, 5)) : 5
count(list(1, 2, 3, 4, 5), 'n', 'n > 3') : 2

countBy()

Purpose

Counts the number of items, grouped by a calculation.

Parameters

list - the original list
predicate - a string to represent the value to be evaluated
nCalcString - the string to evaluate. Must emit a string containing one or more characters: A-Z, a-z, 0-9 or _.

Examples

countBy(list(1, 2, 2, 3, 3, 3, 4), 'n', 'toLower(toString(n > 1))') : { 'false': 1, 'true': 6 }
countBy(list(1, 2, 2, 3, 3, 3, 4), 'n', 'toString(n)') : { '1': 1, '2': 2, '3', 3, '4', '1 }

dateAdd()

Purpose

Add a specified period to a DateTime. The following units are supported:

Years
Months
Days
Hours
Minutes
Seconds
Milliseconds

Parameters

intialDateTime - A DateTime to which to add the period specified
quantity - The integer number of the units to be added
units - A string representing the units used to specify the period to be added

Examples

dateAdd(toDateTime('2019-03-05 05:09', 'yyyy-MM-dd HH:mm'), -90, 'days') : 90 days before (2018-12-05 05:09:00)
dateAdd(toDateTime('2019-03-05 01:03:05', 'yyyy-MM-dd HH:mm:ss'), 2, 'hours') : 2 hours later (2019-03-05 03:03:05)

dateTime()

Purpose

Return the DateTime in the specified format as a string, with an optional offset.

Parameters

timeZone (only 'UTC' currently supported)
format
day offset
hour offset
minute offset
second offset

Examples

dateTime('UTC', 'yyyy-MM-dd HH:mm:ss', -90, 0, 0, 0) : 90 days ago (e.g. '2019-03-14 05:09')
dateTime('UTC', 'yyyy-MM-dd HH:mm:ss') : now (e.g. '2019-03-14 05:09')

dateTimeAsEpoch()

Purpose

Parses the input DateTime and outputs as seconds since the Epoch (1970-01-01T00:00Z).

Parameters

input date string
format

Examples

dateTimeAsEpoch('20190702T000000', 'yyyyMMddTHHmmssK') : 1562025600

dateTimeAsEpochMs()

Purpose

Parses the input DateTime and outputs as milliseconds since the Epoch (1970-01-01T00:00Z).

Parameters

input date string
format

Examples

dateTimeAsEpochMs('20190702T000000', 'yyyyMMddTHHmmssK') : 1562025600000

dictionary()

Purpose

Emits a Dictionary<string, object?>.

Parameters

interlaced keys and values. You must provide an even number of parameters, and keys must evaluate to strings.

Examples

dictionary('KEY1', 'Hello', 'KEY2', 'Goodbye') : a dictionary containing 2 values with keys KEY1 and KEY2, and string values
dictionary('TRUE', true, 'FALSE', false) : a dictionary containing 2 values with keys TRUE and FALSE, and boolean values

distinct()

Purpose

Returns only distinct items from the input.

Parameters

list - the original list

Examples

distinct(list(1, 2, 3, 3, 3)) : list(1, 2, 3)

endsWith()

Purpose

Determines whether a string ends with another string.

Parameters

longString
shortString

Examples

endsWith('abcdefg', 'fg') : true
endsWith('abcdefg', 'fgh') : false

extend()

Purpose

Extends an existing object into a JObject with both the original and additional properties.

Parameters

originalObject
listOfAdditionalProperties

Examples

extend(jObject('a', 1, 'b', null), list('c', 5)) : JObject with a=1, b=null and c=5

first()

Purpose

Returns the first item in a list that matches a lambda or throws a FormatException if no items match.

Parameters

list
predicate
lambda expression as a string

Examples

first(list(1, 5, 2, 3), 'n', 'n % 2 == 0') : 2
first(list(1, 5, 7, 3), 'n', 'n % 2 == 0') : FormatException thrown

firstOrDefault()

Purpose

Returns the first item in a list that matches a lambda or null if no items match.

Parameters

list
predicate
lambda expression as a string

Examples

firstOrDefault(list(1, 5, 2, 3), 'n', 'n % 2 == 0') : 2
firstOrDefault(list(1, 5, 7, 3), 'n', 'n % 2 == 0') : null

format()

Purpose

Formats strings and numbers as output strings with the specified format.

Parameters

object (number or text)
format: the format to use

see C# number and date/time formatting
weekOfMonth is the numeric week of month as would be shown on a calendar with one row per week with weeks starting on a Sunday
weekOfMonthText is the same as weekOfMonth, but translated: 1: 'first', 2: 'second', 3: 'third', 4: 'forth', 5: 'last'
weekDayOfMonth is the number of times this weekday has occurred within the month so far, including this one
weekDayOfMonthText is the same as weekDayOfMonth, but translated: 1: 'first', 2: 'second', 3: 'third', 4: 'forth', 5: 'last'

timeZone [optional] - see https://docs.microsoft.com/en-us/dotnet/api/system.timezoneinfo.findsystemtimezonebyid?view=netstandard-2.0

Examples

format(1, '00') : '01'
format(1.0, '00') : '01'
format('2021-11-29', 'dayOfYear') : '333'
format('2021-11-01', 'weekOfMonth') : 1
format('2021-11-01', 'weekOfMonthText') : 'first'
format('2021-11-28', 'weekOfMonth') : 5
format('2021-11-28', 'weekOfMonthText') : 'last'
format('2021-11-28', 'weekDayOfMonth') : 4
format('2021-11-28', 'weekDayOfMonthText') : 'forth'
format('01/01/2019', 'yyyy-MM-dd') : '2019-01-01'
format(theDateTime, 'yyyy-MM-dd HH:mm', 'Eastern Standard Time') [where theDateTime is a .NET DateTime, set to DateTime.Parse("2020-03-13 16:00", CultureInfo.InvariantCulture)] : '2020-03-13 12:00'

getProperties()

Purpose

Gets a list of an object's properties.

Parameters

sourceObject

Examples

getProperties(parse('jObject', '{ "A": 1, "B": 2 }')) : [ 'A', 'B' ]
getProperties(toDateTime('2019-01-01', 'yyyy-MM-dd')) : [ 'Date', 'Day', 'DayOfWeek', 'DayOfYear', 'Hour', 'Kind', 'Millisecond', 'Microsecond', 'Nanosecond', 'Minute', 'Month', 'Now', 'Second', 'Ticks', 'TimeOfDay', 'Today', 'Year', 'UtcNow' ]

getProperty()

Purpose

Gets an object's property.

Parameters

sourceObject
propertyName

Examples

getProperty(toDateTime('2019-01-01', 'yyyy-MM-dd'), 'Year') : 2019 (int)

humanize()

Purpose

Humanizes the value text.

Parameters

value
timeUnit

Examples

humanize(3600, 'seconds') : '1 hour'

if()

Purpose

Return one of two values, depending on the input function.

Parameters

condition
output if true
output if false

Examples

if(1 == 1, 'yes', 'no') : 'yes'
if(1 == 2, 3, 4) : 4

in()

Purpose

Determines whether a value is in a set of other values.

Parameters

list
item

Examples

in('needle', 'haystack', 'with', 'a', 'needle', 'in', 'it') : true
in('needle', 'haystack', 'with', 'only', 'hay') : false

indexOf()

Purpose

Determines the first position of a string within another string.

Notes

The first character is position 0. Returns -1 if not present.

Parameters

longString
shortString

Examples

indexOf('#abcabc#', 'abc') : 1
indexOf('#abcabc#', 'abcd') : -1

isGuid()

Purpose

Determines whether a value is a GUID, or is a string that can be converted to a GUID.

Parameters

value

Examples

isGuid('9384EF0Z-38AD-4E8E-A24E-0ACD3273A401') : true
isGuid('{9384EF0Z-38AD-4E8E-A24E-0ACD3273A401}') : true
isGuid('abc') : false

isInfinite()

Purpose

Determines whether a value is infinite.

Parameters

value

Examples

isInfinite(1/0) : true
isInfinite(0/1) : false

isNaN()

Purpose

Determines whether a value is not a number.

Parameters

value

Examples

isNaN(null) : true
isNaN('abc') : true
isNaN(1) : false

isNull()

Purpose

Determines whether a value is null.

Notes

Returns true if the value is:

null; or
it's a JObject and it's type is JTokenType.Null.

Parameters

value

Examples

isNull(1) : false
isNull('text') : false
isNull(bob) : true if bob is null
isNull(null) : true

isNullOrEmpty()

Purpose

Determines whether a value is null or empty.

Notes

True if:

null; or
it's a JObject and it's type is JTokenType.Null or;
it's a string and it's empty.

Parameters

value

Examples

isNullOrEmpty(null) : true
isNullOrEmpty('') : true
isNullOrEmpty(' ') : false
isNullOrEmpty(bob) : true if bob is null or whitespace
isNullOrEmpty(1) : false
isNullOrEmpty('text') : false

isNullOrWhiteSpace()

Purpose

Determines whether a value is null, empty or whitespace.

Notes

Returns true is the value is:

null; or
it's a JObject and it's type is JTokenType.Null or;
it's a string and it's empty or only contains whitespace characters (\r, \n, \t, or ' ').

Parameters

value

Examples

isNullOrWhiteSpace(null) : true
isNullOrWhiteSpace('') : true
isNullOrWhiteSpace(' ') : true
isNullOrWhiteSpace(bob) : true if bob is null or whitespace
isNullOrWhiteSpace(1) : false
isNullOrWhiteSpace('text') : false

isSet()

Purpose

Determines whether a parameter is set.

Parameters

parameter name

Examples

isSet('a') : true/false depending on whether a is an available variable

itemAtIndex()

Purpose

Determines the item at the given index. The first index is 0.

Parameters

parameter name

Examples

itemAtIndex(split('a b c', ' '), 1) : 'b'

jArray()

Purpose

Creates a Newtonsoft JArray from input values.

Parameters

items[]

Examples

jArray(jObject('a', 1, 'b', null), jObject('a', 2, 'b', #2024-06-21#)) : JArray [ { "a": 1, "b": null}, { "a": 2, "b": "2024-06-21T00:00:00"} ]
jArray(1, null, 'woo') : JArray [ 1, null, "woo" ]

jObject()

Purpose

Creates a JObject from key/value pairs.

Parameters

key1 (string)
value1
key2 (string)
value2
...
keyN
valueN

Examples

jObject('a', 1, 'b', null) : JObject{ "a": 1, "b": null}

join()

Purpose

Joins a list of strings into a single string.

Parameters

parameter name

Examples

join(split('a b c', ' '), ', ') : 'a, b, c'

jPath()

Purpose

Selects a single value from a JObject using a JPath expression

Parameters

input JObject
JPath string expression

Examples

sourceJObject JSON:

{
"name": "bob",
"details": {
   "this.thing": "woo",
   "that.thing": "yay",
},
"numbers": [ 1, 2 ],
"arrayList": [ 
	{ "key": "key1", "value": "value1" },
	{ "key": "key2", "value": "value2" } 
]
}

jPath(sourceJObject, 'name') : 'bob'
jPath(sourceJObject, 'details.['this.thing']') : 'woo'
jPath(sourceJObject, 'size') : an exception is thrown
jPath(sourceJObject, 'size', True) : null is returned
jPath(sourceJObject, 'numbers[0]') : 1
jPath(sourceJObject, 'arrayList[?(@key==\'key1\')]') : "value1"

Purpose

Returns the last item in a list that matches a lambda or throws a FormatException if no items match. Note that items are processed in reverse order.

Parameters

list
predicate
lambda expression as a string

Examples

first(list(1, 5, 2, 3, 4, 1), 'n', 'n % 2 == 0') : 4
first(list(1, 5, 7, 3), 'n', 'n % 2 == 0') : FormatException thrown

lastIndexOf()

Purpose

Determines the last position of a string within another string. Returns -1 if not present.

Parameters

longString
shortString

Examples

lastIndexOf('#abcabc#', 'abc') : 4
lastIndexOf('#abcabc#', 'abcd') : -1

lastOrDefault()

Purpose

Returns the last item in a list that matches a lambda or null if no items match. Note that items are processed in reverse order.

Parameters

list
predicate
lambda expression as a string

Examples

lastOrDefault(list(1, 5, 2, 3, 4, 1), 'n', 'n % 2 == 0') : 4
lastOrDefault(list(1, 5, 7, 3), 'n', 'n % 2 == 0') : null

length()

Purpose

Determines length of a string or IList.

Parameters

string or IList

Examples

length('a piece of string') : 17
length(split('a piece of string', ' ')) : 4

list()

Purpose

Emits a List<object?> and collapses down lists of lists to a single list.

Parameters

the parameters

Examples

list('', 1, '0')
list(null, 1, '0')
list(list(null, 1, '0'), 1, '0')

listOf()

Purpose

Emits a List<T>.

Parameters

the type
the parameters

Examples

listOf('object?', '', 1, '0')
listOf('object?', null, 1, '0')
listOf('int?', 1, null, 3)
listOf('string', '1', '2', 3) : throws an exception

max()

Purpose

Emits the maximum value, ignoring nulls.

Parameters

the list
optionally, a pair of parameters providing a lambda expression to be evaluated.

Examples

max(listOf('int?', 1, null, 3)) : 3
max(listOf('int', 1, 2, 3), 'x', 'x + 1') : 4
max(listOf('string', '1', '2', '3')) : '3'
max(listOf('string', '1', '2', '3'), 'x', 'x + x') : '33'

maxValue()

Purpose

Emits the maximum possible value for a given numeric type.

Parameters

a string representing the type, which must be one of 'sbyte', 'byte', 'short', 'ushort', 'int', 'uint', 'long', 'ulong', 'float', 'double' or 'decimal'.

Examples

maxValue('byte') : (byte)255
maxValue('ushort') : (ushort)65535

min()

Purpose

Emits the minimum value, ignoring nulls.

Parameters

the list
optionally, a pair of parameters providing a lambda expression to be evaluated.

Examples

min(listOf('int?', 1, null, 3)) : 1
min(listOf('int', 1, 2, 3), 'x', 'x + 1') : 2
min(listOf('string', '1', '2', '3')) : '1'
min(listOf('string', '1', '2', '3'), 'x', 'x + x') : '11'

minValue()

Purpose

Emits the minimum possible value for a given numeric type.

Parameters

a string representing the type, which must be one of 'sbyte', 'byte', 'short', 'ushort', 'int', 'uint', 'long', 'ulong', 'float', 'double' or 'decimal'.

Examples

minValue('byte') : (byte)0
minValue('ushort') : (ushort)0

nullCoalesce()

Purpose

Returns the first parameter that is not null, otherwise: null.

Parameters

any number of objects

Examples

nullCoalesce() : null
nullCoalesce(1, null) : 1
nullCoalesce(null, 1, 2, 3) : 1
nullCoalesce(null, null, null) : null
nullCoalesce(null, null, 'xxx', 3) : 'xxx'

orderBy()

Purpose

Orders an IEnumerable by one or more lambda expressions.

Parameters

list - the original list
predicate - a string to represent the value to be evaluated
nCalcString1 - the first orderBy lambda expression
nCalcString2 (optional) - the next orderBy lambda expression
nCalcString... (optional) - the next orderBy lambda expression

Examples

orderBy(list(34, 33, 2, 1), 'n', 'n') : list(1, 2, 33, 34)
orderBy(list(34, 33, 2, 1), 'n', '-n') : list(34, 33, 2, 1)
orderBy(list(34, 33, 2, 1), 'n % 32', 'n % 2') : list(34, 33, 1, 2)
orderBy(list(34, 33, 2, 1), 'n % 2', 'n % 32') : list(33, 1, 34, 2)

padLeft()

Purpose

Pad the left of a string with a character to a desired string length.

Parameters

stringToPad
desiredStringLength (must be >=1)
paddingCharacter

Examples

padLeft('', 1, '0') : '0'
padLeft('12', 5, '0') : '00012'
padLeft('12345', 5, '0') : '12345'
padLeft('12345', 3, '0') : '12345'

parse()

Purpose

Returns the conversion of a string to a numeric type. Supported types are:

bool or System.Boolean
sbyte or System.SByte
byte or System.Byte
short or System.Int16
ushort or System.UInt16
int or System.Int32
uint or System.UInt32
long or System.Int64
ulong or System.UInt64
double or System.Double
float or System.Single
decimal or System.Decimal
JArray or Newtonsoft.Json.Linq.JArray (jArray also supported for backaward compatibility)
JObject or Newtonsoft.Json.Linq.JObject (jObject also supported for backaward compatibility)
Guid

Parameters

type (see above)
text
valueIfParseFails (optional)

Examples

parse('int', '1') : 1
parse('System.Int32', '1') : 1
parse('bool', 'x', null) : null
parse('jObject', '{ "a" : 1 }', null) : JObject { "a": 1 }
parse('jArray', '[ { "a" : 1 } ]', null) : JArray [{ "a": 1 }]

parseInt()

Purpose

Returns an integer version of a string.

Parameters

integerAsString

Examples

parseInt('1') : 1

regexGroup()

Purpose

Selects a regex group capture

Parameters

input
regex
zero-based capture index (default: 0)

Examples

regexGroup('abcdef', '^ab(.+?)f$') : 'cde'
regexGroup('abcdef', '^ab(.)+f$') : 'c'
regexGroup('abcdef', '^ab(.)+f$', 1) : 'd'
regexGroup('abcdef', '^ab(.)+f$', 2) : 'e'
regexGroup('abcdef', '^ab(.)+f$', 10) : null

regexIsMatch()

Purpose

Determine whether a string matches a regex

Parameters

input
regex

Examples

regexIsMatch('abcdef', '^ab.+') : true
regexIsMatch('Zbcdef', '^ab.+') : false

replace()

Purpose

Replace a string with another string

Parameters

haystackString
needleString
betterNeedleString

Examples

replace('abcdefg', 'cde', 'CDE') : 'abCDEfg'
replace('abcdefg', 'cde', '') : 'abfg'

retrieve()

Purpose

Retrieves a value from storage

Parameters

key

Examples

retrieve('thing')

reverse()

Purpose

Reverses an IEnumerable.

Parameters

list

Examples

reverse(list(1, 2, 3, 4, 5, 5) : 5, 5, 4, 3, 2, 1

sanitize()

Purpose

Sanitize a string, replacing any characters outside of the allowed set.

Parameters

input - the string to be sanitized
allowedCharacters - all of the characters that are allowed
replacementCharacters (optional) - the characters to insert in place of any that are not allowed (defaults : empty string)

Examples

sanitize('ab cd', 'abcdefghi') : 'abcd'
sanitize('ab cd./', 'abcdefghi.') : 'abcd.'
sanitize('ab cd./', 'CBa') : 'a'
sanitize('ab cd', 'abCD', '?') : 'ab???'
sanitize('ab cd', 'ab', '?') : 'ab???'
sanitize('ab cd', 'ab', '-') : 'ab---'

select()

Purpose

Converts an IEnumerable using a lambda.

Parameters

list - the original list
predicate - a string to represent the value to be evaluated
nCalcString - the value to evaluate to for each item in the list
output list type - outputs a list of the specified type (optional)

Examples

select(list(1, 2, 3, 4, 5), 'n', 'n + 1') : list(2, 3, 4, 5, 6)
select(list(jObject('a', 1, 'b', '2'), jObject('a', 3, 'b', '4')), 'n', 'n', 'JObject') : list of JObjects

selectDistinct()

Purpose

Converts an IEnumerable using a lambda and removes duplicates.

Parameters

list - the original list
predicate - a string to represent the value to be evaluated
nCalcString - the value to evaluate to for each item in the list

Examples

selectDistinct(list(1, 2, 3, 3, 3), 'n', 'n + 1') : list(2, 3, 4)

setProperties()

Purpose

Sets properties on an existing object.

Parameters

object - the original object
property1 - the first new property name
value1 - the first new property value
propertyN (optional) - the nth new property name
valueN (optional) - the nth new property value

Examples

setProperties(jObject('a', 1, 'b', null), 'c', 'X') : jObject('a', 1, 'b', null, 'c', 'X')
setProperties(jObject('a', 1, 'b', null), 'c', 'X', 'd', 'Y') : jObject('a', 1, 'b', null, 'c', 'X', 'd', 'Y')

skip()

Purpose

Skips a number of items in a list.

Notes

If the number of items to skip is greater than the number of items in the list, an empty list is returned.

Parameters

the list to skip from
the number of items to skip

Examples

skip(list(1, 2, 3), 1): list(2, 3)

sort()

Purpose

Sorts an IComparable ascending or descending.

Parameters

list - the original list
direction (optional) - 'asc' is the default, 'desc' is the other option

Examples

sort(list(2, 1, 3)) : list(1, 2, 3)
sort(list(2, 1, 3), 'asc') : list(1, 2, 3)
sort(list(2, 1, 3), 'desc') : list(3, 2, 1)
sort(list('b', 'a', 'c'))) : list('a', 'b', 'c')

split()

Purpose

Splits a string on a given character into a list of strings.

Parameters

longString
string to split on

Examples

split('a bc d', ' ') : list('a', 'bc', 'd')
split('aXXbcXXd', 'XX') : list('a', 'bc', 'd')

startsWith()

Purpose

Determines whether a string starts with another string.

Parameters

longString
shortString

Examples

startsWith('abcdefg', 'ab') : true
startsWith('abcdefg', 'cd') : false

store()

Purpose

Stores a value for use later in the pipeline

Returns

true

Parameters

key
value

Examples

store('thing', 1) : true

substring()

Purpose

Retrieves part of a string. If more characters are requested than available at the end of the string, just the available characters are returned.

Parameters

inputString
startIndex
length (optional)

Examples

substring('haystack', 3) : 'stack'
substring('haystack', 0, 3) : 'hay'
substring('haystack', 3, 100) : 'stack'
substring('haystack', 0, 100) : 'haystack'
substring('haystack', 0, 0) : ''

sum()

Purpose

Sums numeric items. Optionally, perform a lambda on each one first.

Parameters

list - the original list
predicate (optional) - a string to represent the value to be evaluated
nCalcString (optional) - the string to evaluate

Examples

sum(list(1, 2, 3)) : 6
sum(list(1, 2, 3), 'n', 'n * n') : 14

switch()

Purpose

Return one of a number of values, depending on the input function.

Parameters

switched value
a set of pairs: case_n, output_n
if present, a final value can be used as a default. If the default WOULD have been returned, but no default is present, an exception is thrown.

Examples

switch('yes', 'yes', 1, 'no', 2) : 1
switch('blah', 'yes', 1, 'no', 2) : throws exception
switch('blah', 'yes', 1, 'no', 2, 3) : 3

take()

Purpose

Takes a number of items from a list.

Notes

If a number is provided that is longer than the list, the full list is returned.

Parameters

the list to take from
the number of items to take

Examples

take(list(1, 2, 3), 2): list(1, 2)
take(list(1, 2, 3), 10): list(1, 2, 3)

throw()

Purpose

Throws an NCalcExtensionsException. Useful in an if().

Parameters

message (optional)

Examples

throw()
throw('This is a message')
if(problem, throw('There is a problem'), 5)

timeSpan()

Purpose

Determines the amount of time between two DateTimes. The following units are supported:

Years
Weeks
Days
Hours
Minutes
Seconds
Milliseconds
Any other string is handled with TimeSpan.ToString(timeUnit). See https://learn.microsoft.com/en-us/dotnet/standard/base-types/standard-timespan-format-strings

Parameters

startDateTime
endDateTime
timeUnit

Examples

timeSpan('2019-01-01 00:01:00', '2019-01-01 00:02:00', 'seconds') : 3600

toDateTime()

Purpose

Converts a string to a UTC DateTime. May take an optional inputTimeZone.

Notes

When using numbers as the first input parameter, provide it as a decimal (see examples, below) to avoid hitting an NCalc bug relating to longs being interpreted as floats.

Parameters

inputString
stringFormat
inputTimeZone (optional) See https://docs.microsoft.com/en-us/dotnet/api/system.timezoneinfo.findsystemtimezonebyid?view=netstandard-2.0

Examples

toDateTime('2019-01-01', 'yyyy-MM-dd') : A date time representing 2019-01-01
toDateTime('2020-02-29 12:00', 'yyyy-MM-dd HH:mm', 'Eastern Standard Time') : A date time representing 2020-02-29 17:00:00 UTC
toDateTime('2020-03-13 12:00', 'yyyy-MM-dd HH:mm', 'Eastern Standard Time') : A date time representing 2020-03-13 16:00:00 UTC
toDateTime(161827200.0, 's', 'UTC') : A date time representing 1975-02-17 00:00:00 UTC
toDateTime(156816000000.0, 'ms', 'UTC') : A date time representing 1974-12-21 00:00:00 UTC
toDateTime(156816000000000.0, 'us', 'UTC') : A date time representing 1974-12-21 00:00:00 UTC

toLower()

Purpose

Converts a string to lower case.

Parameters

string

Examples

toLower('PaNToMIMe') : 'pantomime'

toString()

Purpose

Converts any object to a string

Parameters

object
format (optional)

Examples

toString(1) : '1'
toString(1000, 'N2') : '1,000.00'
toString(DateTimeOffset, 'yyyy-MM-dd') : '2023-02-17'

toUpper()

Purpose

Converts a string to upper case.

Parameters

string

Examples

toUpper('PaNToMIMe') : 'PANTOMIME'

try()

Purpose

If a function throws an exception, return an alternate value.

Parameters

function to attempt
result to return if an exception is thrown (null is returned if this parameter is omitted and an exception is thrown)

Examples

try(1, 'Failed') : 1
try(throw('Woo')) : null
try(throw('Woo'), 'Failed') : 'Failed'
try(throw('Woo'), exception_message) : 'Woo'
try(throw('Woo'), exception_type) : typeof(PanoramicData.NCalcExtensions.Exceptions.NCalcExtensionsException)
try(throw('Woo'), exception_typeFullName) : 'PanoramicData.NCalcExtensions.Exceptions.NCalcExtensionsException'
try(throw('Woo'), exception_typeName) : 'NCalcExtensionsException'
try(throw('Woo'), exception) : The Exception object thrown by the throw function.

tryParse()

Purpose

Returns a boolean result of an attempted cast.

Parameters

type
value
key - for use with the retrieve() function

Examples

tryParse('int', '1', 'outputVariable') : true
tryParse('int', 'string', 'outputVariable') : false

typeOf()

Purpose

Determines the C# type of the object.

Parameters

parameter

Examples

typeOf('text') : 'String'
typeOf(1) : 'Int32'
typeOf(1.1) : 'Double'
typeOf(null) : null

where()

Purpose

Filters an IEnumerable to bring back only those items that match a condition.

Parameters

list - the original list
predicate - a string to represent the value to be evaluated
nCalcString - the string to evaluate

Examples

where(list(1, 2, 3, 4, 5), 'n', 'n < 3') : list(1, 2)
where(list(1, 2, 3, 4, 5), 'n', 'n < 3 || n > 4') : list(1, 2, 5)

Name		Name	Last commit message	Last commit date
Latest commit History 287 Commits
.github/workflows		.github/workflows
.vs/SwitchStartupProject		.vs/SwitchStartupProject
PanoramicData.NCalcExtensions.Test		PanoramicData.NCalcExtensions.Test
PanoramicData.NCalcExtensions		PanoramicData.NCalcExtensions
.editorconfig		.editorconfig
.gitignore		.gitignore
LICENSE		LICENSE
PanoramicData.NCalcExtensions.sln		PanoramicData.NCalcExtensions.sln
PanoramicData.NCalcExtensions.sln.vsspell.dic		PanoramicData.NCalcExtensions.sln.vsspell.dic
README.md		README.md
SECURITY.md		SECURITY.md
global.json		global.json
version.json		version.json

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panoramicdata/PanoramicData.NCalcExtensions

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PanoramicData.NCalcExtensions

Introduction

Functions

Usage

Namespace safety

Contributing

Function documentation

all()

Purpose

Parameters

Examples

any()

Purpose

Parameters

Examples

canEvaluate()

Purpose

Parameters

Examples

capitalize()

Purpose

Parameters

Examples

cast()

Purpose

Notes

Parameters

Examples

changeTimeZone()

Purpose

Notes

Parameters

Examples

concat()

Purpose

Notes

Parameters

Examples

contains()

Purpose

Parameters

Examples

convert()

Purpose

Notes

Parameters

Examples

count()

Purpose

Parameters

Examples

countBy()

Purpose

Parameters

Examples

dateAdd()

Purpose

Parameters

Examples

dateTime()

Purpose

Parameters

Examples

dateTimeAsEpoch()

Purpose

Parameters

Examples

dateTimeAsEpochMs()

Purpose

Parameters

Examples

dictionary()

Purpose

Parameters