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String manipulation helpers for javascript
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dist release 3.0.3
helper fix succ/pred for a empty string
test add some more tests for capitalize
.editorconfig add editorconfig to ensure file formating
.gitignore Drop gitignore on dist
.npmignore allow the whole `dist/` to appear in the npm package
.travis.yml add iojs to travis
CHANGELOG.markdown release 3.0.3
CONTRIBUTING.markdown Drop gitignore on dist
README.markdown Add flag to capitalize to lowercase characters
bower.json release 3.0.3
camelize.js add force lowercase flag to camelize
capitalize.js Add flag to capitalize to lowercase characters
chars.js move functions to commonjs modules
chop.js move functions to commonjs modules
classify.js fix classify
clean.js move functions to commonjs modules
component.json release 3.0.3
count.js fix count infinite loop
dasherize.js move functions to commonjs modules
decapitalize.js move functions to commonjs modules
dedent.js add dedent function
endsWith.js move functions to commonjs modules
escapeHTML.js move functions to commonjs modules
exports.js Made join a conflict method to fix #174.
gulpfile.js Meteor integration
humanize.js trim before capitalize in humanize
include.js move functions to commonjs modules
index.js release 3.0.3
insert.js move functions to commonjs modules
isBlank.js move functions to commonjs modules
join.js move functions to commonjs modules
levenshtein.js move functions to commonjs modules
lines.js Handle carriage returns in lines()
lpad.js move functions to commonjs modules
lrpad.js move functions to commonjs modules
ltrim.js move functions to commonjs modules
naturalCmp.js move functions to commonjs modules
numberFormat.js move functions to commonjs modules
package.js Meteor integration
package.json add iojs to travis
pad.js move functions to commonjs modules
pred.js add missing predecessor function
prune.js move functions to commonjs modules
quote.js move functions to commonjs modules
repeat.js move functions to commonjs modules
replaceAll.js add replaceAll
reverse.js move functions to commonjs modules
rpad.js move functions to commonjs modules
rtrim.js move functions to commonjs modules
slugify.js move functions to commonjs modules
splice.js move functions to commonjs modules
sprintf.js move functions to commonjs modules
startsWith.js fix edgecase of startsWith
strLeft.js move functions to commonjs modules
strLeftBack.js move functions to commonjs modules
strRight.js move functions to commonjs modules
strRightBack.js move functions to commonjs modules
stripTags.js move functions to commonjs modules
succ.js add missing predecessor function
surround.js move functions to commonjs modules
swapCase.js move functions to commonjs modules
titleize.js move functions to commonjs modules
toBoolean.js move functions to commonjs modules
toNumber.js Fixes #329; Allow negative decimal precision
toSentence.js move functions to commonjs modules
toSentenceSerial.js move functions to commonjs modules
trim.js move functions to commonjs modules
truncate.js move functions to commonjs modules
underscored.js move functions to commonjs modules
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unquote.js move functions to commonjs modules
vsprintf.js move functions to commonjs modules
words.js move functions to commonjs modules

README.markdown

The stable release documentation can be found here https://epeli.github.io/underscore.string/

Underscore.string Build Status

Javascript lacks complete string manipulation operations. This an attempt to fill that gap. List of build-in methods can be found for example from Dive Into JavaScript. Originally started as an Underscore.js extension but is a full standalone library nowadays.

Upgrading from 2.x to 3.x? Please read the changelog.

Usage

In Node.js and Browserify

Install from npm

npm install underscore.string

Require individual functions

var slugify = require("underscore.string/slugify");

slugify("Hello world!");
// => hello-world

or load the full library to enable chaining

var s = require("underscore.string");

s("   epeli  ").trim().capitalize().value();
// => "Epeli"

but especially when using with Browserify the individual function approach is recommended because using it you only add those functions to your bundle you use.

In Meteor

From your Meteor project folder

    meteor add underscorestring:underscore.string

and you'll be able to access the library with the s global from both the server and the client.

s.slugify("Hello world!");
// => hello-world

s("   epeli  ").trim().capitalize().value();
// => "Epeli"

Others

The dist/underscore.string.js file is an UMD build. You can load it using an AMD loader such as RequireJS or just stick it to a web page and access the library from the s global.

Underscore.js/Lo-Dash integration

It is still possible use as Underscore.js/Lo-Dash extension

_.mixin(s.exports());

But it's not recommended since include, contains, reverse and join are dropped because they collide with the functions already defined by Underscore.js.

Lo-Dash-FP/Ramda integration

If you want to use underscore.string with ramdajs or Lo-Dash-FP you can use underscore.string.fp.

npm install underscore.string.fp
var S = require('underscore.string.fp');
var filter = require('lodash-fp').filter;
var filter = require('ramda').filter;

filter(S.startsWith('.'), [
  '.vimrc',
  'foo.md',
  '.zshrc'
]);
// => ['.vimrc', '.zshrc']

Download

API

Individual functions

numberFormat(number, [ decimals=0, decimalSeparator='.', orderSeparator=',']) => string

Formats the numbers.

numberFormat(1000, 2);
// => "1,000.00"

numberFormat(123456789.123, 5, ".", ",");
// => "123,456,789.12300"

levenshtein(string1, string2) => number

Calculates Levenshtein distance between two strings.

levenshtein("kitten", "kittah");
// => 2

capitalize(string, [lowercaseRest=false]) => string

Converts first letter of the string to uppercase. If true is passed as second argument the rest of the string will be converted to lower case.

capitalize("foo Bar");
// => "Foo Bar"

capitalize("FOO Bar", true);
// => "Foo bar"

decapitalize(string) => string

Converts first letter of the string to lowercase.

decapitalize("Foo Bar");
// => "foo Bar"

chop(string, step) => array

chop("whitespace", 3);
// => ["whi", "tes", "pac", "e"]

clean(string) => string

Trim and replace multiple spaces with a single space.

clean(" foo    bar   ");
// => "foo bar"

chars(string) => array

chars("Hello");
// => ["H", "e", "l", "l", "o"]

swapCase(string) => string

Returns a copy of the string in which all the case-based characters have had their case swapped.

swapCase("hELLO");
// => "Hello"

include(string, substring) => boolean

Tests if string contains a substring.

include("foobar", "ob");
// => true

count(string, substring) => number

count("Hello world", "l");
// => 3

escapeHTML(string) => string

Converts HTML special characters to their entity equivalents.

escapeHTML("<div>Blah blah blah</div>");
// => "&lt;div&gt;Blah blah blah&lt;/div&gt;"

unescapeHTML(string) => string

Converts entity characters to HTML equivalents.

unescapeHTML("&lt;div&gt;Blah blah blah&lt;/div&gt;");
// => "<div>Blah blah blah</div>"

insert(string, index, substring) => string

insert("Hello ", 6, "world");
// => "Hello world"

replaceAll(string, find, replace, [ignorecase=false]) => string

replaceAll("foo", "o", "a");
// => "faa"

isBlank(string) => boolean

isBlank(""); // => true
isBlank("\n"); // => true
isBlank(" "); // => true
isBlank("a"); // => false

join(separator, ...strings) => string

Joins strings together with given separator

join(" ", "foo", "bar");
// => "foo bar"

lines(str) => array

Split lines to an array

lines("Hello\nWorld");
// => ["Hello", "World"]

dedent(str, [pattern]) => string

Dedent unnecessary indentation or dedent by a pattern.

Credits go to @sindresorhus. This implementation is similar to https://github.com/sindresorhus/strip-indent

dedent("  Hello\n    World");
// => "Hello\n  World"

dedent("\t\tHello\n\t\t\t\tWorld");
// => "Hello\n\t\tWorld"

dedent("    Hello\n    World", "  "); // Dedent by 2 spaces
// => "  Hello\n  World"

reverse(string) => string

Return reversed string:

reverse("foobar");
// => "raboof"

splice(string, index, howmany, substring) => string

Like an array splice.

splice("https://edtsech@bitbucket.org/edtsech/underscore.strings", 30, 7, "epeli");
// => "https://edtsech@bitbucket.org/epeli/underscore.strings"

startsWith(string, starts, [position]) => boolean

This method checks whether the string begins with starts at position (default: 0).

startsWith("image.gif", "image");
// => true

startsWith(".vimrc", "vim", 1);
// => true

endsWith(string, ends, [position]) => boolean

This method checks whether the string ends with ends at position (default: string.length).

endsWith("image.gif", "gif");
// => true

endsWith("image.old.gif", "old", 9);
// => true

pred(string) => string

Returns the predecessor to str.

pred("b");
// => "a"

pred("B");
// => "A"

succ(string) => string

Returns the successor to str.

succ("a");
// => "b"

succ("A");
// => "B"

titleize(string) => string

titleize("my name is epeli");
// => "My Name Is Epeli"

camelize(string, [decapitalize=false]) => string

Converts underscored or dasherized string to a camelized one. Begins with a lower case letter unless it starts with an underscore, dash or an upper case letter.

camelize("moz-transform");
// => "mozTransform"

camelize("-moz-transform");
// => "MozTransform"

camelize("_moz_transform");
// => "MozTransform"

camelize("Moz-transform");
// => "MozTransform"

camelize("-moz-transform", true);
// => "mozTransform"

classify(string) => string

Converts string to camelized class name. First letter is always upper case

classify("some_class_name");
// => "SomeClassName"

underscored(string) => string

Converts a camelized or dasherized string into an underscored one

underscored("MozTransform");
// => "moz_transform"

dasherize(string) => string

Converts a underscored or camelized string into an dasherized one

dasherize("MozTransform");
// => "-moz-transform"

humanize(string) => string

Converts an underscored, camelized, or dasherized string into a humanized one. Also removes beginning and ending whitespace, and removes the postfix '_id'.

humanize("  capitalize dash-CamelCase_underscore trim  ");
// => "Capitalize dash camel case underscore trim"

trim(string, [characters]) => string

Trims defined characters from begining and ending of the string. Defaults to whitespace characters.

trim("  foobar   ");
// => "foobar"

trim("_-foobar-_", "_-");
// => "foobar"

ltrim(string, [characters]) => string

Left trim. Similar to trim, but only for left side.

rtrim(string, [characters]) => string

Right trim. Similar to trim, but only for right side.

truncate(string, length, truncateString) => string

truncate("Hello world", 5);
// => "Hello..."

truncate("Hello", 10);
// => "Hello"

prune(string, length, pruneString) => string

Elegant version of truncate. Makes sure the pruned string does not exceed the original length. Avoid half-chopped words when truncating.

prune("Hello, world", 5);
// => "Hello..."

prune("Hello, world", 8);
// => "Hello..."

prune("Hello, world", 5, " (read a lot more)");
// => "Hello, world" (as adding "(read a lot more)" would be longer than the original string)

prune("Hello, cruel world", 15);
// => "Hello, cruel..."

prune("Hello", 10);
// => "Hello"

words(str, delimiter=/\s+/) => array

Split string by delimiter (String or RegExp), /\s+/ by default.

words("   I   love   you   ");
// => ["I", "love", "you"]

words("I_love_you", "_");
// => ["I", "love", "you"]

words("I-love-you", /-/);
// => ["I", "love", "you"]

words("   ")
// => []

sprintf(string format, ...arguments) => string

C like string formatting. Credits goes to Alexandru Marasteanu. For more detailed documentation, see the original page.

sprintf("%.1f", 1.17);
// => "1.2"

pad(str, length, [padStr, type]) => string

pads the str with characters until the total string length is equal to the passed length parameter. By default, pads on the left with the space char (" "). padStr is truncated to a single character if necessary.

pad("1", 8);
// => "       1"

pad("1", 8, "0");
// => "00000001"

pad("1", 8, "0", "right");
// => "10000000"

pad("1", 8, "0", "both");
// => "00001000"

pad("1", 8, "bleepblorp", "both");
// => "bbbb1bbb"

lpad(str, length, [padStr]) => string

left-pad a string. Alias for pad(str, length, padStr, "left")

lpad("1", 8, "0");
// => "00000001"

rpad(str, length, [padStr]) => string

right-pad a string. Alias for pad(str, length, padStr, "right")

rpad("1", 8, "0");
// => "10000000"

lrpad(str, length, [padStr]) => string

left/right-pad a string. Alias for pad(str, length, padStr, "both")

lrpad("1", 8, '0');
// => "00001000"

toNumber(string, [decimals]) => number

Parse string to number. Returns NaN if string can't be parsed to number.

toNumber("2.556");
// => 3

toNumber("2.556", 1);
// => 2.6

toNumber("999.999", -1);
// => 990

strRight(string, pattern) => string

Searches a string from left to right for a pattern and returns a substring consisting of the characters in the string that are to the right of the pattern or all string if no match found.

strRight("This_is_a_test_string", "_");
// => "is_a_test_string"

strRightBack(string, pattern) => string

Searches a string from right to left for a pattern and returns a substring consisting of the characters in the string that are to the right of the pattern or all string if no match found.

strRightBack("This_is_a_test_string", "_");
// => "string"

strLeft(string, pattern) => string

Searches a string from left to right for a pattern and returns a substring consisting of the characters in the string that are to the left of the pattern or all string if no match found.

strLeft("This_is_a_test_string", "_");
// => "This";

strLeftBack(string, pattern) => string

Searches a string from right to left for a pattern and returns a substring consisting of the characters in the string that are to the left of the pattern or all string if no match found.

strLeftBack("This_is_a_test_string", "_");
// => "This_is_a_test";

stripTags(string) => string

Removes all html tags from string.

stripTags("a <a href="#">link</a>");
// => "a link"

stripTags("a <a href="#">link</a><script>alert("hello world!")</script>");
// => "a linkalert("hello world!")"

toSentence(array, [delimiter, lastDelimiter]) => string

Join an array into a human readable sentence.

toSentence(["jQuery", "Mootools", "Prototype"]);
// => "jQuery, Mootools and Prototype";

toSentence(["jQuery", "Mootools", "Prototype"], ", ", " unt ');
// => "jQuery, Mootools unt Prototype";

toSentenceSerial(array, [delimiter, lastDelimiter]) => string

The same as toSentence, but adjusts delimeters to use Serial comma.

toSentenceSerial(["jQuery", "Mootools"]);
// => "jQuery and Mootools"

toSentenceSerial(["jQuery", "Mootools", "Prototype"]);
// => "jQuery, Mootools, and Prototype"

toSentenceSerial(["jQuery", "Mootools", "Prototype"], ", ", " unt ');
// => "jQuery, Mootools, unt Prototype"

repeat(string, count, [separator]) => string

Repeats a string count times.

repeat("foo", 3);
// => "foofoofoo"

repeat("foo", 3, "bar");
// => "foobarfoobarfoo"

surround(string, wrap) => string

Surround a string with another string.

surround("foo", "ab");
// => "abfooab"

quote(string, quoteChar) or q(string, quoteChar) => string

Quotes a string. quoteChar defaults to ".

quote("foo", '"');
// => '"foo"';

unquote(string, quoteChar) => string

Unquotes a string. quoteChar defaults to ".

unquote('"foo"');
// => "foo"

unquote("'foo'", "'");
// => "foo"

slugify(string) => string

Transform text into an ascii slug which can be used in safely in URLs. Replaces whitespaces, accentuated, and special characters with a dash. Limited set of non-ascii characters are transformed to similar versions in the ascii character set such as ä to a.

slugify("Un éléphant à l\'orée du bois");
// => "un-elephant-a-l-oree-du-bois"

Caution: this function is charset dependent

naturalCmp(string1, string2) => number

Naturally sort strings like humans would do. None numbers are compared by their ASCII values. Note: this means "a" > "A". Use .toLowerCase if this isn't to be desired.

Just past it to Array#sort.

["foo20", "foo5"].sort(naturalCmp);
// => ["foo5", "foo20"]

toBoolean(string) => boolean

Turn strings that can be commonly considered as booleas to real booleans. Such as "true", "false", "1" and "0". This function is case insensitive.

toBoolean("true");
// => true

toBoolean("FALSE");
// => false

toBoolean("random");
// => undefined

It can be customized by giving arrays of truth and falsy value matcher as parameters. Matchers can be also RegExp objects.

toBoolean("truthy", ["truthy"], ["falsy"]);
// => true

toBoolean("true only at start", [/^true/]);
// => true

Library functions

If you require the full library you can use chaining and aliases

s(string) => chain

Start a chain. Returns an immutable chain object with the string functions as methods which return a new chain object instead of the plain string value.

The chain object includes also following native Javascript string methods:

chain.value()

Return the string value from the chain

s("  foo  ").trim().capitalize().value();
// => "Foo"

When calling a method which does not return a string the resulting value is immediately returned

s(" foobar ").trim().startsWith("foo");
// => true

chain.tap(function) => chain

Tap into the chain with a custom function

s("foo").tap(function(value){
  return value + "bar";
}).value();
// => "foobar"

Aliases

strip     = trim
lstrip    = ltrim
rstrip    = rtrim
center    = lrpad
rjust     = lpad
ljust     = rpad
contains  = include
q         = quote
toBool    = toBoolean
camelcase = camelize

Maintainers

This library is maintained by

Licence

The MIT License

Copyright (c) 2011 Esa-Matti Suuronen esa-matti@suuronen.org

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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