Checks if a string has required substrings after given sums.
https://github.com/pelevesque/has_prohibited_substring_after_sums
https://github.com/pelevesque/has_required_substrings
https://github.com/pelevesque/has_prohibited_substring
https://github.com/pelevesque/has_required_substrings_at_indexes
https://github.com/pelevesque/has_prohibited_substring_at_indexes
https://www.npmjs.com/package/@pelevesque/has_required_substrings_after_sums
npm install @pelevesque/has_required_substrings_after_sums
npm test
npm run cover
str (required)
requiredSubstrings (required)
options (optional) default = { substringsToDigits = null, sumPlainDigits = true, allowLastSubstringToBleed = false, ignoreSumsOutsideString = false }
const hasRequiredSubstringsAfterSums = require('@pelevesque/has_required_substrings_after_sums')
@see https://github.com/pelevesque/sum-digits to understand how the sum is calculated.
requiredSubstrings
is an object of sum -> substring pairs. true
is returned
if all substrings are found after their associated sums but before the following sums.
const str = '123a45'
const requiredSubstrings = { 1: 'a' }
const result = hasRequiredSubstringsAfterSums(str, requiredSubstrings)
// result === false
const str = '123a45'
const requiredSubstrings = { 6: 'a' }
const result = hasRequiredSubstringsAfterSums(str, requiredSubstrings)
// result === true
const str = '123bca45'
const requiredSubstrings = { 6: 'a' }
const result = hasRequiredSubstringsAfterSums(str, requiredSubstrings)
// result === true
const str = '123man45adinosaur'
const requiredSubstrings = { 6: 'man', 15: 'dinosaur' }
const result = hasRequiredSubstringsAfterSums(str, requiredSubstrings)
// result === true
You can use the substringsToDigits
option to give numeric values to substrings
so that they are counted during summing.
const str = '123!$$$a'
const requiredSubstrings = { 15: 'a' }
const substringsToDigits = { '!': 4, '$$$': 5 }
const result = hasRequiredSubstringsAfterSums(str, requiredSubstrings, {
substringsToDigits: substringsToDigits
})
// result === true
You can set the sumPlainDigits
option to false if you only want to sum
substringsToDigits
.
In the following example, 1
, 2
, and 3
are not summed.
const str = '123!a'
const requiredSubstrings = { 4: 'a' }
const substringsToDigits = { '!': 4 }
const sumPlainDigits = false
const result = hasRequiredSubstringsAfterSums(str, requiredSubstrings, {
substringsToDigits: substringsToDigits,
sumPlainDigits: sumPlainDigits
})
// result === true
The allowLastSubstringToBleed
option is false
by default. It it used when you want
to allow the last substring to be incomplete if the string is too short.
In the following example, the last substring canal
starts at the correct index,
but remains incomplete since the string ends. Normally this would return false
.
With allowLastSubstringToBleed
set to true
, it returns true
.
const str = '123can'
const requiredSubstrings = { 6: 'canal' }
const allowLastSubstringToBleed = true
const result = hasRequiredSubstringsAfterSums(str, requiredSubstrings, {
allowLastSubstringToBleed: allowLastSubstringToBleed
})
// result === true
The ignoreSumsOutsideString
option is false
by default. When set to true
,
required substring sums that fall outside the string sums will be ignored.
const str = '123a'
const requiredSubstrings = { 100: 'tree', 150: 'fig' }
const ignoreSumsOutsideString = true
const result = hasRequiredSubstringsAfterSums(str, requiredSubstrings, {
ignoreSumsOutsideString: ignoreSumsOutsideString
})
// result === true