has_required_substrings_at_indexes

Checks if a string has required substrings at given indexes.

Related Packages

https://github.com/pelevesque/has_prohibited_substring_at_indexes
https://github.com/pelevesque/has_required_substrings
https://github.com/pelevesque/has_prohibited_substring
https://github.com/pelevesque/has_required_substrings_after_sums
https://github.com/pelevesque/has_prohibited_substring_after_sums

Node Repository

https://www.npmjs.com/package/@pelevesque/has_required_substrings_at_indexes

Installation

npm install @pelevesque/has_required_substrings_at_indexes

Tests

Standard Style & Unit Tests

npm test

Unit Tests & Coverage

npm run cover

Usage

Parameters

str                (required)
requiredSubstrings (required)
options            (optional) default = { allowLastSubstringToBleed = false, ignoreSubstringsOutsideString = false }

Requiring

const hasRequiredSubstringsAtIndexes = require('@pelevesque/has_required_substrings_at_indexes')

Basic Usage

requiredSubstrings is an object of index -> substring pairs. true is returned if all substrings are found at the correct indexes.

const str = 'abcde'
const requiredSubstrings = { 0: 'f' }
const result = hasRequiredSubstringsAtIndexes(str, requiredSubstrings)
// result === false

const str = 'abcde'
const requiredSubstrings = { 5: 'f' }
const result = hasRequiredSubstringsAtIndexes(str, requiredSubstrings)
// result === false

const str = 'abcde'
const requiredSubstrings = { 0: 'a', 2: 'c', 4: 'a' }
const result = hasRequiredSubstringsAtIndexes(str, requiredSubstrings)
// result === false

const str = 'abcde'
const requiredSubstrings = { 0: 'a', 2: 'c', 4: 'e' }
const result = hasRequiredSubstringsAtIndexes(str, requiredSubstrings)
// result === true

const str = 'a man a plan a canal'
const requiredSubstrings = { 2: 'man', 8: 'plan', 15: 'canal' }
const result = hasRequiredSubstringsAtIndexes(str, requiredSubstrings)
// result === true

Options

allowLastSubstringToBleed

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 = 'a man a plan a c'
const requiredSubstrings = { 2: 'man', 8: 'plan', 15: 'canal' }
const allowLastSubstringToBleed = true
const result = hasRequiredSubstringsAtIndexes(str, requiredSubstrings, {
  allowLastSubstringToBleed: allowLastSubstringToBleed
})
// result === true

ignoreIndexesOutsideString

The ignoreIndexesOutsideString option is false by default. When set to true, required substring indexes that fall outside the string length will be ignored.

const str = 'abcde'
const requiredSubstrings = { 5: 'f' }
const ignoreIndexesOutsideString = true
const result = hasRequiredSubstringsAtIndexes(str, requiredSubstrings, {
  ignoreIndexesOutsideString: ignoreIndexesOutsideString
})
// result === true