getFirstIndexOf(value, array): number
Returns index of first instance of value found in array.
value can be a primitive or array . Returns -1 if value not found.
getLastIndexOf(value, array): number
Returns index of last instance of value found in array.
value can be a primitive or array. Returns -1 if value not found.
getIndexOfPrimitive(
primitive,
array,
startingPosition? = 0
): number
Behaves like Array.indexOf(), except it does strict type-checking on primitive.
Change startingPosition to get something other than the first index.
startingPosition can also be negative to search from the end.
Returns -1 if primitive not found.
getIndexesOf(value, array): number[]
Returns all indexes of value in array.
value can be a primitive or array.
getIndexesThatPass(testFunction, array): number[]
This returns all indexes of array items that pass the testFunction.
testFunction = function(currentValue, currentIndex?, theArray?): boolean
Example:
let arr = ['a', 'boy', 'is', 'playing', 'in', 'the', 'street'];
let stringsLongerThanThree = getIndexesThatPass((value) => value.length > 3, arr);
// stringsLongerThanThree is now [3, 6]
Installation
npm i @writetome51/array-get-indexes
Loading
// if using TypeScript:
import {getFirstIndexOf, getLastIndexOf, getIndexOfPrimitive, getIndexesOf, getIndexesThatPass}
from '@writetome51/array-get-indexes'
// if using ES5 JavaScript:
var getFirstIndexOf = require('@writetome51/array-get-indexes').getFirstIndexOf;
var getLastIndexOf = require('@writetome51/array-get-indexes').getLastIndexOf;
var getIndexOfPrimitive = require('@writetome51/array-get-indexes').getIndexOfPrimitive;
var getIndexesOf = require('@writetome51/array-get-indexes').getIndexesOf;
var getIndexesThatPass = require('@writetome51/array-get-indexes').getIndexesThatPass;