@writetome51/get-index-for-reversed-array

getIndexForReversedArray(
      index,
      arrayLength
): number

Receives array index and returns the new index that same item would have
if the array's order were reversed.

Examples

let arr = ['a', 'b', 'c', 'd', 'e'];   
let index = arr.indexOf('d');
arr.reverse();
getIndexForReversedArray(index, arr.length);
   // -->  1

arr = [7, 2, 6, 9, 3, 10];
let index = arr.indexOf(2);
arr.reverse();
getIndexForReversedArray(index, arr.length);
   // -->  2

Installation

npm i @writetome51/get-index-for-reversed-array

Loading

import {getIndexForReversedArray} from '@writetome51/get-index-for-reversed-array';