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Unique pairs in array that forms palindrome words in JavaScript
Problem
We are required to write a JavaScript function that takes in an array of unique words.
Our function should return an array of all such index pairs, the words at which, when combined yield a palindrome word.
Example
Following is the code −
const arr = ["abcd", "dcba", "lls", "s", "sssll"]; const findPairs = (arr = []) => { const res = []; for ( let i = 0; i < arr.length; i++ ){ for ( let j = 0; j < arr.length; j++ ){ if (i !== j ) { let k = `${arr[i]}${arr[j]}`; let l = [...k].reverse().join(''); if (k === l) res.push( [i, j] ); } }; }; return res; }; console.log(findPairs(arr));
Output
[ [ 0, 1 ], [ 1, 0 ], [ 2, 4 ], [ 3, 2 ] ]
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