Finding Unique String in an Array in JavaScript

Suppose, we have the following array of strings that might contain duplicate characters −

const arr = ['54gdgdfe3', '434ffd', '43frdf', '43fdhnh', 'wgcxhjny', 'fsdf34'];

We are required to write a JavaScript function that takes in one such array and returns the very first element from the array that contains 0 duplicate characters.

If there does not exist any such string, we should return false.

Example

Following is the code −

const arr = ['54gdgdfe3', '434ffd', '43frdf', '43fdhnh', 'wgcxhjny', 'fsdf34']; const isUnique = str => {    return str.split('').every(el => str.indexOf(el) ===    str.lastIndexOf(el)); }; const findUniqueString = arr => {    for(let i = 0; i < arr.length; i++){       if(isUnique(arr[i])){          return arr[i];       };    };    return false; }; console.log(findUniqueString(arr));

Output

Following is the output in the console −

wgcxhjny