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