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Detecting the first non-repeating string in Array in JavaScript
Suppose, we have an array of strings like this where strings 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.
Therefore, let’s write the code for this function −
Example
The code for this will be −
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
The output in the console will be −
wgcxhjny
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