Syntax error Returning the first number that equals its index in an array using JavaScript

Returning the first number that equals its index in an array using JavaScript

Problem

We are required to write a JavaScript function that takes in an array of number. Our function should return that first number from the array whose value and 0-based index are the same given that there exists at least one such number in the array.

Example

Following is the code −

 Live Demo

const arr = [9, 2, 1, 3, 6, 5];
const findFirstSimilar = (arr = []) => {
   for(let i = 0; i < arr.length; i++){
      const el = arr[i];
      if(el === i){
         return i;
      };
   };
};
console.log(findFirstSimilar(arr));

Output

3
Updated on: 2021-04-20T09:09:37+05:30

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