JSFiddle - React, Tailwind, and code Playground

by Santosh Giridhara

JavaScript

var nums = [4,3,1,0];
var missingNumber = function(nums) {
    let sum = 0;
    let expectedSum = nums.length;
    for (var i = 0; i < nums.length; i++) {
        sum += nums[i];
        expectedSum += i;
    }
    
    return expectedSum - sum;
};
alert(missingNumber(nums));