JSFiddle - React, Tailwind, and code Playground

JavaScript

let firstArray = [1, 2, 3, 4, 5];
let secondArray = [6, 7, 8, 9, 10];

let sum = firstArray + secondArray;

for (let i = sum [4]; i < sum.length; i++) { 
	delete firstArray[i];
}

let result = console.log(console.log()) === firstArray[5];

alert(+result + firstArray.length + secondArray.length + sum.length);