JSFiddle - React, Tailwind, and code Playground

by Kiwoong Jang

JavaScript

let arr1 = [1, 4, 5, 10, 99, 100];
let arr2 = [4, 5, 90, 100, 120, 130];

let tempArr = [],
	uniqueArr = [];

for(let i of arr1) {
	tempArr[i] = i;
}

for(let i of arr2) {
	if(tempArr[i]) uniqueArr.push(i);
}

console.log(uniqueArr);