includes_vs_has.js

function shuffle(array) {
    let currentIndex = array.length,  randomIndex;
  
    // While there remain elements to shuffle.
    while (currentIndex != 0) {
  
      // Pick a remaining element.
      randomIndex = Math.floor(Math.random() * currentIndex);
      currentIndex--;
  
      // And swap it with the current element.
      [array[currentIndex], array[randomIndex]] = [
        array[randomIndex], array[currentIndex]];
    }
  
    return array;
}
let arr = [];
let max = 1000000;
for(let i = 0; i < max; i++){
  arr.push(i);
}
shuffle(arr);
let set = new Set(arr);

console.time("arr.includes");
for(let i = 0; i < max;i++){
	arr.indexOf(i);
}
console.timeEnd("arr.includes");

console.time("set.has");
for(let i = 0; i < max;i++){
	set.has(i);
}
console.timeEnd("set.has");