JSFiddle - React, Tailwind, and code Playground

JavaScript

function Animal(){}
    Animal.prototype.getName = function()  {  return this.name;};
    Animal.prototype.setName = function(n) { this.name = n; };
    function Loup(){
         this.name = "toto";
    }
    Loup.prototype = Animal.prototype;

    //Test 1
    var c = 1000000;
    var loups = [];
    var j;
    for (j = 0; j < c; j++) {
        loups[j] = new Loup();
    }

    var tstart = 0;
    var tend = 0;
    tstart = new Date().getTime();
    for (j = 0; j < c; j++) {
        loups[j].setName("tata");
        loups[j].getName();
    }
    if(j=1000000) tend = new Date().getTime() - tstart;
    document.write("tempo " + tend / 1000.0 + " seconds<br/>");