JSFiddle - React, Tailwind, and code Playground

JavaScript

var Animal = {
    //name:"toto",
    getName : function(){return this.name;},
    setName : function(name){this.name=name;}
};
var Chien = Object.create(Animal);
var medor = Object.create(Chien);
var own = Chien.hasOwnProperty('name');
   document.write("own " + own + " <br/>")

 document.write("OK<br/>")
    var c=1000000;
    var loup = [];
    var i;
    for(i=0; i<c; i++){
        loup[i] = Object.create(Chien);
        loup[i].name = "toto";

    }
    var tstart = 0;
    var tend = 0;
    tstart = new Date().getTime();
    for(i=0; i<c; i++){
        loup[i].setName("titi");
        loup[i].getName();
    }
    tend = new Date().getTime() - tstart;
    document.write("tempo loup " + tend / 1000.0 + " seconds<br/>")
    document.write("nom="+loup[0].getName()+"<br/>")