var a = [{a:1}, {a:1}, {a:1}] var b = a.filter(o => o.a === 1)

if(a[0] === b[0]) { console.log(1) }

if(a === b) { console.log(2) }

if(a[0].a === b[1].a) { console.log(3) }

function a() { console.log(this) }

console.log(a()) console.log(new a())

var cls1 = function(){}; cls1.prototype.method = function(val) {  return val*val; }

var cls2 = function() {   this.method = function(val) {   return val*val; } }

var instance1 = new cls1(); var instance2 = new cls2();

new Promise((resolve) => { resolve(); console.log(1); }).then(() => console.log(4))

setTimeout(() => console.log(2)) console.log(3)

const closure = { a: {abc: 1}, b: function() { adsaslkj; } }

function closure() { const a;

}