İngilizceden çevrildi
var foo = ['a', 'ab', 'abc'];var bar = foo.map(f => f.length);console.log(bar); // 1,2,3// < ES6:var foo = ['a', 'ab', 'abc'];var bar = foo.map(function(f) { return f.length;});console.log(bar); // 1,2,3thisfunction Foo() { this.name = name; this.count = 0; this.startCounting();}Foo.prototype.startCounting = function() { var self = this; setInterval(function() { // this is the Window, not Foo {}, as you might expect console.log(this); // [object Window] // that's why we reassign this to self before setInterval() console.log(self.count); self.count++; }, 1000)}new Foo();function Foo() { this.name = name; this.count = 0; this.startCounting();}Foo.prototype.startCounting = function() { setInterval(() => { console.log(this); // [object Object] console.log(this.count); // 1, 2, 3 this.count++; }, 1000)}new Foo();