Message from JavaScript discussions

November 2018

—

var test = function() {
    this.a = (function(me) {
        return function() {
            return me;
        }
    })(this);;
    this.b = (() => this);
};

var test = new test();
var a = test.a;
var b = test.b;

if (test.a() === b() && test.b() === a() && a() === b()) {
    console.log('It is bound!!!!!!!!!!!');
}

Message permanent page

—

Language:

js

Source:

var test = function() {
    this.a = (function(me) {
        return function() {
            return me;
        }
    })(this);;
    this.b = (() => this);
};

var test = new test();
var a = test.a;
var b = test.b;

if (test.a() === b() && test.b() ===

Errors:

source_file.js:15
});
^

SyntaxError: Unexpected token }
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:374:25)
    at Object.Module._extensions..js (module.js:417:10)
    at Module.load (module.js:344:32)
    at Function.Module._load (module.js:301:12)
    at Function.Module.runMain (module.js:442:10)
    at startup (node.js:136:18)
    at node.js:966:3

— 🤣

— Https://jsperf.com/normal-bound-vs-arrow-create-speed/1

— So what's the problem?

— Afs have lexical this

— Js is not intepreted

— Is compiled

— Af are bound at lexical time

— For more information, study you don't know js series 😃

— Terminology is a problem

— Https://github.com/getify/You-Dont-Know-JS