Run results for: Object.assign vs prototype

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36

Browser: Chrome 63

Operating system: Linux

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Extend prototype	62.0 Ops/sec
Object.assign	62.4 Ops/sec

Tests:

Extend prototype
String.prototype.toBinary = function () { let output = ''; for (let i = 0; i < this.length; i++) { output += this[i].charCodeAt(0).toString(2) + " "; } return output; } String.prototype.toHex = function () { let output = ''; for (let i = 0; i < this.length; i++) { output += this[i].charCodeAt(0).toString(8) + " "; } return output; } for (let i = 0; i < 1000; i++) { let t = new String("test"); console.log(t.toString(), t.toBinary(), t.toHex()); }
Object.assign
Object.assign(String, { toBinary() { let output = ''; for (let i = 0; i < this.length; i++) { output += this[i].charCodeAt(0).toString(2) + " "; } return output; }, toHex() { let output = ''; for (let i = 0; i < this.length; i++) { output += this[i].charCodeAt(0).toString(8) + " "; } return output; } }); for (let i = 0; i < 1000; i++) { let t = new String("test"); console.log(t.toString(), t.toBinary(), t.toHex()); }