Benchmark: Object.assign vs prototype

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()); }

Rendered benchmark preparation results:

Previous results

Test case name	Result
Extend prototype
Object.assign

ⓘ Get performance results from real users on your website with Request Metrics.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:71.0) Gecko/20100101 Firefox/71.0

Browser/OS: Firefox 71 on Linux

Test name	Executions per second
Extend prototype	61.0 Ops/sec
Object.assign	65.2 Ops/sec

Object.assign vs prototype (version: 0)