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performance comparison of creating bound functions
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const assert = require('assert') | |
console.log('NODE:', process.version) | |
console.log('V8:', process.versions.v8, '\n--------------') | |
class Bind { | |
constructor () { | |
this.value = 1000 | |
this.update = this.__update.bind(this) | |
} | |
__update () { | |
this.value++ | |
} | |
} | |
class Arrow { | |
constructor () { | |
this.value = 1000 | |
this.update = () => this.__update() | |
} | |
__update () { | |
this.value++ | |
} | |
} | |
function test (source) { | |
assert.strictEqual(source.value, 1000) | |
source.update.call(null) | |
assert.strictEqual(source.value, 1001) | |
} | |
function perf (func) { | |
const start = Date.now() | |
for (var i = 0; i < 10000000; ++i) { | |
func() | |
} | |
return Date.now() - start | |
} | |
function perfCtor (name, Ctor) { | |
const c = new Ctor() | |
const update = c.update | |
console.log(`${name}():new`, perf(function newTester () { | |
const update = new Ctor().update | |
update() | |
})) | |
console.log(`${name}:`, perf(function tester () { | |
update() | |
})) | |
} | |
test(new Bind()) | |
test(new Arrow()) | |
perfCtor('Arrow', Arrow) | |
perfCtor('Bind', Bind) | |
/* results | |
➜ temp node Javascript.js | |
NODE: v6.8.1 | |
V8: 5.1.281.84 | |
-------------- | |
Arrow():new 3234 | |
Arrow: 69 | |
Bind():new 3211 | |
Bind: 131 | |
➜ temp nvm use 7 | |
Now using node v7.0.0 (npm v3.10.8) | |
➜ temp node Javascript.js | |
NODE: v7.0.0 | |
V8: 5.4.500.36 | |
-------------- | |
Arrow():new 3577 | |
Arrow: 69 | |
Bind():new 683 | |
Bind: 138 | |
*/ |
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Issue filed here.
https://t.co/Dgmu1HEQgQ