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JavaScriptで、メソッドへの参照を変数にキャッシュしてみる
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function Person(name) { | |
this.name = name; | |
} | |
Person.prototype.getHelloString = function(toName, greet) { | |
this.name + ":" + toName + "さん!" + greet; | |
} | |
tanaka = new Person("田中"); | |
// chromeで何度も実行すると、どれもが1番速くなる時があれば遅くなる時もあります。 | |
repeat = 100000; | |
console.time('nest:0'); | |
for (var i = 0; i < repeat; i++) { | |
tanaka.getHelloString("新人", "よろしくね"); | |
} | |
console.timeEnd('nest:0'); // | |
console.time('nest:1'); | |
nest1 = tanaka.getHelloString | |
for (var i = 0; i < repeat; i++) { | |
nest1("新人", "よろしくね"); | |
} | |
console.timeEnd('nest:1'); | |
console.time('nest:2'); | |
nest2 = nest1 | |
for (var i = 0; i < repeat; i++) { | |
nest2("新人", "よろしくね"); | |
} | |
console.timeEnd('nest:2'); |
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