May 2019
Intermediate to advanced
464 pages
9h 22m
Japanese
Content preview from Node.jsデザインパターン 第2版
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426
付録
A
ES2015
以降の
JavaScript
の主要機能
static older (person1, person2) {
return (person1.age >= person2.age) ? person1 : person2;
}
}
こちらのコードのほうが読みやすく素直な記述になっています。まず、関数のコンストラクタは明示
的に
constructor
と指定されています。さらに、
older
は静
スタティック
的なメソッドとして宣言されています。
上の
2
つの実装は内部的には何も変わりません。しかし、この新しい構文の真の価値は、この
Person
クラスを継承して、サブクラスから親クラスにアクセスするために
extend
と
super
を使用す
る際に見られます。では、
Person
クラスを継承する
PersonWithMiddlename
を実装してみましょう。
class PersonWithMiddlename extends Person {
co
nstructor (name, middlename, surname, age) {
super(name, surname, age);
this.middlename = middlename;
}
getFullName () {
return this.name + '' + this.middlename + '' + this.surname;
}
}
どうでしょう。他のオブジェクト指向のプログラミング言語に非常に似た構文ではな ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.