クラスについて

継承

abstract class Horse {
    private jockey: string;
    constructor(private jockey: string) {
    }
    run() {
        console.log(`${this.getName()}が${this.jockey}を乗せて走る`);
    }
    abstract getName(): string;
}

class MihonoBourbon extends Horse {
    constructor(jockey: string) {
        super(jockey);
    }
    run() {
        console.log("めっちゃ逃げる");
        super.run();
    }
    getName(): string {
        return "ミホノブルボン";
    }
}

class NaritaTaishin extends Horse {
    constructor(jockey: string) {
        super(jockey);
    }
    run() {
        console.log("めっちゃ追い込む");
        super.run();
    }
    getName(): string {
        return "ナリタタイシン";
    }
}

const horse1 = new MihonoBourbon("小島貞博");
const horse2 = new NaritaTaishin("武豊");

horse1.run();
horse2.run();

引数プロパティ

プロパティの宣言と代入を同時にできる

class Horse {
    private jockey: string;
    constructor(jockey: string) {
        this.jockey = jockey;
    }
}

↓

class Horse {
    constructor(private jockey: string) {
    }
}

Getter&Setter

class Book {
    private _title: string;
    get title() {
        return this._title;
    }
    set title(title: string) {
        this._title = `[${title}]`;
    }
}

const b = new Book();
b.title = "真夜中は別の顔";
console.log(b.title);