ktyr report

/*
デコレータファクトリ
言い換えると引数付デコレータ
*/
function logged(message = "[LOG]:"){
    return function actDeco(originalMethod:any,context:any){
        function loggedMethod(this:any,...args:any[]){
            console.log(`${message} ${context.name} start`);
            const result = originalMethod.call(this,...args);
            console.log(`${message} ${context.name} finish`);
        }
        return loggedMethod;
    };
}
function bound(_originalMethod:any,context:any){
    context.addInitializer(function(this:any){
        this[context.name] = this[context.name].bind(this);
    });
}

class Article{
    protected name:string;
    constructor(name:string){
        this.name = name;
    }
    @bound
    @logged("[Article]:")
    showData():void{
        console.log(this.name);
    }
}

const article = new Article("John Smith");
article.showData();

　
出力

[Article]: showData start
John Smith
[Article]: showData finish