ECMAScript 6中较短的类初始化 [英] A shorter class initialisation in ECMAScript 6

问题描述

每次我创建一些课程时，我都需要做同样无聊的过程：

Every time I create some class, I need to do the same boring procedure:

class Something {
  constructor(param1, param2, param3, ...) {
    this.param1 = param1;
    this.param2 = param2;
    this.param3 = param3;
    ...
  }
}

有没有办法使其更加优雅和更短？我使用Babel，所以一些ES7实验功能是允许的。可能装修者可以帮助？

Is there any way to make it more elegant and shorter? I use Babel, so some ES7 experimental features are allowed. Maybe decorators can help?

推荐答案

您可以使用 Object.assign ：

You can use Object.assign:

class Something {
  constructor(param1, param2, param3) {
    Object.assign(this, {param1, param2, param3});
  }
}

这是一个ES2015（又称ES6）功能，一个或多个源对象的目标对象的属性可以枚举。

It's an ES2015 (aka ES6) feature that assigns the own enumerable properties of one or more source objects to a target object.

授予你必须编写参数名称两次，但至少这是一个很短的时间，如果你建立这个作为你的成语，它处理得很好，当你有你想要的实例和其他你没有的参数，例如：

Granted, you have to write the arg names twice, but at least it's a lot shorter, and if you establish this as your idiom, it handles it well when you have arguments you do want on the instance and others you don't, e.g.:

class Something {
  constructor(param1, param2, param3) {
    Object.assign(this, {param1, param3});
    // ...do something with param2, since we're not keeping it as a property...
  }
}

示例：（

Example: (live copy on Babel's REPL):

class Something {
  constructor(param1, param2, param3) {
    Object.assign(this, {param1, param2, param3});
  }
}
let s = new Something('a', 'b', 'c');
console.log(s.param1);
console.log(s.param2);
console.log(s.param3);

输出：

a
b
c

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