Question

我不明白this problem想要我们做什么。

说明说：

我真的不喜欢写这样的课程：

function Animal(name,species,age,health,weight,color) {
  this.name = name;
  this.species = species;
  this.age = age;
  this.health = health;
  this.weight = weight;
  this.color = color;
}

请赋予我创建类似此类的权力：

const Animal = makeClass("name","species","age","health","weight","color")

据我了解，上面的第一个代码块是一个构造函数，在这里，如果您想创建一个实例，则可以执行以下操作：

const Animal = new Animal("name","species","age","health","weight","color")

是否要求我们允许某人使用new关键字创建实例而？

它为我们提供了以下代码：

function makeClass(...properties) {

}

如何允许某人使用此功能创建实例而不使用new关键字？

Answer 1

尝试一下：

function makeClass(){
  let newClass = Object.create(null);

  for(let property of arguments){
    newClass[property] = property;
  }
  return newClass;
}

console.log(makeClass("name","species","age","health","weight","color"));

/*
Returns:
{
name:   "name"
species:"species"
age:    "age"
health: "health"
weight: "weight"
color:  "color"
}
*/

Answer 2

实际上，正如@Paulpro在其评论中解释的那样，这确实解决了挑战：

function makeClass( ...props ) { 
  return function ( ...args ) { 
  props.forEach( (prop, i) => this[prop] = args[i] ) 
  }; 
}

上课-Javascript CodeWars挑战

2 个答案: