javascript - 如何根据动态变量将元素插入数组

Question

我有一个对象，我想用对象属性填充一个数组，并根据每个属性的值重复多次。一个例子:

obj = {
   watches: 3
   rings: 1
}
// => ['watches', 'watches', 'watches', 'rings']

以下是我目前所拥有的。我很难弄清楚如何根据关联值重复每个属性？

function arrayBuilder(obj) {
  let objToArr = [];

  for (let [property, value] of Object.entries(obj)) {
    objToArr.push(property);
  }
  return objToArr;
}

console.log(arrayBuilder({watches: 3, rings: 1}));
// => [ 'watches', 'rings' ]

Answer 1

您只是缺少一个内部循环:

function arrayBuilder(obj) {
  let objToArr = [];

  for (let [property, value] of Object.entries(obj)) {
    for(var i=0; i<value; i++){
      objToArr.push(property);
    }
  }
  return objToArr;
}

console.log(arrayBuilder({watches: 3, rings: 1}));