yeyan1996/practical-javascript

28 JavaScript Skills a Qualified Intermediate Front-End Engineer Needs to Master

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practical-javascript's Issues

selfMap arr=Array.prototype.slice.call(this);

arr 直接使用 this 不可以吗？ 这样使用是考虑类数组吗？

bind实现中 length 属性的问题

bind 方法实现那里length值貌似不对，length值不和原函数保持一致。比如：

function add (a, b, c) {};
var boundAdd = add.bind(null, 1);
console.log(add.length, boundAdd.length) // 3 2

私以为应该改成这样：

Object.defineProperties(boundFunc, {
  length: Object.assign(desc.length, {
      value: desc.length < args.length ? 0 : (desc.length - args.length)
  }),
  name: Object.assign(desc.name, {
      value: `bound ${desc.name.value}`
  })
})