如何通过es6类构造数组

Question

I expect that a class return an array when I new it

class MyArray {
  constructor(){

  }
}

const myArray = new MyArray()
Array.isArray(myArray) // Should be true

I used to write it in this way:

class MyArray {
  constructor(){
    const arry = new Array()
    return arry
  }
}

But when I write in Typescript,the return value arry is not the type of MyArray, so it prompt an error.

How to fixed this problem?

Answer 1

Just extend Array and return true in the constructor

class MyArray extends Array{
  constructor(){
    super()
  }
}

Demo

 class MyArray extends Array{ constructor(){ super() } } myArray2 = new MyArray() console.log(Array.isArray(myArray2));