How to Construct an array by es6 class

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?

Not sure what you are trying to achieve. Why should `Array.isArray(myArray)` be `true` when it's obviously a `class` and not an array. — klugjo, Dec 13 '17 at 09:43
Possible dup of: https://stackoverflow.com/questions/3261587/subclassing-javascript-arrays-typeerror-array-prototype-tostring-is-not-generi — Tal, Dec 13 '17 at 09:55

score 7 · Answer 1 · answered Dec 13 '17 at 09:43

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));

1 Answers1