How to add numbers in an array - Typescript

Question

I want 5 numbers ranging from 1 to 5 (numberOfScreen has value 5 which comes from the API captured in it) to be pushed into the array, but I am getting the below error

core.js:6241 ERROR TypeError: Cannot read property 'push' of undefined

Find the code snippet below:

screens: Array<number>;
numberOfScreen: number;

get screenNumbers(): Number[] {
  for (let i = 1; i <= this.numberOfScreen; i++) {
    this.screens.push(i);
  }
  return this.screens;
}

I am new to Typescript so I wanted to understand where I am going wrong.

screens: Array<number>; is not yet initialized. screens = []; — Chenna
– Chenna, Commented Jul 22, 2020 at 9:18

Shannon Matthews · Accepted Answer · 2021-01-10 00:20:49Z

1

Initialize your screens variable with blank array;

screens: Array<number> = [];

edited Jan 10, 2021 at 0:20

Shannon Matthews

10.5k7 gold badges49 silver badges78 bronze badges

answered Jul 22, 2020 at 9:18

Vivek Jain

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