Use Math functions in Angular and cast number to integer

Question

I have the following Angular 7 Typescript class:

export class Paging {

  itemCount: number;
  pageCount: number;
  pageNumber: number;
  pageSize: number;    

  constructor(pageNumber: number, pageSize: number, itemCount: number) {

    this.itemCount = itemCount;
    this.pageCount = itemCount > 0 ? (number)Math.ceil(itemCount / pageSize) : 0;
    this.pageNumber = pageNumber;
    this.pageSize = pageSize;

  }

}

I have 2 problems:
1. How to import Math functions (at the moment I am getting an error)?
2. How to convert the result of the calculation Math.ceil(itemCount / pageSize) to an integer?

Remove the (number) bit and you should be fine. Typescript doesn't have an integer type, only number, but Math.ceil will certainly return an integer in the mathematical sense — user184994
– user184994, Commented Nov 6, 2018 at 11:12
1)U no need to import math functions in typescript 2)try parseInt — arun kumar
– arun kumar, Commented Nov 6, 2018 at 11:26

NoLogig · Accepted Answer · 2018-11-06 13:04:09Z

1

Like user184994 comment, just remove (number)

this.pageCount = itemCount > 0 ? Math.ceil(itemCount / pageSize) : 0;

Math.ceil returns integers: number (The smallest integer greater than or equal to its numeric argument).

If you need convert into numbers:

let str2deci = parseInt('123', 10);

let num = Number('456');

answered Nov 6, 2018 at 13:04

NoLogig

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