Addition operation in angular2 using typescript

Question

I wrote a component like below:

export class AppComponent {
    public num1: number = 2;
    public num2: number = 3;
    public sum: number = 0;
    public add() {
        this.sum = this.num1 + this.num2;
    }
}

For this, I'm getting sum as 23 instead of 5. Give me a proper solution to do addition. I will be glad to know the answer

Answer 1

this is because your numbers are being treated as strings.

so its doing "2" + "3" = "23"

to force a number use parseInt function or do ...

this.sum = +this.num1 + +this.num2;

or this should work too ...

this.sum = +this.num1 + this.num2;