angular 2 add zero as a string before number doesn't work

Question

hello everyone i'm working on a clock timer i wrote the code in angular code it work very fine

let timer: string = "0:00:00"; startPause() { this.play = false; this.pause = true; let sec = 0; let min = 0; let hour = 0; setInterval(() => { if(sec === 59) { min++; sec = 0; } else if(min > 59) { hour++; min = 0; } else { sec++; } this.timer = `${hour}:${min}:${sec}`; }, 10); }

the output is correct but when i want to add zero before seconds or minutes or hours if they are < 10 i write this sec = "0" + sec it tells me the String Type Is Not assignable to sec thank u.

Create a separate padding function (as described in this answer), then just use it within the string template (like ${pad(hour)}:${pad(min)}... etc.) — raina77ow
– raina77ow, Commented Aug 2, 2017 at 12:19

Андрій Кукуруза · Accepted Answer · 2017-08-02 12:32:38Z

Try something like this:

... let strSec = String(sec); if (sec < 10) { strSec = '0' + strSec; } ... //same for hour and min this.timer = `${strHour}:${strSec}:${strSec}`;

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