Angular 6 / Typescript - How do I check if there's a single digit in a variable

Question

I have this value:

this.value.day

It returns a number from 1 to 31.

However, I'd like to insert a 0 if it's less than 10, how can I do that?

You can use `padStart` from the String prototype: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padStart — Hunter McMillen, Aug 16 '18 at 21:39
Possible duplicate of [How can I pad a value with leading zeros?](https://stackoverflow.com/questions/1267283/how-can-i-pad-a-value-with-leading-zeros) — ConnorsFan, Aug 16 '18 at 22:35

score 2 · Accepted Answer · answered Aug 16 '18 at 22:23

2

One liner and cross browser compatible

newValue = ('0' + this.value.day.toString()).slice(-2);

answered Aug 16 '18 at 22:23

wFitz

score 0 · Answer 2 · answered Aug 16 '18 at 21:44

0

Well, this is not an elegant solution, but it gets the job done.

if (this.value.day < 10) {
  this.dayRender = "0" + this.value.day;
} else {
  this.dayRender = this.value.day;
}

answered Aug 16 '18 at 21:44

Rosenberg

2 Answers2