Angular2 or TypeScript Left padding a String with Zeros

Question

I have a number let say 9. But I need it as String \"09\".

I know i can write my own logic. But I am looking for a implicit util function which can pad it.

I

Answer 1

if i want to pad "0" at the start and want the length of the String str to be 9:

str.padStart(9 ,"0")