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

With the latest Typescript, you can do:

let myStr:string = padLeft('123', '0', 6);  // '000123'

padLeft(text:string, padChar:string, size:number): string {
    return (String(padChar).repeat(size) + text).substr( (size * -1), size) ;
}