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

public padIntegerLeftWithZeros(rawInteger: number, numberOfDigits: number): string {
    let paddedInteger: string = rawInteger + '';
    while (paddedInteger.length < numberOfDigits) {
        paddedInteger = '0' + paddedInteger;
    }
    return paddedInteger;
}

public zeroPadIntegerLeft3Digits(rawInteger: number): string {
    return this.padIntegerLeftWithZeros(rawInteger, 3);
}