javascript padstart
const str1 = '5';
console.log(str1.padStart(2, '0'));
// expected output: "05"
const fullNumber = '2034399002125581';
const last4Digits = fullNumber.slice(-4);
const maskedNumber = last4Digits.padStart(fullNumber.length, '*');
console.log(maskedNumber);
// expected output: "************5581"
4.29
7
export function padStart(number, digits = 2, emptyDigit = 0) {
let length = 0;
let n = Math.abs(number);
let absoluteNumber = n;
do {
n /= 10;
length++;
} while (n >= 1);
const prefix = Array(Math.max((digits - length) + 1, 0)).join(emptyDigit);
return number < 0 ? `-${prefix}${absoluteNumber}` : prefix + number;
}
export default padStart;
Thank you!
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