A szöveg eléjéhez ad annyi karaktert, hogy a hossz megadott legyen.
padStart(targetLength) padStart(targetLength, padString)
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"