cardHide.js

// Write a function that takes a credit card number and only displays the last four characters.
// The rest of the card number must be replaced by ************.

// Examples:
// cardHide("1234123456785678") ➞ "************5678"
// cardHide("8754456321113213") ➞ "************3213"
// cardHide("35123413355523") ➞ "**********5523"

// Notes:
// Ensure you return a string.
// The length of the string must remain the same as the input.

function cardHide(card) {
  const fullNumber = card;
  const last4Digits = fullNumber.slice(-4);
  return last4Digits.padStart(fullNumber.length, "*");
}
console.log(cardHide("1234123456785678"));

// Solution 2:
// const cardHide = card => '*'.repeat(card.length - 4) + card.slice(-4);