computerToPhone.md

Keypad horror

• Having two standards for a keypad layout is inconvenient!
• Computer keypad's layout:

• Cell phone keypad's layout:

• Solve the horror of unstandardized keypads by providing a function that converts computer input to a number as if it was typed on a phone.

Example:

"789" -> "123"

Notes:

You get a string with numbers only

Solution:

function computerToPhone(numbers) {
  return numbers.split('').map(digit => ({0:'0', 1:'7', 2:'8', 3:'9', 4:'4', 5:'5', 6:'6', 7:'1', 8:'2', 9:'3'})[digit] || '').join('');
}


console.log(computerToPhone("0789456123")); // "0123456789"
console.log(computerToPhone("000")); // "000"
console.log(computerToPhone("94561")); // "34567"
console.log(computerToPhone("")); // ""