#13 - Keypad Horror CodeWars Kata (7 kyu)

Instructions

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

My solution:

function computerToPhone(numbers){
  const k = ['0','7','8','9','4','5','6','1','2','3']
  const p = ['0','1','2','3','4','5','6','7','8','9']
  return numbers.split('').map(d=> p[k.indexOf(d)] ).join('')
}

Explanation

First I did two const variables one with keyboard numbers in order and the phone numbers in order

const k = ['0','7','8','9','4','5','6','1','2','3']
const p = ['0','1','2','3','4','5','6','7','8','9']

Then splitted the numbers string from the parameter into an array and I mapped that array, in every digit I would search in the phone numbers array the number that it is iterating, searching the index of that number into the keyboard numbers array, and then I just joined that new array, and finally I just returned the result

return numbers.split('').map(d=> p[k.indexOf(d)] ).join('')

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