CodeUp - Karen (22nd May 2018)

index.js

// Mapping between letters and values
const numbers = { 
  A: 1,
  B: 2,
  C: 3,
  D: 4,
  E: 5,
  F: 6,
  G: 7
  // ...
};

// create a counter
let counter = 0;

// get input
const input = process.argv[2].toUpperCase(); // ==> HELLO

// get letters
const letters = input.split(''); // => ['H', 'E', 'L', 'L', 'O']

// loop over the letters
for (const letter of letters) {
  // get the value of the letter or fallback to zero
  const number = numbers[letter] || 0;

  // increment a counter with the number of the letter
  counter += number;
}

// output the counter
console.log(counter);