[JS Practice] Find majuscule letters

Title :

Find majuscule letters



Write a function capitals that takes a single string (word) as argument. The functions must return an ordered list containing the indexes of all capital letters in the string.


Test.assertSimilar( capitals('CodEWaRs'), [0,3,4,6] );

My solution :

var capitals = function (word) {
	var capLetters = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 
                    'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 
                    'U', 'V', 'W', 'X', 'Y', 'Z'],
      arrRet = [];  
  word.split('').forEach(function(value, key){
    if(capLetters.indexOf(value) != -1) {
  return arrRet;

Better Solution :

var capitals = function (word) {
  return word.split('').reduce(function(memo, v, i) {
    return v === v.toUpperCase() ? memo.concat(i) : memo;
  }, []);


Ref. from codewars


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