freeCodeCamp/curriculum/challenges/english/10-coding-interview-prep/rosetta-code/sum-digits-of-an-integer.md

id, title, challengeType, forumTopicId, dashedName

id	title	challengeType	forumTopicId	dashedName
5a23c84252665b21eecc803f	Sum digits of an integer	5	302331	sum-digits-of-an-integer

--description--

Write a function that takes a string as a parameter. This string represents a number that can be in any base (less than 37) and return the sum of its digits.

• 1₁₀ sums to 1
• 1234₁₀ sums to 10
• fe₁₆ sums to 29
• f0e₁₆ sums to 29

--hints--

sumDigits should be a function.

assert(typeof sumDigits == 'function');

sumDigits("1") should return a number.

assert(typeof sumDigits('1') == 'number');

sumDigits("1") should return 1.

assert.equal(sumDigits('1'), 1);

sumDigits("12345") should return 15.

assert.equal(sumDigits('12345'), 15);

sumDigits("254") should return 11.

assert.equal(sumDigits('254'), 11);

sumDigits("fe") should return 29.

assert.equal(sumDigits('fe'), 29);

sumDigits("f0e") should return 29.

assert.equal(sumDigits('f0e'), 29);

sumDigits("999ABCXYZ") should return 162.

assert.equal(sumDigits('999ABCXYZ'), 162);

--seed--

--seed-contents--

function sumDigits(n) {

}

--solutions--

function sumDigits(n) {
  n += '';
  for (var s = 0, i = 0, e = n.length; i < e; i += 1)
    s += parseInt(n.charAt(i), 36);
  return s;
}