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

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+---
+id: 5a23c84252665b21eecc803f
+title: Sum digits of an integer
+challengeType: 5
+forumTopicId: 302331
+dashedName: 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.
+
+<ul>
+  <li><b>1</b><sub>10</sub> sums to <b>1</b></li>
+  <li><b>1234</b><sub>10</sub> sums to <b>10</b></li>
+  <li><b>fe</b><sub>16</sub> sums to <b>29</b></li>
+  <li><b>f0e</b><sub>16</sub> sums to <b>29</b></li>
+</ul>
+
+# --hints--
+
+`sumDigits` should be a function.
+
+```js
+assert(typeof sumDigits == 'function');
+```
+
+`sumDigits("1")` should return a number.
+
+```js
+assert(typeof sumDigits('1') == 'number');
+```
+
+`sumDigits("1")` should return `1`.
+
+```js
+assert.equal(sumDigits('1'), 1);
+```
+
+`sumDigits("12345")` should return `15`.
+
+```js
+assert.equal(sumDigits('12345'), 15);
+```
+
+`sumDigits("254")` should return `11`.
+
+```js
+assert.equal(sumDigits('254'), 11);
+```
+
+`sumDigits("fe")` should return `29`.
+
+```js
+assert.equal(sumDigits('fe'), 29);
+```
+
+`sumDigits("f0e")` should return `29`.
+
+```js
+assert.equal(sumDigits('f0e'), 29);
+```
+
+`sumDigits("999ABCXYZ")` should return `162`.
+
+```js
+assert.equal(sumDigits('999ABCXYZ'), 162);
+```
+
+# --seed--
+
+## --seed-contents--
+
+```js
+function sumDigits(n) {
+
+}
+```
+
+# --solutions--
+
+```js
+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;
+}
+```