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curriculum/challenges/english/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
+---
+
+## Description
+
+<section id='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>
+</section>
+
+## Instructions
+
+<section id='instructions'>
+
+</section>
+
+## Tests
+
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>sumDigits</code> should be a function.
+    testString: assert(typeof sumDigits == 'function');
+  - text: <code>sumDigits("1")</code> should return a number.
+    testString: assert(typeof sumDigits("1") == 'number');
+  - text: <code>sumDigits("1")</code> should return <code>1</code>.
+    testString: assert.equal(sumDigits("1"), 1);
+  - text: <code>sumDigits("12345")</code> should return <code>15</code>.
+    testString: assert.equal(sumDigits("12345"), 15);
+  - text: <code>sumDigits("254")</code> should return <code>11</code>.
+    testString: assert.equal(sumDigits("254"), 11);
+  - text: <code>sumDigits("fe")</code> should return <code>29</code>.
+    testString: assert.equal(sumDigits("fe"), 29);
+  - text: <code>sumDigits("f0e")</code> should return <code>29</code>.
+    testString: assert.equal(sumDigits("f0e"), 29);
+  - text: <code>sumDigits("999ABCXYZ")</code> should return <code>162</code>.
+    testString: assert.equal(sumDigits("999ABCXYZ"), 162);
+```
+
+</section>
+
+## Challenge Seed
+
+<section id='challengeSeed'>
+<div id='js-seed'>
+
+```js
+function sumDigits(n) {
+
+}
+```
+
+</div>
+</section>
+
+## Solution
+
+<section id='solution'>
+
+```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;
+}
+```
+
+</section>