73 lines
2.4 KiB
Markdown
73 lines
2.4 KiB
Markdown
---
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id: 5a23c84252665b21eecc803f
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title: Sum digits of an integer
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challengeType: 5
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---
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## Description
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<section id='description'>
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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.
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<ul>
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<li><b>1</b><sub>10</sub> sums to <b>1</b></li>
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<li><b>1234</b><sub>10</sub> sums to <b>10</b></li>
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<li><b>fe</b><sub>16</sub> sums to <b>29</b></li>
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<li><b>f0e</b><sub>16</sub> sums to <b>29</b></li>
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</ul>
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</section>
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## Instructions
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<section id='instructions'>
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</section>
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## Tests
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<section id='tests'>
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``` yml
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tests:
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- text: <code>sumDigits</code> should be a function.
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testString: assert(typeof sumDigits == 'function', '<code>sumDigits</code> should be a function.');
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- text: <code>sumDigits("1")</code> should return a number.
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testString: assert(typeof sumDigits("1") == 'number', '<code>sumDigits("1")</code> should return a number.');
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- text: <code>sumDigits("1")</code> should return <code>1</code>.
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testString: assert.equal(sumDigits("1"), 1, '<code>sumDigits("1")</code> should return <code>1</code>.');
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- text: <code>sumDigits("12345")</code> should return <code>15</code>.
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testString: assert.equal(sumDigits("12345"), 15, '<code>sumDigits("12345")</code> should return <code>15</code>.');
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- text: <code>sumDigits("254")</code> should return <code>11</code>.
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testString: assert.equal(sumDigits("254"), 11, '<code>sumDigits("254")</code> should return <code>11</code>.');
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- text: <code>sumDigits("fe")</code> should return <code>29</code>.
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testString: assert.equal(sumDigits("fe"), 29, '<code>sumDigits("fe")</code> should return <code>29</code>.');
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- text: <code>sumDigits("f0e")</code> should return <code>29</code>.
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testString: assert.equal(sumDigits("f0e"), 29, '<code>sumDigits("f0e")</code> should return <code>29</code>.');
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- text: <code>sumDigits("999ABCXYZ")</code> should return <code>162</code>.
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testString: assert.equal(sumDigits("999ABCXYZ"), 162, '<code>sumDigits("999ABCXYZ")</code> should return <code>162</code>.');
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function sumDigits (n) {
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// Good luck!
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}
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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function sumDigits (n) {
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n += ''
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for (var s=0, i=0, e=n.length; i<e; i+=1) s+=parseInt(n.charAt(i),36)
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return s
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}
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```
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</section>
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