68 lines
2.1 KiB
Markdown
68 lines
2.1 KiB
Markdown
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---
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id: 5a23c84252665b21eecc8042
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title: Sum of squares
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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 to find the sum of squares of an array of integers.
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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>sumsq</code> should be a function.
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testString: assert(typeof sumsq == 'function', '<code>sumsq</code> should be a function.');
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- text: <code>sumsq([1, 2, 3, 4, 5])</code> should return a number.
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testString: assert(typeof sumsq([1, 2, 3, 4, 5]) == 'number', '<code>sumsq([1, 2, 3, 4, 5])</code> should return a number.');
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- text: <code>sumsq([1, 2, 3, 4, 5])</code> should return <code>55</code>.
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testString: assert.equal(sumsq([1, 2, 3, 4, 5]), 55, '<code>sumsq([1, 2, 3, 4, 5])</code> should return <code>55</code>.');
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- text: <code>sumsq([25, 32, 12, 7, 20])</code> should return <code>2242</code>.
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testString: assert.equal(sumsq([25, 32, 12, 7, 20]), 2242, '<code>sumsq([25, 32, 12, 7, 20])</code> should return <code>2242</code>.');
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- text: <code>sumsq([38, 45, 35, 8, 13])</code> should return <code>4927</code>.
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testString: assert.equal(sumsq([38, 45, 35, 8, 13]), 4927, '<code>sumsq([38, 45, 35, 8, 13])</code> should return <code>4927</code>.');
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- text: <code>sumsq([43, 36, 20, 34, 24])</code> should return <code>5277</code>.
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testString: assert.equal(sumsq([43, 36, 20, 34, 24]), 5277, '<code>sumsq([43, 36, 20, 34, 24])</code> should return <code>5277</code>.');
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- text: <code>sumsq([12, 33, 26, 18, 1, 16, 3])</code> should return <code>2499</code>.
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testString: assert.equal(sumsq([12, 33, 26, 18, 1, 16, 3]), 2499, '<code>sumsq([12, 33, 26, 18, 1, 16, 3])</code> should return <code>2499</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 sumsq (array) {
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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 sumsq (array) {
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var sum = 0;
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var i, iLen;
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for (i = 0, iLen = array.length; i < iLen; i++) {
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sum += array[i] * array[i];
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}
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return sum;
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}
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```
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</section>
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