74 lines
1.8 KiB
Markdown
74 lines
1.8 KiB
Markdown
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---
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id: a3566b1109230028080c9345
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title: Sum All Numbers in a Range
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isRequired: true
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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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We'll pass you an array of two numbers. Return the sum of those two numbers plus the sum of all the numbers between them.
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The lowest number will not always come first.
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Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-you-are-stuck/19514' target='_blank'>Read-Search-Ask</a> if you get stuck. Try to pair program. Write your own code.
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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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- text: '<code>sumAll([1, 4])</code> should return a number.'
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testString: 'assert(typeof sumAll([1, 4]) === "number", "<code>sumAll([1, 4])</code> should return a number.");'
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- text: '<code>sumAll([1, 4])</code> should return 10.'
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testString: 'assert.deepEqual(sumAll([1, 4]), 10, "<code>sumAll([1, 4])</code> should return 10.");'
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- text: '<code>sumAll([4, 1])</code> should return 10.'
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testString: 'assert.deepEqual(sumAll([4, 1]), 10, "<code>sumAll([4, 1])</code> should return 10.");'
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- text: '<code>sumAll([5, 10])</code> should return 45.'
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testString: 'assert.deepEqual(sumAll([5, 10]), 45, "<code>sumAll([5, 10])</code> should return 45.");'
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- text: '<code>sumAll([10, 5])</code> should return 45.'
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testString: 'assert.deepEqual(sumAll([10, 5]), 45, "<code>sumAll([10, 5])</code> should return 45.");'
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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 sumAll(arr) {
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return 1;
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}
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sumAll([1, 4]);
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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 sumAll(arr) {
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var sum = 0;
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arr.sort(function(a,b) {return a-b;});
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for (var i = arr[0]; i <= arr[1]; i++) {
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sum += 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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