77 lines
3.2 KiB
Markdown
77 lines
3.2 KiB
Markdown
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---
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id: a5deed1811a43193f9f1c841
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title: Drop it
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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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Given the array <code>arr</code>, iterate through and remove each element starting from the first element (the 0 index) until the function <code>func</code> returns <code>true</code> when the iterated element is passed through it.
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Then return the rest of the array once the condition is satisfied, otherwise, <code>arr</code> should be returned as an empty array.
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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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tests:
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- text: '<code>dropElements([1, 2, 3, 4], function(n) {return n >= 3;})</code> should return <code>[3, 4]</code>.'
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testString: 'assert.deepEqual(dropElements([1, 2, 3, 4], function(n) {return n >= 3;}), [3, 4], ''<code>dropElements([1, 2, 3, 4], function(n) {return n >= 3;})</code> should return <code>[3, 4]</code>.'');'
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- text: '<code>dropElements([0, 1, 0, 1], function(n) {return n === 1;})</code> should return <code>[1, 0, 1]</code>.'
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testString: 'assert.deepEqual(dropElements([0, 1, 0, 1], function(n) {return n === 1;}), [1, 0, 1], ''<code>dropElements([0, 1, 0, 1], function(n) {return n === 1;})</code> should return <code>[1, 0, 1]</code>.'');'
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- text: '<code>dropElements([1, 2, 3], function(n) {return n > 0;})</code> should return <code>[1, 2, 3]</code>.'
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testString: 'assert.deepEqual(dropElements([1, 2, 3], function(n) {return n > 0;}), [1, 2, 3], ''<code>dropElements([1, 2, 3], function(n) {return n > 0;})</code> should return <code>[1, 2, 3]</code>.'');'
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- text: '<code>dropElements([1, 2, 3, 4], function(n) {return n > 5;})</code> should return <code>[]</code>.'
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testString: 'assert.deepEqual(dropElements([1, 2, 3, 4], function(n) {return n > 5;}), [], ''<code>dropElements([1, 2, 3, 4], function(n) {return n > 5;})</code> should return <code>[]</code>.'');'
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- text: '<code>dropElements([1, 2, 3, 7, 4], function(n) {return n > 3;})</code> should return <code>[7, 4]</code>.'
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testString: 'assert.deepEqual(dropElements([1, 2, 3, 7, 4], function(n) {return n > 3;}), [7, 4], ''<code>dropElements([1, 2, 3, 7, 4], function(n) {return n > 3;})</code> should return <code>[7, 4]</code>.'');'
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- text: '<code>dropElements([1, 2, 3, 9, 2], function(n) {return n > 2;})</code> should return <code>[3, 9, 2]</code>.'
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testString: 'assert.deepEqual(dropElements([1, 2, 3, 9, 2], function(n) {return n > 2;}), [3, 9, 2], ''<code>dropElements([1, 2, 3, 9, 2], function(n) {return n > 2;})</code> should return <code>[3, 9, 2]</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 dropElements(arr, func) {
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// Drop them elements.
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return arr;
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}
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dropElements([1, 2, 3], function(n) {return n < 3; });
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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 dropElements(arr, func) {
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// Drop them elements.
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while (arr.length && !func(arr[0])) {
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arr.shift();
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}
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return arr;
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}
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```
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</section>
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