4fbce07792
* fix: improve test regex to validate disallowed methods that can be bypassed by prototype reassignments and/or otherwise * fix: fixing regex pattern
83 lines
3.2 KiB
Markdown
83 lines
3.2 KiB
Markdown
---
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id: 587d7dab367417b2b2512b6d
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title: Apply Functional Programming to Convert Strings to URL Slugs
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challengeType: 1
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forumTopicId: 301227
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---
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## Description
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<section id='description'>
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The last several challenges covered a number of useful array and string methods that follow functional programming principles. We've also learned about <code>reduce</code>, which is a powerful method used to reduce problems to simpler forms. From computing averages to sorting, any array operation can be achieved by applying it. Recall that <code>map</code> and <code>filter</code> are special cases of <code>reduce</code>.
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Let's combine what we've learned to solve a practical problem.
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Many content management sites (CMS) have the titles of a post added to part of the URL for simple bookmarking purposes. For example, if you write a Medium post titled "Stop Using Reduce", it's likely the URL would have some form of the title string in it (".../stop-using-reduce"). You may have already noticed this on the freeCodeCamp site.
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</section>
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## Instructions
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<section id='instructions'>
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Fill in the <code>urlSlug</code> function so it converts a string <code>title</code> and returns the hyphenated version for the URL. You can use any of the methods covered in this section, and don't use <code>replace</code>. Here are the requirements:
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The input is a string with spaces and title-cased words
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The output is a string with the spaces between words replaced by a hyphen (<code>-</code>)
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The output should be all lower-cased letters
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The output should not have any spaces
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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: The <code>globalTitle</code> variable should not change.
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testString: assert(globalTitle === "Winter Is Coming");
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- text: Your code should not use the <code>replace</code> method for this challenge.
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testString: assert(!code.match(/\.?[\s\S]*?replace/g));
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- text: <code>urlSlug("Winter Is Coming")</code> should return <code>"winter-is-coming"</code>.
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testString: assert(urlSlug("Winter Is Coming") === "winter-is-coming");
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- text: <code>urlSlug(" Winter Is Coming")</code> should return <code>"winter-is-coming"</code>.
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testString: assert(urlSlug(" Winter Is Coming") === "winter-is-coming");
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- text: <code>urlSlug("A Mind Needs Books Like A Sword Needs A Whetstone")</code> should return <code>"a-mind-needs-books-like-a-sword-needs-a-whetstone"</code>.
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testString: assert(urlSlug("A Mind Needs Books Like A Sword Needs A Whetstone") === "a-mind-needs-books-like-a-sword-needs-a-whetstone");
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- text: <code>urlSlug("Hold The Door")</code> should return <code>"hold-the-door"</code>.
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testString: assert(urlSlug("Hold The Door") === "hold-the-door");
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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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// The global variable
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var globalTitle = "Winter Is Coming";
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// Only change code below this line
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function urlSlug(title) {
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}
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// Only change code above this line
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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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// The global variable
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var globalTitle = "Winter Is Coming";
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// Only change code below this line
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function urlSlug(title) {
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return title.trim().split(/\s+/).join("-").toLowerCase();
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}
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```
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</section>
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