87 lines
3.2 KiB
Markdown
87 lines
3.2 KiB
Markdown
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---
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id: af2170cad53daa0770fabdea
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title: Mutations
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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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Return true if the string in the first element of the array contains all of the letters of the string in the second element of the array.
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For example, <code>["hello", "Hello"]</code>, should return true because all of the letters in the second string are present in the first, ignoring case.
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The arguments <code>["hello", "hey"]</code> should return false because the string "hello" does not contain a "y".
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Lastly, <code>["Alien", "line"]</code>, should return true because all of the letters in "line" are present in "Alien".
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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. 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>mutation(["hello", "hey"])</code> should return false.'
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testString: 'assert(mutation(["hello", "hey"]) === false, ''<code>mutation(["hello", "hey"])</code> should return false.'');'
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- text: '<code>mutation(["hello", "Hello"])</code> should return true.'
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testString: 'assert(mutation(["hello", "Hello"]) === true, ''<code>mutation(["hello", "Hello"])</code> should return true.'');'
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- text: '<code>mutation(["zyxwvutsrqponmlkjihgfedcba", "qrstu"])</code> should return true.'
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testString: 'assert(mutation(["zyxwvutsrqponmlkjihgfedcba", "qrstu"]) === true, ''<code>mutation(["zyxwvutsrqponmlkjihgfedcba", "qrstu"])</code> should return true.'');'
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- text: '<code>mutation(["Mary", "Army"])</code> should return true.'
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testString: 'assert(mutation(["Mary", "Army"]) === true, ''<code>mutation(["Mary", "Army"])</code> should return true.'');'
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- text: '<code>mutation(["Mary", "Aarmy"])</code> should return true.'
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testString: 'assert(mutation(["Mary", "Aarmy"]) === true, ''<code>mutation(["Mary", "Aarmy"])</code> should return true.'');'
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- text: '<code>mutation(["Alien", "line"])</code> should return true.'
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testString: 'assert(mutation(["Alien", "line"]) === true, ''<code>mutation(["Alien", "line"])</code> should return true.'');'
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- text: '<code>mutation(["floor", "for"])</code> should return true.'
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testString: 'assert(mutation(["floor", "for"]) === true, ''<code>mutation(["floor", "for"])</code> should return true.'');'
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- text: '<code>mutation(["hello", "neo"])</code> should return false.'
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testString: 'assert(mutation(["hello", "neo"]) === false, ''<code>mutation(["hello", "neo"])</code> should return false.'');'
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- text: '<code>mutation(["voodoo", "no"])</code> should return false.'
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testString: 'assert(mutation(["voodoo", "no"]) === false, ''<code>mutation(["voodoo", "no"])</code> should return false.'');'
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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 mutation(arr) {
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return arr;
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}
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mutation(["hello", "hey"]);
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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 mutation(arr) {
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let hash = Object.create(null);
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arr[0].toLowerCase().split('').forEach(c => hash[c] = true);
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return !arr[1].toLowerCase().split('').filter(c => !hash[c]).length;
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}
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mutation(["hello", "hey"]);
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```
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</section>
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