81 lines
2.3 KiB
Markdown
81 lines
2.3 KiB
Markdown
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---
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id: 587d7b8a367417b2b2512b4d
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title: Use Destructuring Assignment to Pass an Object as a Function's Parameters
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challengeType: 1
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---
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## Description
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<section id='description'>
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In some cases, you can destructure the object in a function argument itself.
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Consider the code below:
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<blockquote>const profileUpdate = (profileData) => {<br> const { name, age, nationality, location } = profileData;<br> // do something with these variables<br>}</blockquote>
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This effectively destructures the object sent into the function. This can also be done in-place:
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<blockquote>const profileUpdate = ({ name, age, nationality, location }) => {<br> /* do something with these fields */<br>}</blockquote>
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This removes some extra lines and makes our code look neat.
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This has the added benefit of not having to manipulate an entire object in a function; only the fields that are needed are copied inside the function.
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</section>
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## Instructions
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<section id='instructions'>
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Use destructuring assignment within the argument to the function <code>half</code> to send only <code>max</code> and <code>min</code> inside the function.
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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>stats</code> should be an <code>object</code>.
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testString: 'assert(typeof stats === ''object'', ''<code>stats</code> should be an <code>object</code>.'');'
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- text: <code>half(stats)</code> should be <code>28.015</code>
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testString: 'assert(half(stats) === 28.015, ''<code>half(stats)</code> should be <code>28.015</code>'');'
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- text: Destructuring was used.
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testString: 'getUserInput => assert(getUserInput(''index'').match(/\(\s*\{\s*\w+\s*,\s*\w+\s*\}\s*\)/g), ''Destructuring was used.'');'
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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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const stats = {
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max: 56.78,
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standard_deviation: 4.34,
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median: 34.54,
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mode: 23.87,
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min: -0.75,
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average: 35.85
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};
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const half = (function() {
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"use strict"; // do not change this line
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// change code below this line
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return function half(stats) {
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// use function argument destructuring
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return (stats.max + stats.min) / 2.0;
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};
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// change code above this line
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})();
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console.log(stats); // should be object
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console.log(half(stats)); // should be 28.015
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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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// solution required
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```
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</section>
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