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Basic JS challenge: use-prototype-properties link added (#37802)

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* Update use-prototype-properties-to-reduce-duplicate-code.english.md

* Update use-prototype-properties-to-reduce-duplicate-code.english.md
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Kiara Barias
2019-11-25 14:02:21 -05:00
committed by Tom
parent 4fbe02abba
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curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-prototype-properties-to-reduce-duplicate-code.english.md
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@ -9,7 +9,7 @@ forumTopicId: 301336
<section id='description'> <section id='description'>
Since <code>numLegs</code> will probably have the same value for all instances of <code>Bird</code>, you essentially have a duplicated variable <code>numLegs</code> inside each <code>Bird</code> instance. Since <code>numLegs</code> will probably have the same value for all instances of <code>Bird</code>, you essentially have a duplicated variable <code>numLegs</code> inside each <code>Bird</code> instance.
This may not be an issue when there are only two instances, but imagine if there are millions of instances. That would be a lot of duplicated variables. This may not be an issue when there are only two instances, but imagine if there are millions of instances. That would be a lot of duplicated variables.
A better way is to use <code>Bird’s</code> <code>prototype</code>. The <code>prototype</code> is an object that is shared among ALL instances of <code>Bird</code>. Here's how to add <code>numLegs</code> to the <code>Bird prototype</code>: A better way is to use <code>Bird’s</code> <code>prototype</code>. Properties in the <code>prototype</code> are shared among ALL instances of <code>Bird</code>. Here's how to add <code>numLegs</code> to the <code>Bird prototype</code>:
```js ```js
Bird.prototype.numLegs = 2; Bird.prototype.numLegs = 2;
@ -26,6 +26,7 @@ Since all instances automatically have the properties on the <code>prototype</co
Note that the <code>prototype</code> for <code>duck</code> and <code>canary</code> is part of the <code>Bird</code> constructor as <code>Bird.prototype</code>. Nearly every object in JavaScript has a <code>prototype</code> property which is part of the constructor function that created it. Note that the <code>prototype</code> for <code>duck</code> and <code>canary</code> is part of the <code>Bird</code> constructor as <code>Bird.prototype</code>. Nearly every object in JavaScript has a <code>prototype</code> property which is part of the constructor function that created it.
</section> </section>
## Instructions ## Instructions
<section id='instructions'> <section id='instructions'>
Add a <code>numLegs</code> property to the <code>prototype</code> of <code>Dog</code> Add a <code>numLegs</code> property to the <code>prototype</code> of <code>Dog</code>