68 lines
1.8 KiB
Markdown
68 lines
1.8 KiB
Markdown
---
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id: 56bbb991ad1ed5201cd392ce
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title: Manipulate Arrays With unshift()
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challengeType: 1
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videoUrl: ''
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localeTitle: Manipular matrices con unshift ()
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---
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## Description
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<section id="description"> No solo puede <code>shift</code> elementos del principio de una matriz, <code>unshift</code> también puede <code>unshift</code> elementos al principio de una matriz, es decir, agregar elementos delante de la matriz. <code>.unshift()</code> funciona exactamente como <code>.push()</code> , pero en lugar de agregar el elemento al final de la matriz, <code>unshift()</code> agrega el elemento al principio de la matriz. </section>
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## Instructions
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<section id="instructions"> Añadir <code>["Paul",35]</code> para el inicio de la <code>myArray</code> variable usando <code>unshift()</code> . </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>myArray</code> ahora debería tener [["Paul", 35], ["dog", 3]].'
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testString: 'assert((function(d){if(typeof d[0] === "object" && d[0][0] == "Paul" && d[0][1] === 35 && d[1][0] != undefined && d[1][0] == "dog" && d[1][1] != undefined && d[1][1] == 3){return true;}else{return false;}})(myArray), "<code>myArray</code> should now have [["Paul", 35], ["dog", 3]].");'
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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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// Example
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var ourArray = ["Stimpson", "J", "cat"];
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ourArray.shift(); // ourArray now equals ["J", "cat"]
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ourArray.unshift("Happy");
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// ourArray now equals ["Happy", "J", "cat"]
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// Setup
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var myArray = [["John", 23], ["dog", 3]];
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myArray.shift();
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// Only change code below this line.
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```
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</div>
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### After Test
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<div id='js-teardown'>
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```js
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console.info('after the test');
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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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