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---
id: 56533eb9ac21ba0edf2244e1
title: Nesting For Loops
localeTitle: Anidando para bucles
challengeType: 1
---
## Description
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< section id = 'description' >
Si tiene una matriz multidimensional, puede usar la misma lógica que el punto de ruta anterior para recorrer tanto la matriz como cualquier subarreglo. Aquí hay un ejemplo:
< blockquote > var arr = [< br > [1,2], [3,4], [5,6]< br > ];< br > for (var i=0; i < arr.length; i++) {< br > for (var j=0; j < arr[i].length; j++) {< br > console.log(arr[i][j]);< br > }< br > }< / blockquote >
Esto genera cada subelemento en < code > arr< / code > uno a la vez. Tenga en cuenta que para el bucle interno, estamos comprobando la < code > .length< / code > de < code > arr[i]< / code > , ya que < code > arr[i]< / code > es en sí misma una matriz.
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< / section >
## Instructions
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< section id = 'instructions' >
Modificar la función < code > multiplyAll< / code > para que multiplique la variable del < code > product< / code > por cada número en las subarreglas de < code > arr< / code >
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< / section >
## Tests
< section id = 'tests' >
```yml
tests:
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- text: ' < code > multiplyAll([[1],[2],[3]])</ code > debe devolver < code > 6</ code > '
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testString: 'assert(multiplyAll([[1],[2],[3]]) === 6, "< code > multiplyAll([[1],[2],[3]])< / code > should return < code > 6< / code > ");'
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- text: ' < code > multiplyAll([[1,2],[3,4],[5,6,7]])</ code > debe devolver < code > 5040</ code > '
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testString: 'assert(multiplyAll([[1,2],[3,4],[5,6,7]]) === 5040, "< code > multiplyAll([[1,2],[3,4],[5,6,7]])< / code > should return < code > 5040< / code > ");'
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- text: ' < code > multiplyAll([[5,1],[0.2, 4, 0.5],[3, 9]])</ code > debe devolver < code > 54</ code > '
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testString: 'assert(multiplyAll([[5,1],[0.2, 4, 0.5],[3, 9]]) === 54, "< code > multiplyAll([[5,1],[0.2, 4, 0.5],[3, 9]])< / code > should return < code > 54< / code > ");'
```
< / section >
## Challenge Seed
< section id = 'challengeSeed' >
< div id = 'js-seed' >
```js
function multiplyAll(arr) {
var product = 1;
// Only change code below this line
// Only change code above this line
return product;
}
// Modify values below to test your code
multiplyAll([[1,2],[3,4],[5,6,7]]);
```
< / div >
< / section >
## Solution
< section id = 'solution' >
```js
function multiplyAll(arr) {
var product = 1;
for (var i = 0; i < arr.length ; i + + ) {
for (var j = 0; j < arr [ i ] . length ; j + + ) {
product *= arr[i][j];
}
}
return product;
}
multiplyAll([[1,2],[3,4],[5,6,7]]);
```
< / section >