react-native/Libraries/Utilities/groupByEveryN.js
Rubén Norte d5e9e55fa3 Remove @providesModule from all modules
Summary:
This PR removes the need for having the `providesModule` tags in all the modules in the repository.

It configures Flow, Jest and Metro to get the module names from the filenames (`Libraries/Animated/src/nodes/AnimatedInterpolation.js` => `AnimatedInterpolation`)

* Checked the Flow configuration by running flow on the project root (no errors):

```
yarn flow
```

* Checked the Jest configuration by running the tests with a clean cache:

```
yarn jest --clearCache && yarn test
```

* Checked the Metro configuration by starting the server with a clean cache and requesting some bundles:

```
yarn run start --reset-cache
curl 'localhost:8081/IntegrationTests/AccessibilityManagerTest.bundle?platform=android'
curl 'localhost:8081/Libraries/Alert/Alert.bundle?platform=ios'
```

[INTERNAL] [FEATURE] [All] - Removed providesModule from all modules and configured tools.
Closes https://github.com/facebook/react-native/pull/18995

Reviewed By: mjesun

Differential Revision: D7729509

Pulled By: rubennorte

fbshipit-source-id: 892f760a05ce1fddb088ff0cd2e97e521fb8e825
2018-04-25 07:37:10 -07:00

50 lines
1.1 KiB
JavaScript

/**
* Copyright (c) 2015-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
*/
/**
* Useful method to split an array into groups of the same number of elements.
* You can use it to generate grids, rows, pages...
*
* If the input length is not a multiple of the count, it'll fill the last
* array with null so you can display a placeholder.
*
* Example:
* groupByEveryN([1, 2, 3, 4, 5], 3)
* => [[1, 2, 3], [4, 5, null]]
*
* groupByEveryN([1, 2, 3], 2).map(elems => {
* return <Row>{elems.map(elem => <Elem>{elem}</Elem>)}</Row>;
* })
*/
'use strict';
function groupByEveryN<T>(array: Array<T>, n: number): Array<Array<?T>> {
var result = [];
var temp = [];
for (var i = 0; i < array.length; ++i) {
if (i > 0 && i % n === 0) {
result.push(temp);
temp = [];
}
temp.push(array[i]);
}
if (temp.length > 0) {
while (temp.length !== n) {
temp.push(null);
}
result.push(temp);
}
return result;
}
module.exports = groupByEveryN;