106 lines
2.1 KiB
Markdown
106 lines
2.1 KiB
Markdown
<!--
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@license Apache-2.0
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Copyright (c) 2018 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# Unzip
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> Unzip a [zipped array][@stdlib/utils/zip] (i.e., a nested array of tuples).
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<section class="intro">
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</section>
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<!-- /.intro -->
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<section class="usage">
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## Usage
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```javascript
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var unzip = require( '@stdlib/utils/unzip' );
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```
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#### unzip( arr\[, idx] )
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Unzips a [zipped array][@stdlib/utils/zip] (i.e., a nested `array` of tuples).
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```javascript
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var arr = [ [ 1, 'a', 3 ], [ 2, 'b', 4 ] ];
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var out = unzip( arr );
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// returns [ [ 1, 2 ], [ 'a', 'b' ], [ 3, 4 ] ];
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```
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To unzip specific tuple elements, you can provide an `array` of indices as an optional second argument.
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```javascript
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var arr = [ [ 1, 'a', 3 ], [ 2, 'b', 4 ] ];
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var out = unzip( arr, [ 0, 2 ] );
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// returns [ [ 1, 2 ], [ 3, 4 ] ];
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```
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</section>
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<!-- /.usage -->
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<section class="examples">
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## Examples
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<!-- eslint no-undef: "error" -->
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```javascript
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var unzip = require( '@stdlib/utils/unzip' );
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var round = require( '@stdlib/math/base/special/round' );
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var randu = require( '@stdlib/random/base/randu' );
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var pow = require( '@stdlib/math/base/special/pow' );
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var arr;
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var len;
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var out;
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var i;
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var j;
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arr = new Array( 100 );
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len = 5;
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for ( i = 0; i < arr.length; i++ ) {
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arr[ i ] = new Array( len );
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for ( j = 0; j < len; j++ ) {
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arr[ i ][ j ] = round( randu() * pow(10, j) );
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}
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}
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out = unzip( arr );
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console.dir( out );
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```
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</section>
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<!-- /.examples -->
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<section class="links">
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[@stdlib/utils/zip]: https://www.npmjs.com/package/@stdlib/utils/tree/main/zip
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</section>
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<!-- /.links -->
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