# Unzip
> Unzip a [zipped array][@stdlib/utils/zip] (i.e., a nested array of tuples).
## Usage
```javascript
var unzip = require( '@stdlib/utils/unzip' );
```
#### unzip( arr\[, idx] )
Unzips a [zipped array][@stdlib/utils/zip] (i.e., a nested `array` of tuples).
```javascript
var arr = [ [ 1, 'a', 3 ], [ 2, 'b', 4 ] ];
var out = unzip( arr );
// returns [ [ 1, 2 ], [ 'a', 'b' ], [ 3, 4 ] ];
```
To unzip specific tuple elements, you can provide an `array` of indices as an optional second argument.
```javascript
var arr = [ [ 1, 'a', 3 ], [ 2, 'b', 4 ] ];
var out = unzip( arr, [ 0, 2 ] );
// returns [ [ 1, 2 ], [ 3, 4 ] ];
```
## Examples
```javascript
var unzip = require( '@stdlib/utils/unzip' );
var round = require( '@stdlib/math/base/special/round' );
var randu = require( '@stdlib/random/base/randu' );
var pow = require( '@stdlib/math/base/special/pow' );
var arr;
var len;
var out;
var i;
var j;
arr = new Array( 100 );
len = 5;
for ( i = 0; i < arr.length; i++ ) {
arr[ i ] = new Array( len );
for ( j = 0; j < len; j++ ) {
arr[ i ][ j ] = round( randu() * pow(10, j) );
}
}
out = unzip( arr );
console.dir( out );
```
[@stdlib/utils/zip]: https://www.npmjs.com/package/@stdlib/utils/tree/main/zip