Unzip

Unzip a zipped array (i.e., a nested array of tuples).

Usage

var unzip = require( '@stdlib/utils/unzip' );

unzip( arr[, idx] )

Unzips a zipped array (i.e., a nested array of tuples).

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.

var arr = [ [ 1, 'a', 3 ], [ 2, 'b', 4 ] ];

var out = unzip( arr, [ 0, 2 ] );
// returns [ [ 1, 2 ], [ 3, 4 ] ];

Examples

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 );