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stdlib/lib/node_modules/@stdlib/utils/unzip at develop · stdlib-js/stdlib

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 discreteUniform = require( '@stdlib/random/base/discrete-uniform' );
var filled2dBy = require( '@stdlib/array/base/filled2d-by' );
var unzip = require( '@stdlib/utils/unzip' );

function random( indices ) {
    var j = indices[ 1 ] * 100;
    return discreteUniform( j, j+100 );
}

var arr = filled2dBy( [ 100, 5 ], random );
console.dir( arr );

var out = unzip( arr );
console.dir( out );

See Also