{{alias}}( arr[, idx] )
    Unzips a zipped array (i.e., a nested array of tuples).

    Parameters
    ----------
    arr: Array
        Zipped array.

    idx: Array<number> (optional)
        Array of indices specifying which tuple elements to unzip.

    Returns
    -------
    out: Array
        Array of unzipped arrays.

    Examples
    --------
    // Basic usage:
    > var arr = [ [ 1, 'a', 3 ], [ 2, 'b', 4 ] ];
    > var out = {{alias}}( arr )
    [ [ 1, 2 ], [ 'a', 'b' ], [ 3, 4 ] ]

    // Provide indices:
    > arr = [ [ 1, 'a', 3 ], [ 2, 'b', 4 ] ];
    > out = {{alias}}( arr, [ 0, 2 ] )
    [ [ 1, 2 ], [ 3, 4 ] ]

    See Also
    --------