{{alias}}( collection, [options,] predicate )
    Splits values into two groups according to a predicate function.

    When invoked, the predicate function is provided two arguments:

    - `value`: collection value
    - `index`: collection index

    If a predicate function returns a truthy value, a collection value is
    placed in the first group; otherwise, a collection value is placed in the
    second group.

    If provided an empty collection, the function returns an empty array.

    Parameters
    ----------
    collection: Array|TypedArray|Object
        Input collection to group. If provided an object, the object must be
        array-like (excluding strings and functions).

    options: Object (optional)
        Options.

    options.thisArg: any (optional)
        Execution context.

    options.returns: string (optional)
        If `values`, values are returned; if `indices`, indices are returned; if
        `*`, both indices and values are returned. Default: 'values'.

    predicate: Function
        Predicate function indicating which group an element in the input
        collection belongs to.

    Returns
    -------
    out: Array<Array>|Array
        Group results.

    Examples
    --------
    > function predicate( v ) { return v[ 0 ] === 'b'; };
    > var collection = [ 'beep', 'boop', 'foo', 'bar' ];
    > var out = {{alias}}( collection, predicate )
    [ [ 'beep', 'boop', 'bar' ], [ 'foo' ] ]

    // Output group results as indices:
    > var opts = { 'returns': 'indices' };
    > out = {{alias}}( collection, opts, predicate )
    [ [ 0, 1, 3 ], [ 2 ] ]

    // Output group results as index-value pairs:
    > opts = { 'returns': '*' };
    > out = {{alias}}( collection, opts, predicate )
    [ [ [0, 'beep'], [1, 'boop'], [3, 'bar'] ], [ [2, 'foo' ] ] ]

    See Also
    --------