repl.txt

{{alias}}( x, predicate[, thisArg] )
    Splits element indices into two groups according to a predicate function.

    When invoked, the predicate function is provided the following arguments:

    - value: current array element.
    - index: current array element index.
    - arr: input array.

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

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

    Parameters
    ----------
    x: ArrayLike
        Input array.

    predicate: Function
        Predicate function specifying which group an element in the input array
        belongs to.

    thisArg: any (optional)
        Predicate function execution context.

    Returns
    -------
    out: Object
        Split results.

    Examples
    --------
    > function fcn( v ) { return v[ 0 ] === 'b'; };
    > var x = [ 'beep', 'boop', 'foo', 'bar' ];
    > var out = {{alias}}( x, fcn )
    [ [ 0, 1, 3 ], [ 2 ] ]

    See Also
    --------