
{{alias}}( collection, [options,] indicator )
    Generates a frequency table according to an indicator function.

    When invoked, the indicator function is provided two arguments:

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

    The table is an array of arrays where each sub-array corresponds to a unique
    value in the input collection. Each sub-array is structured as follows:

    - 0: unique value
    - 1: value count
    - 2: frequency percentage

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

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

    options: Object (optional)
        Options.

    options.thisArg: any (optional)
        Execution context.

    indicator: Function
        Indicator function specifying how to categorize a collection element.

    Returns
    -------
    out: Array<Array>|Array
        Frequency table.

    Examples
    --------
    > function indicator( value ) { return value[ 0 ]; };
    > var collection = [ 'beep', 'boop', 'foo', 'beep' ];
    > var out = {{alias}}( collection, indicator )
    [ [ 'b', 3, 0.75 ], [ 'f', 1, 0.25 ] ]

    See Also
    --------

