{{alias}}( iterator, fcn[, thisArg] )
    Returns an iterator which replicates each iterated value according to a
    provided function.

    The callback function is provided three arguments:

    - value: iterated value.
    - index: source iteration index (zero-based).
    - n: iteration index (zero-based).

    The callback function is invoked *once* per iterated value of the provided
    iterator.

    The callback function *must* return an integer value. If the return value is
    less than or equal to zero, the returned iterator skips an iterated value
    and invokes the callback for the next iterated value of the provided
    iterator.

    If an environment supports Symbol.iterator and a provided iterator is
    iterable, the returned iterator is iterable.

    Parameters
    ----------
    iterator: Object
        Input iterator.

    fcn: Function
        Function which returns the number of times an iterated value should be
        replicated.

    thisArg: any (optional)
        Callback function execution context.

    Returns
    -------
    iterator: Object
        Iterator.

    iterator.next(): Function
        Returns an iterator protocol-compliant object containing the next
        iterated value (if one exists) and a boolean flag indicating whether the
        iterator is finished.

    iterator.return( [value] ): Function
        Finishes an iterator and returns a provided value.

    Examples
    --------
    > var it1 = {{alias:@stdlib/array/to-iterator}}( [ 1, 2, 3, 4 ] );
    > function f( v, i ) { return i + 1; };
    > var it2 = {{alias}}( it1, f );
    > var v = it2.next().value
    1
    > v = it2.next().value
    2
    > v = it2.next().value
    2
    > v = it2.next().value
    3
    > v = it2.next().value
    3
    > v = it2.next().value
    3
    > v = it2.next().value
    4

    See Also
    --------