
{{alias}}( x, mask, fcn[, thisArg] )
    Applies a mask to a provided input array and returns a new array after
    applying a mapping function.

    If a mask array element is truthy, the corresponding element in `x` is
    included in the output array; otherwise, the corresponding element in `x`
    is "masked" and thus excluded from the output array.

    Parameters
    ----------
    x: ArrayLikeObject
        Input array.

    mask: ArrayLikeObject
        Mask array.

    fcn: Function
        Function to apply.

    thisArg: any (optional)
        Function execution context.

    Returns
    -------
    out: Array
        Output array.

    Examples
    --------
    > var x = [ 1, -2, -3, 4 ];
    > var y = {{alias}}( x, [ 0, 1, 0, 1 ], {{alias:@stdlib/math/base/special/abs}} )
    [ 2, 4 ]


{{alias}}.assign( x, mask, out, stride, offset, fcn[, thisArg] )
    Applies a mask and mapping function to a provided input array and assigns
    results to elements in a provided output array.

    If a mask array element is truthy, the corresponding element in `x` is
    included in the output array; otherwise, the corresponding element in `x`
    is "masked" and thus excluded from the output array.

    Parameters
    ----------
    x: ArrayLikeObject
        Input array.

    mask: ArrayLikeObject
        Mask array.

    out: ArrayLikeObject
        Output array.

    stride: integer
        Output array stride.

    offset: integer
        Output array offset.

    fcn: Function
        Function to apply.

    thisArg: any (optional)
        Function execution context.

    Returns
    -------
    out: ArrayLikeObject
        Output array.

    Examples
    --------
    > var x = [ -1, -2, -3, -4 ];
    > var m = [ 0, 1, 0, 1 ];
    > var out = [ 0, 0, 0, 0 ];
    > var arr = {{alias}}.assign( x, m, out, 2, 0, {{alias:@stdlib/math/base/special/abs}} )
    [ 2, 0, 4, 0 ]
    > var bool = ( arr === out )
    true

    See Also
    --------

