function bunary2d( arrays, shapes, fcn ) {
	var dx0;
	var dx1;
	var S0;
	var S1;
	var i0;
	var i1;
	var j0;
	var j1;
	var x0;
	var y0;
	var sh;
	var st;
	var o;
	var x;
	var y;

	sh = shapes[ 1 ];
	S0 = sh[ 1 ];
	S1 = sh[ 0 ];
	if ( S0 <= 0 || S1 <= 0 ) {
		return;
	}
	o = broadcastArray( arrays[ 0 ], shapes[ 0 ], sh );
	x = o.data;
	st = o.strides;
	dx0 = st[ 1 ];
	dx1 = st[ 0 ];

	y = arrays[ 1 ];

	j1 = 0;
	for ( i1 = 0; i1 < S1; i1++ ) {
		j0 = 0;
		x0 = x[ j1 ];
		y0 = y[ i1 ];
		for ( i0 = 0; i0 < S0; i0++ ) {
			y0[ i0 ] = fcn( x0[ j0 ] );
			j0 += dx0;
		}
		j1 += dx1;
	}
}
Applies a unary callback to elements in a broadcasted nested input array and assigns results to elements in a two-dimensional nested output array.

@param {ArrayLikeObject<Array<Collection>>} arrays - array-like object containing one input nested array and one output nested array
@param {ArrayLikeObject<NonNegativeIntegerArray>} shapes - array shapes
@param {Callback} fcn - unary callback
@returns {void}

@example
var ones2d = require( '@stdlib/array/base/ones2d' );
var zeros2d = require( '@stdlib/array/base/zeros2d' );

function scale( x ) {
    return x * 10.0;
}

var shapes = [
    [ 1, 2 ],
    [ 2, 2 ]
];

var x = ones2d( shapes[ 0 ] );
var y = zeros2d( shapes[ 1 ] );

bunary2d( [ x, y ], shapes, scale );

console.log( y );
// => [ [ 10.0, 10.0 ], [ 10.0, 10.0 ] ]