function binary2d( arrays, shape, fcn ) {
	var S0;
	var S1;
	var i0;
	var i1;
	var x0;
	var y0;
	var z0;
	var x;
	var y;
	var z;

	S0 = shape[ 1 ];
	S1 = shape[ 0 ];
	if ( S0 <= 0 || S1 <= 0 ) {
		return;
	}
	x = arrays[ 0 ];
	y = arrays[ 1 ];
	z = arrays[ 2 ];
	for ( i1 = 0; i1 < S1; i1++ ) {
		x0 = x[ i1 ];
		y0 = y[ i1 ];
		z0 = z[ i1 ];
		for ( i0 = 0; i0 < S0; i0++ ) {
			z0[ i0 ] = fcn( x0[ i0 ], y0[ i0 ] );
		}
	}
}
Applies a binary callback to elements in two two-dimensional nested input arrays and assigns results to elements in a two-dimensional nested output array.

## Notes

-   The function assumes that the input and output arrays have the same shape.

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

@example
var ones2d = require( '@stdlib/array/base/ones2d' );
var zeros2d = require( '@stdlib/array/base/zeros2d' );
var add = require( '@stdlib/number/float64/base/add' );

var shape = [ 2, 2 ];

var x = ones2d( shape );
var y = ones2d( shape );
var z = zeros2d( shape );

binary2d( [ x, y, z ], shape, add );

console.log( z );
// => [ [ 2.0, 2.0 ], [ 2.0, 2.0 ] ]