function map2Right( x, y, z, fcn, thisArg ) {
	var xbuf;
	var ybuf;
	var zbuf;
	var xget;
	var yget;
	var zset;
	var i;

	// Cache references to the input and output data:
	xbuf = x.data;
	ybuf = y.data;
	zbuf = z.data;

	// Cache accessors:
	xget = x.accessors[ 0 ];
	yget = y.accessors[ 0 ];
	zset = z.accessors[ 1 ];

	// Iterate over the elements...
	for ( i = xbuf.length-1; i >= 0; i-- ) {
		zset( zbuf, i, fcn.call( thisArg, xget( xbuf, i ), yget( ybuf, i ), i, [ xbuf, ybuf ] ) ); // eslint-disable-line max-len
	}
}
Applies a function to elements in two input arrays while iterating from right to left and assigns the results to an output array.

@private
@param {Object} x - object containing data for the first input array
@param {ArrayLikeObject} x.data - array data
@param {Array<Function>} x.accessors - array element accessors
@param {Object} y - object containing data for the second input array
@param {ArrayLikeObject} y.data - array data
@param {Array<Function>} y.accessors - array element accessors
@param {Object} z - object containing output array data
@param {ArrayLikeObject} z.data - array data
@param {Array<Function>} z.accessors - array element accessors
@param {Function} fcn - function to apply
@param {*} thisArg - function execution context
@returns {void}

@example
var naryFunction = require( '@stdlib/utils/nary-function' );
var add = require( '@stdlib/number/float64/base/add' );

// Define getters and setters:
function getter( buf, idx ) {
    return buf[ idx ];
}

function setter( buf, idx, value ) {
    buf[ idx ] = value;
}

// Create the input and output array objects:
var x = {
    'data': [ 1, 2, 3, 4, 5, 6 ],
    'accessors': [ getter, setter ]
};
var y = {
    'data': [ 1, 1, 1, 1, 1, 1 ],
    'accessors': [ getter, setter ]
};
var z = {
    'data': [ 0, 0, 0, 0, 0, 0 ],
    'accessors': [ getter, setter ]
};

map2Right( x, y, z, naryFunction( add, 2 ) );

var data = z.data;
// returns [ 2, 3, 4, 5, 6, 7 ]