How callback use in this case

[Manpreet Gill]

this file is example.js:= module.exports = {
	dashboarddistance: function(a, b, c, d, callback) {
	var ds = 0;
	var distance = require('google-distance');
	distance.get({
	index: 1,
	origin: a + ',' + b,
	destination: c + ',' + d
	}, function(err, data) {
	if (err) {
	console.log("a");
	ds = 0;
	return callback(err, ds);
	} else {
	console.log("b");
	ds = data.distance;
	return callback(null, ds);
	}
	});
	},
	}; main.js file this := var example = require('./example.js'); example.dashboarddistance(a, b, c, d, function(err, distance) { if (err) { // dosomething and return return ; } console.log(distance); });

[Ryan Schmidt]

I would put

var distance = require('google-distance');

outside of the function, outside of the module.exports object.

Other than that, what's your question about this code?