CODEWITHSUNDEEP
javascriptnode.js
Quinton M.
Quinton M.

Reputation: 154

What method to export various functions in node?

So I am building a database layer and am exposing your standard CRUD (Create, Read, Update, Delete) operations as functions. I'm toiling over which way to export each function.

Method 1

function func1 () {}
function func2 () {}

module.exports = {
    "func1": func1,
    "func2": func2
}

Method 2

var exporting;
exporting.func1 = function() {};
exporting.func2 = function() {};

module.exports = exporting;

or, to just do it directly:

module.exports.func1 = function() {};
module.exports.func2 = function() {};

Method 3

export func1 = function() {}
export func2 = function() {}

I'm sure it wont break things on any method, but what are the pros and cons (if any) of each?

Upvotes: 4

Views: 69

Answers (1)

user7126329
user7126329

Reputation:

According with your examples, the example #1 and #2 are the same thing since exports is an object. You only are changing the way of add entries to this object.

This:

const object = {};
object.func1 = function () { return 'hello'; };
object.func2 = function () { return 'bye'; };

You can write like this:

const object = {
  func1: function () { return 'hello'; },
  func2: function () { return 'bye'; }
};

The last example owns to ES2015 modules and is not implemented yet in V8 (in which Node.js runs). For this example you need the packages babel and babel-preset-es2015.

However, there is a important difference between using CommonJS and ES2015 modules:

CommonJS modules export values, while ES6 modules export immutable bindings. That means: CommonJS export a copy of the module while ES2015 modules export a reference of it.

See: What do ES6 modules export? | 2ality.com

Upvotes: 3

Related Questions