CODEWITHSUNDEEP
javascriptnode.js
gldanoob
gldanoob

Reputation: 792

Functions in Node.js modules

I can define a module in node.js:
mymodule.js

exports.bar = "Hello";
exports.foo = function(){
    console.log(exports.bar);
}

I can require the module:
app.js

var baz = require("./mymodule.js");
baz.foo(); //Logs "Hello" in the console

If I call the foo function as above, it logs "Hello" in the console. However, the variable that foo is logging is exports.bar, not baz.bar. Does Node.js automatically know to switch them or the exports object still exists?

Upvotes: 0

Views: 55

Answers (2)

Muhammad Usman
Muhammad Usman

Reputation: 10148

exports is a special object which is included in every JS file in the Node.js application by default.

So anything you export in a file (mymodule.js in your case) is a property on this object and when you require this module export object is assigned to the requiring object (baz in your case).

When you do 

var baz = require("./mymodule.js");

Your baz variable now looks like something 

baz = {
    bar : "Hello",
    foo : () => {
        console.log(baz.bar)
     }
}

And when you call baz.foo() you see "Hello" printed

Upvotes: 2

Vora Ankit
Vora Ankit

Reputation: 722

When you use exports in the module, This will add property to the object and will use it as just like local object(variable).

Upvotes: 0

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