CODEWITHSUNDEEP
javascriptnode.jssingleton
user3794529
user3794529

Reputation: 77

Nodejs: Global variables across multiple files

I have written my code across several files for my node server.

If I have a file, say basket.js:

var Basket = {
    fruits : 0,
    
    addFruit : function() {
        fruits++;
    },

    removeFruit : function() {
        fruits--;
    },

    printFruit : function() {
        console.log(this.fruits);
    }
}
module.export = Basket;

And I have another file called give.js:

var Basket1 = require("./basket.js");

Basket1.addFruit();
Basket1.printFruit();

And another file called take.js:

var Basket2 = require("./basket.js");

Basket2.removeFruit();
Basket2.printFruit();

Will both files write into the same instance of Basket? In other words, will they both have control over the property, fruits? Does node manage race conditions on its own? i.e. if two commands to modify fruit come in at the same time from add and sub, does node know how to handle it?

If I want to make a way in which two files can look at a singleton at the same time and access it, is this the way to go?? Or how else does one do it?

Upvotes: 3

Views: 5510

Answers (2)

GBill
GBill

Reputation: 21

I'm a beginner but I think the correct syntax is module.exports not modules.export - if you may correct so that people don't wonder why it does not work like I just did :)

Upvotes: 2

Andreas Hultgren
Andreas Hultgren

Reputation: 14953

Yes, they will access the same object.

Modules are cached after the first time they are loaded. This means (among other things) that every call to require('foo') will get exactly the same object returned, if it would resolve to the same file.

– Modules docs

No, node does not manage race conditions on its own, because race conditions will not be caused by node itself. Node is single-threaded and thus no code can be executed at the same time as other code. See for example this answer for some more explanation.

Upvotes: 5

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