Class defined in js file, undefined in node.js

Question

I have a bit of code like

var myClass = function(myArray) {
    this.arr = array;    
}
myClass.prototype.myMethod = function () {
     //random code
};

module.exports = myClass;

When I start node from the console, require this file with var a = require('./myClass.js') and try to instantiate my class with

myclass = new myClass([1,2,3]);

what I get is ReferenceError: myClass is not defined. I am building a very small and easy game, I wonder how I would go about testing it and playing around with it from the node console. Thanks.

Show us how are you importing that module. require statement — Zohaib Ijaz
– Zohaib Ijaz, Commented May 14, 2018 at 23:00

Mark · Accepted Answer · 2018-05-14 22:59:21Z

3

When you do this:

 var a = require('./myClass.js')

a becomes the thing you exported from 'myClass.js'. You would need to use it like:

var instance = new a([1, 2, 3])

You can do that, but it's probably easier to read and understand if you use a more descriptive variable name:

var myClass = require('./myClass.js')
// myClass is the function exported in `myClass.js`

var someInstance = new myClass([1,2,3]);

Also, you probably want to use myArray rather than array here:

var myClass = function(myArray) {
    this.arr = myArray // not array;    
}

edited May 14, 2018 at 22:59

answered May 14, 2018 at 22:54

Mark

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1 Comment

Karl Over a year ago

Sure, the array bit was just a random thing i filled in. The problem was the require statement, I think I need to read seriously about how js works.

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