NodeJS module instances

Question

I have the following code. I want to use the prototype keyword as I want to call method functions and not class methods, why does this give me an error? If I remove the prototype call this works. How can I write this code so I'm able to use instances not class methods?

//app.js
var MyTest = require('./MyTest')
var myTestInstance = new MyTest()
myTestInstance.testFunction(function(reply){
   console.log(reply)
})

//MyTest.js
module.exports = function() {

   function MyTest() {}

   MyTest.prototype.testFunction = function(cb) {
      cb('hello')
   }

   return MyTest

}

@JohnnyHK myTestInstance.testFunction(function(reply){ ^ TypeError: undefined is not a function at Object.<anonymous> — Jonathan Eustace
– Jonathan Eustace, Commented Jul 19, 2015 at 17:26

asa · Accepted Answer · 2015-07-19 17:26:34Z

2

to have your app.js working as it is you need to replace the content of MyTest.js with the following:

function MyTest() {}
MyTest.prototype.testFunction = function(cb) {
  cb('hello');
};
module.exports = MyTest;

As you have it in app.js you need a constructor and not a factory function.

answered Jul 19, 2015 at 17:26

asa

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1 Comment

Jonathan Eustace Over a year ago

Thank you! That actually helped alot.

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