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How do I call a simple addition function and assert the result of two values using selenium-cucumber-js framework with a test written below. While running the below it says
TypeError: TypeError: Cannot read property 'addvalues' of undefined
at createWorld.When (C:Testscucumberstep-definitionsaddvalues-steps.js:5:25)

Feature:
 Scenario: Addition of two values 
 When Add two values 5 and 10
 Then I should get result 15

// Here is my 'addvalues-steps.js' file

const expect = require('chai').expect;
module.exports = function () 

 this.When(/^Add two values (-?d+) and (-?d+)$/, (x, y) =>
 this.page.addvalues.addValues(x,y); 
 )

 this.Then(/^I should get result (-?d+)$/, (ans) =>
 let tot = this.page.addvalues.addValues(x, y); 
 expect(tot).to.be.eql(ans); 
 )
;

// Following is my 'addvalues.js file'

module.exports = 
 addValues(x,y)
 var total = x + y ; 
 return total ; 
 
;

// world.js >>

const CustomWorld = require('cucumber')
function CustomWorld() 
 console.log('overriding the world')
 this.page = 
 addvalues: require('../page-objects/addvalues')
 
 console.log("This is the recent error log:"+this.page.addvalues) 



module.exports = function() {
 this.World = CustomWorld;

Note: the below example is for an old version of cucumber-js: 1.3.3.
With cucumber.js, when you're referencing this from inside step definitions, you're actually referencing the World context. So, for this.page.addvalues.addValues(x,y); to work properly, you'll first need to create page that has a reference to your addvalues.js. Something along these lines:

world.js:

function CustomWorld() 
 console.log('overriding the world')
 this.page = 
 addvalues: require('../page-objects/addvalues')
 


module.exports = function() 
 this.World = CustomWorld;
;

addvalues.js:

//addvalues.js
module.exports = 
 addValues(x,y)
 var total = x + y ;
 return total ;
 
;

There's also a couple of things to correct in your steps.js.

1. Don't pass arrow functions into the steps, as this will remove the this context that you're setting in World.js.


2. If you want to share variables between steps (as you do in your example), you need to store them somewhere. One such place, again, would be the World context. Note how in my version I set this.prevResult
   


3. When the variables are injected into your steps, they are injected as strings. Note the parseInt() in my version.

addvalues-steps.js:

const expect = require('chai').expect;

module.exports = function() 
 this.When(/^Add two values (-?d+) and (-?d+)$/, function (x, y) 
 this.prevResult = this.page.addvalues.addValues(parseInt(x, 10), parseInt(y, 10));
 )

 this.Then(/^I should get result (-?d+)$/, function (ans) 
 let tot = this.prevResult;
 expect(tot).to.be.eql(parseInt(ans, 10));
 )

UPD: It turns out that the question is about selenium-cucumber-js, which is a framework on top of cucumber-js. Disregard the comments about the world.js.

According to selenium-cucumber-js docs, you don't need this to access the page objects in your step definitions:

Page objects are accessible via a global page object and are
automatically loaded from ./page-objects.

const expect = require('chai').expect;

module.exports = function() 
 this.When(/^Add two values (-?d+) and (-?d+)$/, function (x, y) 
 this.prevResult = page.addvalues.addValues(parseInt(x, 10), parseInt(y, 10));
 )

 this.Then(/^I should get result (-?d+)$/, function (ans) 
 let tot = this.prevResult;
 expect(tot).to.be.eql(parseInt(ans, 10));
 )