Pushing object into globally declared array in Node.js

Question

I never used global variables in Node.js so I have trouble understanding why this wont work. I am declaring global variable that is array, than I want to push some object into it and for sake of debugging I just want to stringify it. I tried it like this:

var test = require('./api/test'); //my class
global.arrayOfObjects = []; //declaring array
global.arrayOfObjects.push = new test(123); //docs3._id is something I return from db
console.log(JSON.stringify(global.arrayOfObjects)); //I get []

Why did you redefine the .push property to be a new object? Did you mean to call the .push() method? — jfriend00
– jfriend00, Commented Jun 1, 2017 at 1:16

rafascar · Accepted Answer · 2017-06-01 01:16:27Z

5

You have to pass the object you want to push into the array as an argument:

global.arrayOfObjects.push(new test(123));

Array.prototype.push() documentation

answered Jun 1, 2017 at 1:16

rafascar

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Comments

developer_hatch · Accepted Answer · 2017-06-01 01:18:54Z

0

You must do one of this three, you are mixin both:

var test = require('./api/test'); 
//global.arrayOfObjects = []; not need to declare the var here
global.arrayOfObjects = new test(123); from db
console.log(JSON.stringify(global.arrayOfObjects));

or

var test = require('./api/test'); 
global.arrayOfObjects = []; //needed to declare with this option
global.arrayOfObjects.push(1);
global.arrayOfObjects.push(2);
global.arrayOfObjects.push(3);
console.log(JSON.stringify(global.arrayOfObjects));

or

global.arrayOfObjects.push(new test(123)); // I think this is the best option

edited Jun 1, 2017 at 1:18

answered Jun 1, 2017 at 1:16

developer_hatch

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3 Comments

jfriend00 Over a year ago

Why assign global.arrayOfObjects = [] and then immediately assign the same variable something else?

developer_hatch Over a year ago

@jfriend00 I really don't suggest it... but the OP wanted to... maybe I will update the answer with an observation too, thanks

developer_hatch Over a year ago

@jfriend00 I think it is better now, don't you think?

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