Import JS array values of an external JS array [duplicate]

Question

I previous asked how to import variables values from one JS file into another and perhaps this example may make it more clear as what I am trying to achieve.

   //NumbersFile.js 
   myfirstnumbersarray = new Array();

   myfirstnumbersarray[0] = ThisChangingValue;

Now I have a populated array in my NumbersFile.js (12,89,54,23,11 ...& so on), in a second JS file called AddThemUp.js, I want to import the values of myfirstnumbersarray and perform a simple addition function.

    //AddThemUpFile.js
    //I want to add myfirstnumbersarray[0]+myfirstnumbersarray[3]
    var sum1 = myfirstnumbersarray[0]+myfirstnumbersarray[3];
    (var sum1 should equal 66 (12+54))

How does myfirstnumbersarray get imported into the AddThemUp file.js, thanks....

if you are running this in a browser then include script tags pointing to both files (in order) into your html page — akonsu
– akonsu, Commented Oct 3, 2013 at 19:52
I asked that question as well, found the answers to be web based. However, my app is not web based. — ddawson7
– ddawson7, Commented Oct 3, 2013 at 20:30

dezman · Accepted Answer · 2013-10-03 20:00:17Z

3

If your variables are global, they are already available in every JS file or script tag on your site, no coding necessary. Global vars are attached to the window object, and aren't stuck within a particular file.

If your vars are not global (they are local if defined inside a function) You can pass them to another function in another file, so long as the function is global, or is available within your current scope. (JavaScript uses function scoping).

If you are using Node.js you can just:

var file = require('./yourfile.js');

or for non-js files:

fs = require('fs');
fs.readFile('/etc/hosts', 'utf8', function (err,data) {
  if (err) {
    return console.log(err);
  }
  console.log(data);
});

edited Oct 3, 2013 at 20:00

answered Oct 3, 2013 at 19:52

dezman

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10 Comments

ddawson7 Over a year ago

This isn't a website, it is in an application...Dave

dezman Over a year ago

@ddawson7 -- "A rose by any other name would smell as sweet."

ddawson7 Over a year ago

This is not on a website, this is being used in an application to crunch numbers, no website, no internet involved.....

dezman Over a year ago

Then I suppose you are using Node.js -- which uses require() to get files, like fs = require('fs'); so you can just require() your file and it will be there.

ddawson7 Over a year ago

I do not know how to use Node.js, I do not know how to make my simple example work. I would be grateful if you could write (show me) just how to export values of an array from one JS file into another.

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