In Node.js, how do I “include” functions from my other files?

Question

Let\'s say I have a file called app.js. Pretty simple:

var express = require(\'express\');
var app = express.createServer();
app.set(\'views\', __dirname + \         


        

Answer 1

create two files e.g standard_funcs.js and main.js

1.) standard_funcs.js

// Declaration --------------------------------------

 module.exports =
   {
     add,
     subtract
     // ...
   }


// Implementation ----------------------------------

 function add(x, y)
 {
   return x + y;
 }

 function subtract(x, y)
 {
   return x - y;
 }
    

// ...

2.) main.js

// include ---------------------------------------

const sf= require("./standard_funcs.js")

// use -------------------------------------------

var x = sf.add(4,2);
console.log(x);

var y = sf.subtract(4,2);
console.log(y);

    

output

6
2