Include a module in NodeJS

Question

How to include the following`MathModule.js` module in the main file? :

```javascript
// MathModule.js
module.exports = function () {
  return {
    addition       : (a, b) => a + b,
    soustration    : (a, b) => a - b,
    multiplication : (a, b) => a * b,
    division       : (a, b) => a / b
  };
};
```

Accepted Answer

`const MathModule = require('./MathModule.js');`

Answer

`const MathModule = include('./MathModule.js');`

Answer

`const MathModule = import('./MathModule.js');`

Answer

`const MathModule = require_once('./MathModule.js');`

Question from the Node.js test

Include a module in NodeJS