math_exampl3/lib/simple_math.js

An example of creating a package

// JavaScript source code
var call_counter = require('./call_counter');

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


function substract(x, y) {
    call_counter();
    return x - y;
}

module.exports = {
    addition: add,
    substraction: substract
}