math_exampl3/lib/advanced_math.js

An example of creating a package

// JavaScript source code

var call_counter = require('./call_counter');

function multiply(x, y) {
    call_counter();
    return x * y;
}

function divide(x, y) {
    call_counter();
    return x / y;
}


function fibo(count) {
    call_counter();
    return private_fibo(count);
}

function private_fibo(count, counter, first, second) {
    if (count == 0) { return 0; }
    if (counter == undefined) {
        counter = 1;
        first = 1;
        second = 2;
    }
    var result = first + second;
    if (counter == count) { return result };
    private_fibo(count, ++counter, second, result);
    return result;
}

module.exports = {
    multiplication: multiply,
    division: divide,
    fibonacci: fibo
}