matematicabisao83/lib/contadorDeChamadas.js

Um exemplo de projeto node com operações matemáticas

// It looks like the internal_call_counter variable and the count_call function are polluting the global namespace, but this module
// code will be wrapped so that neither will be in the global namespace. You can define what is available when a user uses the
// require(‘call_counter’) function by assigning something to module.exports. In this case, the only exported function is count_call, 
// but you can specify multiple functions by wrapping them in an object, as you’ll see in the simple_math.js and advanced_math.js modules. 

var internal_call_counter = 0;

function count_call(){
    ++internal_call_counter;
    console.log('You have made ' + internal_call_counter + ' calls!');
}

module.exports = count_call;