const functs = require('functs');

//create some functions
function f1(first){
  console.log('Welcome', first);
}
function f2(first, second){
  console.log('world', second);
}

//merge them into one function
const a = functs(f1, f2);

//run it
a('in the', 'of internet!'); //=> 'Welcome in the world of internet!'

const functs = require('functs');
const a = functs();

//you can add functions to a functs object by passing them to the creator
const b = functs(() => {
  return 'function 1';
}, () => {
  return 'function 2';
});

//the other way to add functions is the .add method
b.add(() => {
  return 'function 3';
});

//to remove a function you need to pass the function itself to the .remove method
const key = b.add(() => {
  return 'function 4';
});
b.remove(key);

//since the functs-object is a function the execution is simple: just run it.
b();

const functs = require('functs');

//create a new functs-object
var a = functs();

//add functions
a.add(() => {
  console.log('hi');
}, () => {
  console.log('foo');
});

//run the added functions
a();

const functs = require('functs');

//create a new functs-object
var a = functs(errorHandler, doSomething);

function errorHandler(error, result, abort) {
  if(error) {
    console.log('error:', error);

    //do not continue if an error occurs
    abort();
  }
}
function doSomething(error, result) {
  //this only gets executed when the errorHandler does not call abort
  console.log('Yayy! Got some result:', result);
}

//run the functions in the Functs-object

a(null, 'nice result');
//this will log: 'Yayy! Got some result: nice result'

a('extremely critical error');
//this will log: 'error: extremely critical error'