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function loadScript(url,callback) {
  var element = document.createElement("script"); 
  element.src = url; 
  document.body.appendChild(element); 
  element.onload = callback;
  return element;
}

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function Enum(items, startingValue) {
    var count = startingValue || 0,
        item;
    for (var i = 0; i < items.length && (item = items[i]) ; i++) {
        var splitted = item.split(':');
        if (splitted.length == 2) {
            count = Number(splitted[0]);
            item = splitted[1];
        }
        this[this[item] = count++] = item;

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-- COMING SOON

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// ==UserScript==
// @name         Useful Scripts
// @version      1.3.0
// @description  Useful scripts for developers, to be loaded and used in every page
// @match        http://**/*
// @author       Guilherme Ventura
// @downloadURL  https://rawgit.com/danguilherme/2e6e913ebdd491b06225/raw/useful_scripts.user.js
// @grant        unsafeWindow
// ==/UserScript==
 

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# BRANCHES
git branch # list all local branches
git branch -a # list all branches (local and remote)
# Clone remote branches - http://stackoverflow.com/a/72156/1574059
git checkout -b branch-name origin/branch-name # create local branch and set it to track origin/branch-name

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e.=explorer .
gl=git log --oneline --all --graph --decorate  $*
ls=ls --color $*
pwd=cd
clear=cls

subl="C:\Program Files\Sublime Text 3\subl.exe" $*
atom="C:\Users\Guilherme\AppData\Local\atom\app-1.0.0\atom.exe" $*
eval=node -p $*

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git config --global user.name "Guilherme Ventura"
git config --global user.email "[email protected]"

git config --global push.default simple

git config --global color.ui true

git config --global alias.s status
git config --global alias.c checkout
git config --global alias.co checkout

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# Create a symbolic link to conveniently run $app from the terminal:
sudo ln -s /path/to/$app /usr/local/bin/$app

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# good read: https://www.howtogeek.com/howto/16226/complete-guide-to-symbolic-links-symlinks-on-windows-or-linux/
cd C:\bin
mklink cmder.exe C:\tools\cmder\Cmder.exe # creates a symlink to the binary, with no .lnk
mklink curl.exe C:\tools\curl-7.53.1-win64-mingw\bin\curl.exe
# para pastas
mklink /J gludum "C:\Users\Guilherme Ventura\git\gludum\gludum\"

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And the famous answer is: it depends. Depends on the use case.

Use case #1: Optional parameters

If the parameters are optional, you may use a single parameter (generally named options) to receive and conditionally Object.assign the default values (mostly used in pre-ES6 code, but still has its use).

jQuery uses this approach in lots of functions. Here's an example from Angular's $http.get:

// No params
$http.get('https://httpbin.org/get');

// Optional params