$.3.js

// original ofca/$.3.js
// based on https://gist.github.com/Potfur/5576225 & https://github.com/james2doyle/saltjs
// more info: https://plus.google.com/109231487156400680487/posts/63eZzzrBSb6

// 2 bytes less than original ;)

// V1 - 160b
window.$ = function(s,c) {
    c = {
        '#': 'ById',
        '.': 'sByClassName',
        '@': 'sByName',
        '=': 'sByTagName'}[s[0]];
    return document[c?'getElement'+c:'querySelectorAll'](s.slice(1))
};

// V2 - 160b
window.$ = function(s,c) {
    return document[(c = {
        '#': 'ById',
        '.': 'sByClassName',
        '@': 'sByName',
        '=': 'sByTagName'}[s[0]])?'getElement'+c:'querySelectorAll'](s.slice(1))
};

// versions with scope
// $('#id',scope); throws error if scope != document

// based on V1 - 167b
window.$ = function(s,p,c) {
    c = {
        '#': 'ById',
        '.': 'sByClassName',
        '@': 'sByName',
        '=': 'sByTagName'}[s[0]];
    return (p||document)[c?'getElement'+c:'querySelectorAll'](s.slice(1))
};

// based on V2 - 165b
window.$=function(s,c){
    return (c||document)[
                (c={'#':'ById','.':'sByClassName','@':'sByName','=':'sByTagName'}[s[0]])
                ?'getElement'+c
                :'querySelectorAll'
            ](s.slice(1))
};