mighty-dollar-sign-function.js

function $(el) {
    const type = el.charAt(0);
    switch (type) {
        case "#":
            return document.querySelector(el);
            break;
        case ".":
            return document.querySelectorAll(el);
            break;
        default:
            return document.getElementsByTagName(el);
    }
}

mighty-dollar-sign-function.min.js

function $(e){switch(e.charAt(0)){case"#":return document.querySelector(e);case".":return document.querySelectorAll(e);default:return document.getElementsByTagName(e)}}