Something I wish was in ES6

autocast-params.js

jQuery.prototype.fromObject = function(object) {
    if (object instanceof jQuery) {
        return object;
    }

    return $(object);
}

function handlejQueryObject(jQuery object) {
    // object will always be a jquery rep of the body element
};

handlejQueryObject('body');
handlejQueryObject(document.body);
handlejQueryObject($('body'));
handlejQueryObject($(document.body));

es5.js

// This is how you'd do it in ES5.
function handlejQueryObject(object) {
  if (!(object instanceof jQuery)) {
    object = $(object);
  }
}