JSFiddle - React, Tailwind, and code Playground

HTML

<div class="foo"></div>
<div class="bar"></div>
<p class="foo"></p>
<p class="foo"></p>

JavaScript

$(function() {
    $.fn.all = function(selector) {
        return this.filter(selector).length == this.length;
    }
        
    alert("div.all(.foo) = " + $("div").all(".foo"));
    alert("p.all(.foo) = " + $("p").all(".foo"));

});