document.ready event

document.addEventListener("DOMContentLoaded", function() {
  // code
});

$( document ).ready(function() {
    console.log( "ready!" );
});

document.addEventListener("DOMContentLoaded", function(event) { 
  //we ready baby
});

$(function(){
  // equal to $( document ).ready(function() {
});
  

// A $( document ).ready() block.
$( document ).ready(function() {
    console.log( "ready!" );
});

  
    $(document).ready(function(){
  $("button").click(function(){
    $("p").slideToggle();
  });
 });