In jQuery, the code: $(function() { ... }) is a valid and recommended shortcut for the code: $(document).ready(function() { ... }) code example

Example 1: document ready without jquery

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

Example 2: ondocumentready

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