Uncaught TypeError is not a function JavaScript code example

Example 1: Uncaught TypeError is not a function JavaScript

jQuery(document).ready(function($){

    // jQuery code is in here

});

Example 2: uncaught TypeError: $.jajax is not a function

<script src="https://code.jquery.com/jquery-3.1.1.min.js" integrity="sha384-3ceskX3iaEnIogmQchP8opvBy3Mi7Ce34nWjpBIwVTHfGYWQS9jwHDVRnpKKHJg7" crossorigin="anonymous"></script>