Works in JSFiddle not in browser and '$ is not a function - wordpress

Question

I have this little snippet of code that works great in JSFiddle and in a Chrome extension. On clicking "button" it blurs the ID "content".
var dimthis = $("#content")
var button = $("button")
button.on("click", () => {
dimthis.toggleClass("alt")
});
I've been through quite a few of the similar question that say to add $(document).ready(function(){
before and this });`
at the end giving this
$(document).ready(function(){
var dimthis = $("#content")
var button = $("button")
button.on("click", () => {
dimthis.toggleClass("alt")
});
});
That has worked for me before but not helping with this little ditty of code.
When I add the second set of code I get "$ is not a function error"
Thanks in advance for the help.
***** ANSWER (since I can't post answers for some reason) ******
This is a Wordpress site and Wordpress uses jQuery.noConflict();
So, in Wordpress, $ is undefined ergo the message "$ is not a function error"
Instead of
$(document).ready(function(){
in Wordpress you need to use
jQuery(document).ready(function($) {
What worked is putting it in the child-themes funtion.php like this:
function load_dimmer_script(){
?>
<script>
jQuery(document).ready(function($) {
var dimthis = $("#content")
var button = $("button")
button.on("click", () => {
dimthis.toggleClass("alt")
});
});
</script>
<?php
}
add_action( 'wp_footer', 'load_dimmer_script' );
What this does is this: If the menu toggle is defined as a button, when the menu is clicked the content of the page (#content) gets blurred. Click menu toggle again, it goes unblurred.
See nova-energy.net
Here's the one piece of CSS needed:
#content.alt {
filter: blur(4px) !important;
}

Answer 1

You have to wrap the JS code:
jQuery(document).ready(function($) {
// your code
)};