When i use jQuery version 3.0 or higher, slick slider is not working.
Having this issue as well, any update on when this will be compatible with jQuery 3, thanks!
Merged a fix into the new master. You can grab that. There's another issue on this subject if you'd like to learn more about the breaking changes to jQuery.
I did grab it, still no luck. Using the master repo, I changed jquery from 2.2.0 to 3.1.0 and the sliders stopped working.
Can you recreate in a fiddle or codepen?
https://jsfiddle.net/7gaw3hra/
i didnt change anything except the JS on line 133
Check the console for errors
No errors. Works fine when I change it back to 2.2.0.

Anyway it works here with jQuery edge: https://jsfiddle.net/simeydotme/fmo50w7n/
So I figured out the problem with your implementation. The reason slick broke w/ jquery 3 is because we used on ready which you are using in your code.
$(document).on('ready', function() { ... }
Thank you that works! Sorry, I literally pulled the repo and only changed the version of jQuery in the index.html.
<!DOCTYPE html>
<html>
<head>
<title>Slick Playground</title>
<meta charset="UTF-8">
<link rel="stylesheet" type="text/css" href="./slick/slick.css">
<link rel="stylesheet" type="text/css" href="./slick/slick-theme.css">
<style type="text/css">
html,
body {
margin: 0;
padding: 0;
}
* {
box-sizing: border-box;
}
.slider {
width: 50%;
margin: 100px auto;
}
.slick-slide {
margin: 0px 20px;
}
.slick-slide img {
width: 100%;
}
.slick-prev:before,
.slick-next:before {
color: black;
}
.slick-slide {
transition: all ease-in-out .3s;
opacity: .2;
}
.slick-active {
opacity: .5;
}
.slick-current {
opacity: 1;
}
</style>
</head>
<body>
<section class="regular slider">
<div>
<img src="http://placehold.it/350x300?text=1">
</div>
<div>
<img src="http://placehold.it/350x300?text=2">
</div>
<div>
<img src="http://placehold.it/350x300?text=3">
</div>
<div>
<img src="http://placehold.it/350x300?text=4">
</div>
<div>
<img src="http://placehold.it/350x300?text=5">
</div>
<div>
<img src="http://placehold.it/350x300?text=6">
</div>
</section>
<script src="http://code.jquery.com/jquery-3.3.1.js" integrity="sha256-2Kok7MbOyxpgUVvAk/HJ2jigOSYS2auK4Pfzbm7uH60="
crossorigin="anonymous"></script>
<script src="./slick/slick.min.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
$(".regular").slick({
dots: true,
infinite: true,
slidesToShow: 3,
slidesToScroll: 3
});
</script>
</body>
</html>
CHANGE JS
<script type="text/javascript">
$(".regular").slick({
dots: true,
infinite: true,
slidesToShow: 3,
slidesToScroll: 3
});
</script>
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