$(function(){
$(".gallery div").filter("div[data-categories=all]").addClass('active').slideDown();
//$ before variable name is a name convention for variables that are jquery
//targets the nav li
$(".filter-nav").find("li").on("click", function(){
//remove active state from all li in filter-nav
$(".filter-nav li").removeClass('active');
//add class to target li in filter nav
$(this).addClass('active');
//target li data value
var $target = $(this).data("filtertarget");
$(".gallery div").removeClass('active').slideUp().addClass("inactive")
.filter("div[data-categories=" + $target + "]").removeClass("inactive").addClass('active').slideDown();
});
});
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