jquery get index of element in array code example

Example 1: js in_array

var a = [1, 2, 3];
a.includes(2); // true 
a.includes(4); // false

Example 2: jquery find index of this

$(document).ready(function() {

    $("#example div").click(function() {
        var index = $("#example div").index(this);
        $("#example_index").html("Index " + index + " was clicked");
    });
   
});

Example 3: jquery get element by index

$('ul li').eq(index).css({'background-color':'#343434'});