Learn how to select child elements using jQuery's $(this) selector. Discover multiple methods including context parameter, find(), and children() with practical examples and performance tips.
Learn how to get the selected radio button value using jQuery with :checked selector and .val() method. Complete guide with examples and best practices for form handling.
Learn how to check if elements exist in jQuery. Discover the .length method, custom plugins, and best practices for element existence checks. Complete guide with code examples.
Complete guide to inserting items into JavaScript arrays at specific indices. Learn splice(), spread operator, and custom insert methods with performance comparisons.