jQuery addClass method

Question

When I call the jQuery method .addClass() do I need to check if the class already exists or it's already implemented? I mean, if I call the same method twice, like

$(var).addClass('class1');
$(var).addClass('class1');

does it cause any issue or it's fine? Thanks

Answer 1

For check if an element have your class name, you can do:

$(var).hasClass('class1');

Answer 2

No you don't need to. addClass internally checks whether class exists. if not, then adds the class

Reference