There is no need to iterate, jQuery will do this for you very conveniently.
It’s not very clear from the question what exactly you want to do, but you can:
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Switch
.plusto.minuswith$(".plus").toggleClass("plus minus") -
Toggle
.plusand.minuson all elements that have either with$(".plus, .minus").toggleClass("plus minus")
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solved How to use Element Selector with Class Selector in Jquery [closed]