.removeClass(undefined) works not as expected

[[email protected]…]

An empty function call is not the same, as calling a function with an undefined variable. If we check against !arguments.length instead of undefined, we can tell apart these situations.

OLD:
.removeClass() - removes all classes, as expected
.removeClass(undefined) - also removes all classes, which is wrong in my eyes

Fix:
.removeClass(undefined) - removes nothing, like null, false and "" do
Pull Request ​https://github.com/jquery/jquery/pull/913

PS:
I noticed this while calling element.removeClass(someObject.someVar); where the object was defined, but someVar was undefined, so this is a pretty common situation, I think.

[timmywil]

Please add a test supporting this change in the PR.

[matjae]

jsFiddle: ​http://jsfiddle.net/jaggli/npkgS/

[trac-o-bot]

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[Matthias Jäggli]

Fix #12411, .removeClass(undefined) is a chaining no-op. Close gh-913.

.removeClass() removes all classes, as documented .removeClass(window.nonExistentVariable) removes nothing

Changeset: 227c49a4596423a125bdcb1d25a2263e526360db