The absolute worst type of global mutable state I've had to deal with personally follows this antipattern: oldEnvironment = getGlobalEnvironment() Swit

The absolute worst type of global mutable state I've had to deal with personally follows this antipattern: oldEnvironment = getGlobalEnvironment() SwitchToGlobalEnvironment("Foo") - Do things that rely on the "foo" globals SwitchToGlobalEnvironment(oldEnvironment) Or, worse, functions like this: // NOTE: DO_STUFF assumes "FOO environment". Set FOO ENVIRONMENT before you call it. def doStuff() { - Do stuff that relies on foo environment } or: // NOTE: depends on the value of global FooBar. Adjust FooBar to make DoStuff2 behave how you want def doStuff2() { ... }