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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Call removeLast() to remove the final element from a mutable Groovy list. The method changes the existing list and returns the element it removed. It has been available since Groovy 2.5.0.
Remove the last item with removeLast()
Use removeLast() when you want to change the list itself and capture the element that was at its end:
def list = ['Groovy', 'is', 'great!']
def removed = list.removeLast()
assert removed == 'great!'
assert list == ['Groovy', 'is']The Apache Groovy 4.0.3 List API documents the method as available since Groovy 2.5.0. It describes add() and removeLast() as stack-like operations when the top of the stack is at the list’s end.
Choose based on whether you want to mutate the list
removeLast() is for in-place removal; init() and dropRight(1) are alternatives when you want a derived collection without the last item. The Groovy Development Kit and the official discussion of Groovy and Sequenced Collections (JEP-431) describe these collection behaviors.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problems| Operation | Effect on original | Result | End affected |
|---|---|---|---|
removeLast() |
Mutates the list | Returns the removed element | Last |
init() or dropRight(1) |
Leaves the original unchanged | Returns a collection without the last element | Last |
pop() |
Mutates the list | Returns a removed element | Beginning since Groovy 2.5.0 |
Why older pop() examples can be misleading
In Groovy versions before 2.5.0, pop() and push() operated at the end of a list. Starting with Groovy 2.5.0, they were reimplemented to operate at the beginning. The original Groovy Goodness post by Hubert Klein Ikkink, dated June 13, 2018, notes: “Versions of Groovy before 2.5.0 implemented different methods for the List class for the items at the end of a List object.” For code that must clearly remove the final item, use removeLast() rather than relying on version-sensitive pop() behavior.
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