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  4. Groovy Goodness: More Efficient Tail Recursion With TailRecursive Annotation

Groovy Goodness: More Efficient Tail Recursion With TailRecursive Annotation

Hubert Klein Ikkink user avatar by
Hubert Klein Ikkink
·
May. 09, 14 · Interview
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Since Groovy 1.8 we can use the trampoline method for a closure to get better recursive behavior for tail recursion. All closure invocations are then invoked sequentially instead of stacked, so there is no StackOverFlowError. As from Groovy 2.3 we can use this for recursive methods as well with the @TailRecursive AST transformation. If we apply the annotation to our method with tail recursion the method invocations will be sequential and not stacked, like with the closure's trampoline method.

import groovy.transform.TailRecursive

@TailRecursive
long sizeOfList(list, counter = 0) {
    if (list.size() == 0) {
        counter
    } else {
       sizeOfList(list.tail(), counter + 1) 
    }
}

// Without @TailRecursive a StackOverFlowError
// is thrown.
assert sizeOfList(1..10000) == 10000

Code written with Groovy 2.3.

Groovy (programming language) Annotation

Published at DZone with permission of Hubert Klein Ikkink, DZone MVB. See the original article here.

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