December 2013
Beginner to intermediate
222 pages
5h 13m
English
Content preview from Grails 2: A Quick-Start Guide
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Groovy Closures
A Groovy closure, in simple terms, is an executable block of code that can be assigned to a variable, passed to a method, and executed.[9] Many of the enhancements Groovy has made to the standard Java libraries involved adding methods that take a closure as a parameter.
A closure is declared by placing code between curly braces. It can be declared as it is being passed to a method call, or it can be assigned to a variable and used later. A closure can take parameters by listing them after the opening curly brace and separating them from the code with a dash-rocket (->), like so:
| | def c = {a, b -> a + b} |
If no parameters are declared in a closure, then one is implicitly provided: it’s called it. Take a look at the following ...
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