CODEWITHSUNDEEP
grailsgroovy
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Reputation: 5552

Groovy Closures and Params

In groovy you got closure which I kinda get, (similar to js, and ruby blocks) but I came across this code and I would like some clarification.

def bar = {
 -1
}

..
..
.

getResults foo, bar , params, Foo.class.simpleName

Which get getResults is a method that takes a closure bar as a parameter. What I don't get is that in the method it has this:

public int getResults ( foo, bar , params, classSimpleName) {
    def totalCount = bar(params)
..
..
.

Now bar(params) returns -1 which is the value of it. But I dont get how it works. is params a predefined word?

I am working in Grails and I know that my params passed to to controller, have no bar variable in them, and I dont know how they are related to this.

Upvotes: 0

Views: 211

Answers (1)

RaviH
RaviH

Reputation: 3584

bar is a closure. You are invoking the closure with params parameter. bar closure does not care about any parameters. It always returns -1. That's it.

params is a predefined variable in grails controllers.

Upvotes: 2

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