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The moose likes Groovy and the fly likes Groovy - Basic Question Big Moose Saloon
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Groovy - Basic Question

Sri Yasasvi

Joined: Nov 07, 2008
Posts: 28
Hi All,

I am new to Groovy. I am running some basic examples while learning.

Could anyone of you tell me why the last print statement is printing true.

def noParam = { -> println "I'm executed"; return "no param"}
def oneParam = { out -> println "Executed with a ${out.class} parameter"; out << "one param"}
println noParam != "no param // Printing true


Sri Yasasvi

Joined: Nov 07, 2008
Posts: 28
Here is my undrestanding.

noParam is Closure. So the statement (println noParam != "no param") is returning true.

Then i changed the statement (println noParam.toString() != "no param") . But it is still returning true. Could you please explain this.

Mohamed Sanaulla
Saloon Keeper

Joined: Sep 08, 2007
Posts: 3096

Unlike simple code blocks, closures have to be executed. Try invoking call() on the closure and assign the result to some variable

Mohamed Sanaulla | My Blog
Sri Yasasvi

Joined: Nov 07, 2008
Posts: 28
Thank you so much Mohamed!!!

Now i understand clearly.....
I agree. Here's the link:
subject: Groovy - Basic Question