Groovy Beginner Tutorial 16 | Closures

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Closures
What are closures
How to use closures
Why do we need closures
a block of code that can
- take parameters
- refer variables
- return values
- can be passed as parameter in a method
References
/ practical-uses-for-clo...
www.quora.com/...
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[@ksuhdilla]

great video - thank you so much A lot of thoughts go into these videos and I even like the quizzes you have made

[@RaghavPal]

Most welcome

[@tayal11991]

Very informative...👍

[@RaghavPal]

Thanks for watching Himanshu

[@victorm9487]

Thank u great explanation !

[@RaghavPal]

Most welcome Victor

[@CodeWithSeenu]

This is very informative. So, closures in groovy is like static methods in java?

[@RaghavPal]

Srinivas No, closures in Groovy are not like static methods in Java. A closure in Groovy is an anonymous function that can be passed around as an object. It can access the variables that were in scope when it was created. A static method in Java is a method that is associated with a class, not with an object. It can only access the variables that are declared as static in the class. Here is an example of a closure in Groovy: ``` def myClosure = { println "Hello, world!" } ``` This closure takes no arguments and returns nothing. It prints the string "Hello, world!" to the console. Here is an example of a static method in Java: ``` public static void myStaticMethod() { System.out.println("Hello, world!"); } ``` This method takes no arguments and returns nothing. It prints the string "Hello, world!" to the console. As you can see, the closure and the static method are both anonymous functions. However, the closure can access the variables that were in scope when it was created, while the static method cannot. I hope this helps

[@BabuD4m]

you can call variable inside the function or method. But the variable should be as a global variable. ex: a=100 //global variable def b=200 //local variable because of def def m1() { println(a) // will be 100 here //println(b) // will be error here since calling local variable } m1() this will apply every where in groovy .

[@RaghavPal]

Thanks for adding this

[@ramvijay1648]

Really Helpful, Thanks for the session given on Closures. Can you please make a video on Operator like > in groovy

[@RaghavPal]

Noted Ram

[@rainerhaseneder2480]

Thanks for the video. I haven't got yet though why we need it though. :-) The only notion I got is that closures allow you to nest functions and bring some default features/methods, because anything is an object in Groovy and brings along those default features/methods. My starting point is a code example as Jenkinsfile (a script written in Groovy) where there is one closure inside a function and this closure executes one very long make command in a shell. This is all and the closure is called exactly one time. I see also a comment that this is done to avoid code duplication. Maybe you have another idea ? :-)

[@RaghavPal]

Hi Rainer, I know the concept of closure is a little tricky. I will plan to have a separate session on understanding closures

[@sadabhasan8814]

very good ...Very need full

[@RaghavPal]

Thanks for watching Sadab

[@udaykumark27]

Thanks for your Video it's really useful...

[@RaghavPal]

Glad to hear that Uday

[@saqibahmed3382]

Hello thank u for making groovy script making us understand easily, where is the notes of all these concepts??

[@RaghavPal]

notes available in the description below the video

[@digitalbunny3284]

I"m not quite understands this part myList.find {}? I'm not sure what this is.

[@RaghavPal]

Hi, So it is an inbuilt function and uses a closure. I will suggest to check more examples online

[@vinaysiri6786]

made it simple

[@RaghavPal]

Happy to know that Vinay

[@learntolearn1063]

in the 7:45 you used the each method to print the list using the closures but the example is not true because you did not use the closures to print the items rather than you used the print method . The right example should be like that def list = ["apples","Orange","Grapes"] list.each { element -> print("the element is : ${element} ") }

[@RaghavPal]

Ok, will check this

[@dipi411]

It's very confusing

[@RaghavPal]

Hi Bhabani, let me know what exactly is the issue