Kotlin Delegating Properties Tutorial with Example

In last video we learned about Delegation Pattern, and how Kotlin supports it natively. We learned about Delegation with the help of interfaces.
But the same concept of delegating responsibility to other objects can be applied with properties as well. And in this video we will learn how we can delegate class members using Kotlin Delegation.
0:00 Introduction
0:30 Why Property Delegation?
2:38 Creating Delegate
6:15 Delegating Properties
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[@RCMOULI1]

Kind of confusing syntax but explained well. Programming is getting crazy over the decades.

[@ahmednabil5119]

Finally, I understand delegation. THANKS ALOT.

[@this-is-bioman]

Excellent! I finally get the idea and I love this feature ;-D

[@udaysharma5228]

Amazing explanation. I never thought how easy it is.

[@ss-xn5rw]

you explained this very beautifully

[@alvaroisea2259]

Thanks a lot, such a clear explanation

[@-untilwearrive4701]

Best explanation, thanks a lot

[@VenewebTV]

Excellent example, regards from Caracas, Venezuela

[@shreyashchoudhary7413]

Loved it!

[@kishorramani007]

Hi
Have one doubt
I try to re assign some different value (which is below range of 5) in student's firstName and lastName but it cannot assign again
In output, it shows old value

[@preethivalsalan839]

you have explained very well

[@oparvind]

Thank you Sir

[@28Saransh]

thanks man!

[@emanalsbeiheen5619]

Hi belal... Can you please make just one more video on reflection in kotlin and add it to this list,,,, I need to fully understand Reflection,, you are amazing teacher thank you

[@bharath7730]

is NameDelegate object created for each property or there is only one object for every property. Because if it create objects for each property then it may be inefficient.

[@jasdevsingh6795]

Can't we achieve the same with extension functions ?

[@ravipratapsingh3428]

How I want check varriavble value is even only using a single variable not a class

[@junigates]

confusing with operator fun , by the way great info

[@vidyesh]

Custom implementation of the 'setValue' operator using operator overloading.

[@namrathabharadwaj8945]

Hey Belal. How is this delegation any different than creating a common private method to avoid redundant code? I mean what is the significance of delegation over creating a common method in this case?

[@SimplifiedCoding]

Can you submit your version of the code?

[@shashankrana977]

Viradar you threw Kproperty and operator keyword without explaining, I finding it difficult to follow this way

[@master8994]

I didn't understand the property thing please someone explain

[@praveennp4108]

Hi sir , how to crack technical round android interviews 😢
Suppose if they ask either API calling or something like that?? I am new...

[@ss-xn5rw]

you can say i am fresher and learning these topics or better to learn these topics in this channel.

[@praveennp4108]

@@ss-xn5rw thank you...😊😊

[@arjundixit5913]

Okay I understand delegation, but what would be called as delegate in the above example?

[@deepakbisht4957]

It is delegation in the sense that you are sending validation responsibility to another class that actually validating the first and last name.

[@avishekthapa6655]

cant we just create a function that does the validation and used that validation in setter and getter like this
class Student {
var firstName: String? = null
set(value) {
if (isValid(value))
field = value?.trim()?.toUpperCase()
}
var secondName: String? = null
set(value) {
if (isValid(value))
field = value?.trim()?.toUpperCase()
}
private fun isValid(data: String?) = data != null && data.length > 5
}

[@SimplifiedCoding]

Still the delegation is more concise as you can clearly see.

[@amitrajj]

This can be done easily by using Extension functions.

[@hanamanth_vlogs6565]

Good content

[@gibraanjafar1669]

a