Hi All, i'm still learning Kotlin and i'm currently learning how to use scope functions and would li...

# getting-started

[Alex]

Hi All, i'm still learning Kotlin and i'm currently learning how to use scope functions and would like to understand what the following mean for points 1 and 2

inline fun <T, R> T.let(*block*: (T) -> R): R
1) <T, R> T what does the extra T outside the <> mean
2) What does R mean

[Kirill Grouchnikov]

https://kotlinlang.org/docs/generics.html#generic-functions

[Joffrey]

There are many concepts packed in the same function here, so it's normal to be a bit confused.

<T,R> and the following T are 2 separate parts of the function definition.
• The part between <> declares the type parameters of the function (because the function is generic).
• The following T is the receiver of the function, because let is an _extension_ function.
• The R is a generic type used as the return type of the function and also as the return type of the block argument (which is also a function)

[Alex]

Thank you so much @Joffrey and @Kirill Grouchnikov 😄👍💯