Anatomy of a scope function:

1. Accepts a lambda expression and evaluates to it

inline fun <T, R> T.let(block: (T) -> R): R

2. Accepts a block and executes on a receiver inline fun <T, R> with(receiver: T, block: T.() -> R): R

3. Accepts a block of code and evaluates to Context object

inline fun T.apply(block: T.() -> Unit): T

The difference between scope functions is how the object become available inside the block (this or it)

Benefits

Scope functions help us make our code more concise and readable

How to choose what scope function is best for your use case:

Function Object reference Return value is extension function let it Lambda result Yes run this Lambda result Yes run - Lambda result No: called without the context object with this Lambda result No: takes the context object as an argument apply this Context object Yes also it Context object Yes