Kotlin Programming: The Big Nerd Ranch Guide, 2nd Edition

Using Scope Functions

Table 12.1 summarizes the Kotlin scope functions discussed in this chapter:

Table 12.1  Scope functions

Function	Passes receiver to lambda as argument?	Provides relative scoping?	Returns
let	Yes	No	Lambda result
apply	No	Yes	Receiver
run a	No	Yes	Lambda result
with b	No	Yes	Lambda result
also	Yes	No	Receiver
takeIf	Yes	No	Nullable version of receiver
takeUnless	Yes	No	Nullable version of receiver
a The non-receiver version of run (less commonly used) passes no receiver, performs no relative scoping, and returns the lambda result. b with is not called on the receiver like this: "hello.with {..}". Instead, it treats the first argument as the receiver, ...