Does swift have standard (scope) functions like in Kotlin?

Question

In Kotlin we have a list of standard (scope) functions (e.g. let, apply, run, etc)

Example of usage below

val str : String? = "123"
str?.let{ print(it) }

This makes the code looks more succinct without need to have if (str != null)

In swift, I code it as below

let str: String? = "123"
if str != nil { print(str!) }

I have to have if str != nil. Is there a let provided by default that I could use (without me writing my own)?

FYI, I'm new to Swift, and check around doesn't seems to find it.

Answer 1

if you like if, extend the functionality of Optional

extension Optional {
    func `let`(do: (Wrapped)->()) {
        guard let v = self else { return }
        `do`(v)
    }
}

var str: String? = "text"
str.let {
    print( $0 ) // prints `text`
}
str = nil

str.let {
    print( $0 ) // not executed if str == nil
}