yea i do get when you assign to a property, or when you need a expression, but other than that im not sold on it, "?.let { }" why not just if != null

it allows you to scope something to a specific code block

well any { } is a block with its own local vars

When you have a variable that is shared across threads,

if (x != null) x.doSmth()

is not safe, as x could've changed to null in the meantime.

let

uses a temporary to guarantee that it is not affected by other threads.

yes ive been just shown that, thank you, so its equivalent to val y = this.x if (y != null) y.doSmth() right?

yes

I knew that, but didnt realize it, thanks a lot

let { }

doesn't replace

if

, just use either one of them when its feasible

yea for vals properties its whatever, for vars its useful, thnx