A modern programming language that makes developers happier.

kotlinlang

I see a lot of new Kotlin programmers think that `?.let { ... } ?: ...` is exactly equivalent to `if (not null) ... else ...` but that's just not true in a general case.

I think this is a super-important distinction to make and why I avoid this construct. Both "branches" will run if your `let { ... }` lambda's last line is an expression that returns `null`. If you start to alias `?.let-?:` to `if-else` in your mind, you're going to be very surprised the first time this happens to you