How to do guard let statement in Kotlin like Swift?

Issue

I want to write guard let statement in Kotlin like Swift.

For example:

guard let e = email.text , !e.isEmpty else { return }

Any advice or sample code?

Solution

Try

val e = email.text?.let { it } ?: return

Explanation: This checks if the property email.text is not null. If it is not null, it assigns the value and moves to execute next statement. Else it executes the return statement and breaks from the method.

Edit: As suggested by @dyukha in the comment, you can remove the redundant let.

val e = email.text ?: return

If you want to check any other condition, you can use Kotlin's if expression.

val e = if (email.text.isEmpty()) return else email.text

Or try (as suggested by @Slaw).

val e = email.text.takeIf { it.isNotEmpty() } ?: return

You may also like to try guard function as implemented here: https://github.com/idrougge/KotlinGuard

Answered By - farhanjk