Feature request - guard from Swift

[alexeikorshun]

Hi everyone. Can you add guard keyword as in Swift?

It looks good.

[SackCastellon]

What does the guard keyword do, or what functionality adds?

[fatjoe79]

See this topic.

Support Guard Control like swift

sometimes we have define the option type such as “var a: ClassA? = null” ,and then i need check a : val realA = a?:return if(realA.somePr == true){ //do .... } //.... .but i want to use it like swift : **guard** let realA = a else { return } if(realA.somePr == true){ //do .... } //.... how to impl it? as i know swift : guard let unwrappedString = wrappedString ,let bunwrappedString = bwrappedString where .....else { return } // unwrappedString can be accessed outside guard block k…

[cabman]

Why create this topic which the same as another?

Also as I understand from The guard keyword in Swift: early returns made easy Swift needs this because there if construct is not an expression and doesn’t return the value.

All their examples can be implemented as val variable = if (condition) { value } else { return } or if condition is “not null” the shortcut val variable = value ?: { return }

Also all this unwrapping business only applicable to Optional wrapper, which replaced by nullable types in Kotlin. Kotlin smart to know that type of the local variable in not nullable, which is equivalent to unwrapped value in Swift.