![]() ![]() In this case, if the bar() function call results in null, the run statement will be executed afterwards, therefore running both branches of what you thought was a fancied up if-else statement. ![]() As such I would not like to have the existing feature be changed to this. An implicit check at runtime needs to be added. Altering the behavior of default arguments regarding null values would mean that this is not anymore a compile-time feature. The entire someValue?.let expression can produce null values not just when someValue itself was null, but also if the block passed to let returned null. It is all checked and resolved by the compiler. The expression on the right-hand side of the Elvis operator or y in this case. You expect the run block to execute only if someValue = null, but that's actually not the only case when it will run. This basically says to use x if the value is not null, otherwise use y. Println("shouldn't happen if someValue != null") Take the following piece of code: var someValue : String? = null Else if the variable is set from outside the class, use lateinit. It reduces the amount of boilerplate code needed to accomplish a task. The most important difference between Kotlins and Javas type systems is Kotlins explicit support for nullable types. The second consideration is much more important: this conversion you're doing is not equivalent to the original code, you're actually modifying the behavior with this change. If it’s normal for the type to be null during the logic, use nullable. Concise syntax - Kotlin has a concise syntax that makes it easier to read and write code. The first question here is, why? Is this somehow more readable for you than the regular if-else structure? I'd be generally wary of refactoring just for refactoring's sake. Lets see how this feature of Kotlin can help us avoid errors in our code. Kotlin ways of handling null Secure Access Operation val dialog : Dialog Dialog () dialog. In other words, by default, types cannot be null. In Kotlin, nullability is intentionally treated to achieve null safety. That means variables cant have the value null unless you explicitly declare their type to be nullable. Java is weighed down by null and embarrassed by its halfhearted Optional type. I am replacing all the null check with let block in my code The good news is that Kotlin can help us avoid this kind of error because its a null safe language.
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