Try is also an expression and can have a return value. Kotlin offers try / catch similar to Java. Parse and reciprocal functions are referenced because there are short and many engineers know these concepts. There are small code blocks to highlight the approaches below. The following approaches and related topics looked promising to me: This write up is about approaches how to deal with nulls and exceptions in kotlin. Recently I worked with Kotlin and had to use a Java library that throw exceptions. The possible causes of Null Pointer Exceptions (NPEs) in Koltin include Java interoperation. Kotlin’s type system is aimed to eliminate NullPointerException’s from our code. I have kept the focus on basic manipulations and tried to clear out the confusion while using these two.Kotlin’s type system is aimed at eliminating the danger of null references from code

We can use it on any type of nullable declaration whether it’s String, Array, List, or whatever. So, there is a lot more we can do using these operators. So Elvis Operator gives you the independence to do more in case express is found null during the check. In this case, the value right to ‘ ?: ‘ operator is 0. Instruction right to ‘ ?: ‘ operator will be returned if null is found in nullability check. Safe Operator Call will return ‘ null ‘ by default if the value is null but using Elvis Operator in conjunction with Safe Call Operator you can ask for the desired output other than ‘ null ‘ if the assigned value is null.

And that’s the difference between Safe Operator Call & Elvis Operator.

In the case of Safe Operator Call it would have printed ‘ null ‘. Pic 7 - Result of the above program using Elvis Operator.Īs you have noticed result printed is 0.

Kotlin if not null