This is the best approach when we are using the var variable. One of Kotlins key features is null-safety, which cleanly deals with null values at compile time rather than bumping into the famous NullPointerException. The following example demonstrates how this operator works. Note that there's no point in optimizing your code when comparing to null explicitly: a null will be automatically translated to a null. This eliminates the need for additional interfaces like Optional and their associated methods. It can only be used when we are sure that we are refereeing to a non-NULL able value. If a is not null, it calls the equals (Any) function, otherwise ( a is null) it checks that b is referentially equal to null. Kotlin’s type system distinguishes between nullable and non-nullable types, enabling built-in null safety checks and providing concise syntax for handling nullable values. This was a big mistake when languages like C. Solved-How to Check Double value is Null or Zero in kotlin-kotlin When ratio is null, the predicate it 0.0 evaluates to false. Null Safety In Java, all objects were allowed to be nullable. ![]() ![]() This is represented by When the asserted variable holds a null value, Null Pointer. ![]() Spring Boot with Kotlin fails with “Parameter specified as non-null is null” when you specify default parameters for method arguments and these arguments are passed from class constructor and constructor arguments are private. You can use the '.let' operator in Kotlin to check if the value of a variable is NULL. I consider Kotlin to be a very superior language, and it is also my favourite. This operator converts the type of a boxed variable to not-null type.
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