The “if” block will execute and print the length of the string if the condition is true. Then, we have an “if” statement in which we have kept the variable “str” not equal to a null value. The “str” contains the string value, which we have printed through the kotlin println function. The variable is assigned a name “str” and sets the String type property to it. In the above code, we have the main function. Let’s have the code implementation below. The “if-else” clause is used in the code to validate a variable’s null safety. To check conditions, we use the “if” keyword. To understand the basics of using the technique to check null values in kotlin, we have the following examples: Example # 1: Using if-else for checking null in Kotlin: Otherwise, Kotlin will notify that the variable has null references, generating a compilation error. However, in the occurrence of nullable variables, we must explicitly handle the null condition. On a non-nullable variable, we can invoke a function or access a property.
As a result, we can’t give a variable a null value because it will trigger a compilation error. Kotlin’s variables are all non-nullable by default. The goal of Kotlin is to eliminate the possibility of a NullPointerException. In the article, we will discuss the preferred and sophisticated technique to effectively manage null safety in Kotlin to use a few specialized operators. A NullPointerException is thrown by the Kotlin compiler if it finds a null reference before executing any additional statements. null means here that there exists no dueDate for this todo.If you have ever written code in Java or another language with the concept of null references, you have probably run across a NullPointerException. In this case, dueDate is truely nullable. However, it makes one case impossible, if you have a "true" nullable variable with a non-null default value. But also for nullable variables if the default value is null (the two meanings of null overlap now).
This works well for "non-nullable" variables, as null can now be used to mean something different. It means, "give me the default value, whatever that is". It's different in a subtle way, passing null has a special meaning now.
Return Todo(body : body, completed : completed, dueDate : dueDate)
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