nulltarkastukset
Nulltarkastukset, also known as null checks, are programming practices that verify whether a variable or reference is null before performing operations on it. Checking for null values is essential because attempts to dereference a null pointer or use a null value where an object is expected can result in runtime exceptions, crashes, or unpredictable behavior. In many programming languages—such as Java, C#, Kotlin, and Swift—null-related errors are a common source of bugs and security vulnerabilities, particularly in large codebases.
In object-oriented languages, a nulltarkastus typically involves an if‑statement that examines whether a reference is equal
Best practices for nulltarkastukset include: keeping null checks close to the source of the data; using descriptive
By systematically implementing nulltarkastukset, developers improve code robustness, reduce runtime errors, and enhance maintainability. Careful design