primitive – Page 5 – Tarik Billa

Why don’t Java Generics support primitive types?

October 2, 2022 by Tarik

Generics in Java are an entirely compile-time construct – the compiler turns all generic uses into casts to the right type. This is to maintain backwards compatibility with previous JVM runtimes. This: List<ClassA> list = new ArrayList<ClassA>(); list.add(new ClassA()); ClassA a = list.get(0); gets turned into (roughly): List list = new ArrayList(); list.add(new ClassA()); ClassA … Read more

Why is typeof null “object”?

September 27, 2022 by Tarik

From the MDN page about the behaviour of the typeof operator: null // This stands since the beginning of JavaScript typeof null === ‘object’; In the first implementation of JavaScript, JavaScript values were represented as a type tag and a value. The type tag for objects was 0. null was represented as the NULL pointer … Read more