Whereas Java and several other programming languages have a wide and rich range of datatypes and collections types, JavaScript only has a small number of primitive datatypes (Boolean, Number ...

Variables hold a wide variety of information temporarily. The JavaScript data types that can be stored in a variable include: JavaScript variables can hold a few other kinds of data, but these are ...

5.3.1 Reference type Reference values are objects stored in memory and references to ... they can only be re-assigned, and hence all primitive values in JavaScript are immutable.

Primitive values are directly assigned to a variable, and when you manipulate a primitive type, you're working directly on the value. Unlike objects, primitives do not have properties or methods, but ...