Without variables, programming languages are next to useless. Fortunately, JavaScript’s variable system is incredibly powerful and versatile.

Most programming languages support global variables, but they tend to do it in different ways. For example, PHP uses the global keyword to access a variable declared outside any function: ...

As a programming language, it contains control-flow primitives and string-valued variables. As a command language, it provides a user interface to the process-related facilities of the UNIX operating ...

Mathematical programming discriminant analysis models must be normalised to prevent the generation of discriminant functions in which the variable coefficients and the constant term are zero. This ...