Scope modifiers: Difference between revisions

First approximation: All variables are either "global" in scope, or are local to the currently executing explicit definition. Local names shadow global names. J provides kinds of assignment -- assignment to a local name (<tt>=.</tt>) and assignment to a global name (<tt>=:</tt>). Shadowed global names ("global" names which have the same name as a name that has a local definition) can not be assigned to (because this is typically a programming mistake and can be easily avoided by performing the assignment in a different execution context). Here's an interactive session: