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ln017 - Scope Def A definition is anything that establishes...

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Scope Def: A definition is anything that establishes a possible binding to a name. Def: Scope is a programming language tool to limit the visibility of definitions. Example: Early dialects of Basic did not have scoping rules , all definitions of all variables were visible in the global scope . $A = “This is a global string” ... Function Foo () $A = “This is a local string” ... End ... $B = $A What is the content of $B? Problem: When everything is visible everywhere then it is up to the programmer to control visibility of definitions (e.g. globally unique names). Chapter 10
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Scoping with Namespaces Def: A namespace is a zone in a programming language which is populated by names. In a namespace, each name must be unique. The most common namespace in programming languages is the block .
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Scoping with Blocks Def: A block is any language construct that contains definitions and delineates the region of the program where those definitions apply.
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