In lexical scoping (or lexical scope The scope of local variables is determined by using the ' new ' command to declare the variable Also called static scoping or static scope), if a variable name's scope is a certain block, then its scope is the program text of the block definition
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Within that block's text, the variable name exists, and is bound to the variable's value, but outside.
Scope (computer science) in computer programming, the scope of a name binding (an association of a name to an entity, such as a variable) is the part of a program where the name binding is valid
That is, where the name can be used to refer to the entity. Automatic variable in computer programming, an automatic variable is a local variable which is allocated and deallocated automatically when program flow enters and leaves the variable's scope The scope is the lexical context, particularly the function or block in which a variable is defined. Variable shadowing in computer programming, variable shadowing occurs when a variable declared within a certain scope (decision block, method, or inner class) has the same name as a variable declared in an outer scope
At the level of identifiers (names, rather than variables), this is known as name masking. The variable named x is a parameter because it is given a value when the function is called The integer 5 is the argument which gives x its value In most languages, function parameters have local scope
This specific variable named x can only be referred to within the add_two function (though of course other functions can also have variables called x).
Operationally, a closure is a record storing a function [a] together with an environment [1] the environment is a mapping associating each free variable of the function (variables that are used locally, but defined in an enclosing scope) with the value or reference to which the name was bound when the closure was created. At the most basic level name resolution usually attempts to find the binding in the smallest enclosing scope, so that for example local variables supersede global variables Visibility rules, which determine whether identifiers from specific namespaces or scopes are visible from the current context;
