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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 For example, in javascript, variables declared with var have function scope. At the level of identifiers (names, rather than variables), this is known as name masking.
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 Hoisting in some languages, a variable can be declared at function scope even within enclosed blocks That is, where the name can be used to refer to the entity.
Variables in javascript can be defined using either the var, [83] let [84] or const [85] keywords
Variables defined without keywords will be defined at the global scope. An immediately invoked function expression (or iife, pronounced iffy, ipa /ˈɪf.i/) is a programming language idiom which produces a lexical scope using function scoping It was popular in javascript [1] as a method of supporting modular programming before the introduction of more standardized solutions such as commonjs and es modules [2] immediately invoked function expressions can be.
Each local variable in a function comes into existence only when the function is called, and disappears when the function is exited Such variables are known as automatic variables These are variables that are external to a function and can be accessed by name by any function. While the term can refer to global variables, it is primarily used in the context of nested and anonymous functions where some variables can be in neither the local nor the global scope.
Global variable in computer programming, a global variable is a variable with global scope, meaning that it is visible (hence accessible) throughout the program, unless shadowed
The set of all global variables is known as the global environment or global state.
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