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 Welcome to the wikiproject javascript reference library of magazines, books, websites, and other publications The set of all global variables is known as the global environment or global state.
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In computer science, a local variable is a variable that is given local scope
A local variable reference in the function or block in which it is declared overrides the same variable name in the larger scope
In programming languages with only two levels of visibility, local variables are contrasted with global variables Scope in terms of scope and extent, static variables have extent the entire run of the program, but may have more limited scope A basic distinction is between a static global variable, which has global scope and thus is in context throughout the program, and a static local variable, which has local 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. 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.
