The set of all global variables is known as the global environment or global state. Operationally, a closure is a record storing a function [a] together with an environment 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.
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The syntax of javascript is the set of rules that define a correctly structured javascript program
The examples below make use of the console.log() function present in most browsers for standard text output.
An external variable can be accessed by all the functions in all the modules of a program It is a global variable For a function to be able to use the variable, a declaration or the definition of the external variable must lie before the function definition in the source code Or there must be a declaration of the variable, with the keyword extern, inside the function
A global variable is a variable declared in the main body of the source code, outside all functions, while a local variable is one declared within the body of a function or a block. Furthermore, the variables can also be constants if the value is defined statically Immediately invoked function expressions can be used to avoid variable hoisting from within blocks, protecting against polluting the global environment and simultaneously allowing public access to methods while retaining privacy for variables defined within the function.
