The set of all global variables is known as the global environment or global state. Or in simpler terms, a variable is a named container for a particular set of bits or type of data (like integer, float, string, etc.) or undefined 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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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.
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.
This contains a reference to a global variable 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.
