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The memory can be freed only when the returned is no longer accessible.This is not different from storing references in other objects, but is often less obvious because one does not set the references directly and cannot inspect them. a function (A) containing a function (B) containing a function (C).Functions are one of the fundamental building blocks in Java Script.A function is a Java Script procedure—a set of statements that performs a task or calculates a value.Functions must be in scope when they are called, but the function declaration can be hoisted (appear below the call in the code), as in this example: function (defined in Working with objects) is an example of a function that takes an object as an argument. For example, here is a function that computes factorials recursively: var a, b, c, d, e; a = factorial(1); // a gets the value 1 b = factorial(2); // b gets the value 2 c = factorial(3); // c gets the value 6 d = factorial(4); // d gets the value 24 e = factorial(5); // e gets the value 120 There are other ways to call functions.There are often cases where a function needs to be called dynamically, or the number of arguments to a function vary, or in which the context of the function call needs to be set to a specific object determined at runtime.It turns out that functions are, themselves, objects, and these objects in turn have methods (see the method, can be used to achieve this goal.Variables defined inside a function cannot be accessed from anywhere outside the function, because the variable is defined only in the scope of the function.
The functions do not even have to be assigned to a variable, or have a name.
For example, the following loop: , each recursive call itself makes many recursive calls here.
It is possible to convert any recursive algorithm to a non-recursive one, but often the logic is much more complex and doing so requires the use of a stack.
However, the outer function does not have access to the variables and functions defined inside the inner function.
This provides a sort of encapsulation for the variables of the inner function.
However, a function can access all variables and functions defined inside the scope in which it is defined.