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JavaScript is best known for web page development but it is also used in a variety of non-browser environments. You can learn JavaScript from the ground up by following this JavaScript Tutorial and JavaScript Examples.

In JavaScript, Functions within another function are called “Nested function.” These nested functions have access to the variables and parameters of the outer (enclosing) function, creating a scope hierarchy. A function can have one or more inner functions. 

Syntax:

// Outer function
function outerFunction() {
    // Nested function
    function nestedFunction() {
        // Function logic here
    }
    // Call the nested function
    nestedFunction();
    // Rest of the outer function logic
}
// Call the outer function
outerFunction();