Why is JavaScript output undefined?

Why is JavaScript output undefined?

A method or statement also returns undefined if the variable that is being evaluated does not have an assigned value. A function returns undefined if a value was not returned .

What is namespace in web development?

Namespace is a context for identifiers, a logical grouping of names used in a program. Within the same context and same scope, an identifier must uniquely identify an entity. Each file or subdirectory has a unique name, but one file may use the same name multiple times. …

Why is namespace used?

A namespace is a declarative region that provides a scope to the identifiers (the names of types, functions, variables, etc) inside it. Namespaces are used to organize code into logical groups and to prevent name collisions that can occur especially when your code base includes multiple libraries.

What is definition of an undefined value in JavaScript?

The undefined property indicates that a variable has not been assigned a value, or not declared at all.

What means namespace?

What is namespace in JavaScript and how to use it?

JavaScript does not provide Namespace by default but this functionality can be replicated. It is a container providing scope for set of identifiers, type names, functions or variables, and methods, etc. to prevent collisions among them. It can be created with ease, so with minor tweaks, a namespace can be created. Syntax of JavaScript Namespace

How to replicate JavaScript namespace functionality?

This JavaScript Namespace functionality can be replicated by creating a global object which contains all functions and variables. In modern web applications, different libraries and components are used, so we should have namespace to avoid code ambiguity. We have two types of namespaces divided as ‘Static Namespace’ and ‘Dynamic Namespace’

What is the difference between static and dynamic namespaces in JavaScript?

We can divide the JavaScript Namespaces into two parts as Static Namespace and Dynamic Namespace. With static namespace, we use namespace label as hard coded while with Dynamic namespace, the namespace is referenced inside the function wrapper instead of hard coded.

What is namespace injection?

This Namespace comes under dynamic namespacing also known as namespace injection. It is represented by a proxy which is referenced directly inside function wrapper. Here, we shall pass namespace as an argument to self-invoking functions.