JavaScript Fundamentals Quiz

JavaScript Key Concepts

• The this keyword in JavaScript refers to the current execution context of the function, allowing it to dynamically change its value based on how the function is called.

Variable Declarations

• var keyword declares a variable that is scoped to the nearest function block, allowing it to be re-declared and updated within its scope, whereas let keyword declares a variable that is block-scoped, meaning it cannot be re-declared within its scope.

Object-Oriented Programming

• The prototype property in JavaScript is used to create a new object that inherits properties and behavior from an existing object, allowing for inheritance and polymorphism.

Data Types

• null represents the intentional absence of any object value, whereas undefined represents an uninitialized or non-existent variable or property.

Function Binding

• The bind method in JavaScript creates a new function that has the same function body as the original function, but with a bound this context, allowing it to be called with a specific context.