JavaScript Basics

JavaScript Basics - Important Points

A. A function that is called when an error occurs.

B. A function that is called when a button is clicked.

C. A function that is passed as an argument to another function and is called when the first function has finished executing.

D. A function that is used to generate random numbers.

A. There is no difference between null and undefined.

B. null is a value that represents an empty object reference, while undefined is a value that represents an uninitialized variable.

C. undefined is a value that represents an empty object reference, while null is a value that represents an uninitialized variable.

D. null and undefined both represent an uninitialized variable.

A. There is no difference between let and const.

B. let is block-scoped, while const is function-scoped.

C. const is block-scoped, while let is function-scoped.

D. const can only be used to declare global variables.

A. To define the arguments for the function.

B. To declare a variable.

C. To exit the function and return a value.

D. To create a loop.

A. There is no difference between a function declaration and a function expression.

B. A function declaration is hoisted to the top of the scope, while a function expression is not hoisted.

C. A function expression is hoisted to the top of the scope, while a function declaration is not hoisted.

D. A function declaration can only be used inside of an object, while a function expression can be used anywhere.