JavaScript Pass by value, Pass by Reference, Scope Hoisting

What is the default parameter passing mechanism in JavaScript?

• Pass by Value

• Pass by Reference

• Pass by Pointer

• Pass by Memory

When passing a primitive type to a function in JavaScript, what is the behavior?

• Pass by Value

• Pass by Reference

• Pass by Address

• Pass by Instance

Which of the following data types is passed by reference in JavaScript?

• String

• Number

• Object

• Boolean

In JavaScript, when an object is passed to a function, what is actually passed?

• Object's reference

• Object's value

• Object's prototype

• Object's address

What is the scope of a variable defined inside a function in JavaScript?

• Global Scope

• Local Scope

• Block Scope

• Function Scope

In JavaScript, what is the scope of a variable declared with the var keyword?

• Global Scope

• Local Scope

• Block Scope

• Function Scope

What is hoisting in JavaScript?

• Lifting weights in the gym

• Moving declarations to the top of the scope

• Declaring a variable with a high priority

• Function Scoped. Running code before it is defined

Which keyword is used to declare a variable in JavaScript with block scope?

• var

• let

• scope

What happens if you try to access a variable before it is declared in JavaScript? Without Using var Keyword.

• No effect, it works fine

• ReferenceError

• SyntaxError

• Undefined

What is the output of the following code snippet?

console.log(a);

var a = 5;

• 5

• undefined

• ReferenceError

• SyntaxError