Intro to JS: Functions, Scope & Objects

What is the keyword used to define a function in JavaScript?

• define

• function

• method

• procedure

In the context of JavaScript, what does the term "scope" refer to?

• The number of lines in a function

• The accessibility of variables and functions in different parts of the code

• The speed at which a function executes

• The size of the code block

Given the function definition `function add(a, b) { return a + b; }`, what will `add(3, 4)` return?

• 34

• 7

• 12

• undefined

Consider the following code snippet: ```javascript var color = 'blue'; function changeColor() { var color = 'yellow'; console.log(color); } changeColor(); console.log(color); ``` What will be logged to the console?

• yellow, blue

• blue, yellow

• yellow, yellow

• blue, blue

What will be the output of the following code? ```javascript var myDog = { name: 'Buddy', age: 5 }; delete myDog.age; console.log(myDog.age); ```

• 5

• undefined

• null

• Error

Analyze the following code and determine what it does: ```javascript function multiplyByTwo(n) { return n * 2; } var result = multiplyByTwo(4); console.log(result); ```

• It multiplies 4 by 2 and logs 8

• It adds 2 to 4 and logs 6

• It divides 4 by 2 and logs 2

• It logs an error

Given the object `var car = { brand: 'Toyota', model: 'Corolla' };`, how can you check if the property `model` exists in the object?

• car.hasOwnProperty('model')

• 'model' in car

• Both A and B

• Neither A nor B

When defining a function, the definition must occur before it is called.

• true

• false