Lesson 3: Introduction to Functions

Question 1

Some Function Concepts:

Answer 1

• Functions are reusable.
• Functions make code easier to debug and maintain.
• Functions need to be called to run its statements.

Question 2

Show how a function can be used to handle events:

Answer 2

onclick=”sayHello();”

Question 3

What is a Method?

Answer 3

Functions that “belong” to a specific object.

Question 4

Write a Return Value:

Answer 4

function hello () {
return 'hello world!';
}
const message = hello();

Question 5

What are Parameters and arguments?

Answer 5

Terms used to represent data provided for the functions as inputs.

Question 6

When a function is invoked, what are the inputs provided called?

Answer 6

Arguments.

Question 7

When are Parameters set?

Answer 7

When the function is defined.

Question 8

Show a function call being used for another function call:

Answer 8

let wall = getArea(3, 5);
alert(wall);

Question 9

What is an Anonymous Function?

Answer 9

A function that doesn’t have a name.

Question 10

Show an example of an Anonymous Function:

Answer 10

const goodbye = function() {
console.log('goodbye world');
};

Question 11

General Functions Syntax:

Answer 11

function sayHello() {
alert("Hello");
}

Question 12

Show a function that calculates the cube of a number and displays the result”

Answer 12

function cube (x) {
alert(x * x * x);
}