Javascript

Question 1

What is a function in JavaScript?

Answer 1

process for a set of action that can be repeated

Question 2

Describe the parts of a function definition.

Answer 2

function keyword, parenthesis parameter list , curly braces

Question 3

Describe the parts of a function call.

Answer 3

function name, parenthesis

Question 4

When comparing them side-by-side, what are the differences between a function call and a function definition?

Answer 4

presence of code block and a keyword

Question 5

What is the difference between a parameter and an argument?

Answer 5

parameter is an empty box and argument are actual values that fill the parameter

Question 6

Why are function parameters useful?

Answer 6

differents results with different inputs

Question 7

What two effects does a return statement have on the behavior of a function?

Answer 7

give back a value or stop the value

Question 8

Why do we log things to the console?

Answer 8

method for developers to write code to inform the developers what the code is doing.

Question 9

What is a method?

Answer 9

actions that can be performed on objects

Question 10

How is a method different from any other function?

Answer 10

theres a dot

Question 11

How do you remove the last element from an array?

Answer 11

Using the Array pop() Method

Question 12

How do you generate a random number?

Answer 12

function Math. random()

Question 13

How do you delete an element from an array?

Answer 13

Find the index of the array element you want to remove using indexOf , and then remove that index with splice . The splice()

Question 14

How do you append an element to an array?

Answer 14

Use the Array.prototype.push method to append values to the end of an array

Question 15

How do you break a string up into an array?

Answer 15

String.prototype.split()

Question 16

Do string methods change the original string? How would you check if you weren’t sure?

Answer 16

no, i would console.log() to be sure

Question 17

Roughly how many string methods are there according to the MDN Web docs?

Answer 17

45

Question 18

Is the return value of a function or method useful in every situation?

Answer 18

yes Functions return values. Always

Question 19

Roughly how many array methods are there according to the MDN Web docs?

Answer 19

36

Question 20

What three-letter acronym should you always include in your Google search about a JavaScript method or CSS property?

Answer 20

MDN Web Docs

Question 21

Give 6 examples of comparison operators.

Answer 21

== Equal to
!= Not equal to
equal=== Strict equal to
!== Strict not equal to
> Greater than
>= Greater than or equal to
< Less than
<= Less than or equal to

Question 22

What is the purpose of an if statement?

Answer 22

executes a block of code if a specified condition is true.

Question 23

What data type do comparison expressions evaluate to?

Answer 23

boolean

Question 24

How do you compare two different expressions in the same condition?

Answer 24

&&(and). ||(or).