Intro

Question 1

What provides ordered, integer-indexed collections of any object?

Answer 1

An Array

Question 2

How should text be formatted in Classes?

Answer 2

CamelCase

Question 3

How should text be formatted in methods, arguments and variables?

Answer 3

in_snake_case

Question 4

How should text be formatted in constants?

Answer 4

IN_SNAKED_UPPERCASE

Question 5

How is a ternary operator structured?

Answer 5

puts Boolean ? “expression if true” : “expression if false”

Question 6

What is a shortcut for creating an array of strings?

Answer 6

array_name = %w{“string”, “string”, “string”}

Question 7

What is a shortcut for creating hashes?

Answer 7

hash_name = {key: ‘value’, key: ‘value’}

Question 8

How would you use the .each block to access data in a hash?

Answer 8

hash_name.each { | key, name | puts “#{name} => #{value}”}

Question 9

What does this produce?
a = %w( ant bee cat dog fish)
a.each { |animal| puts animal}

Answer 9

and
bee
cat
dog
fish

Question 10

What are instance variable names led with?

Answer 10

They are lead with the @symbol

Question 11

The controller passes off heavy code to what?

Answer 11

The model

Question 12

What are the 4 major classes and objects in Ruby

Answer 12

Arrays, Hashes, Objects and Methods

Question 13

What is the operator called?

Answer 13

The spaceship operator

Question 14

Where does Rails look to find the current layout?

Answer 14

Rails first looks for a file in the app/views/layouts with the same base name as the controller

Question 15

What does the following method do:

redirect_to

Answer 15

Tells the browser to send a new request for a different URL

Question 16

What are the five types of variables in Ruby?

Answer 16

Local, Instance, Class, Constants and Global

Question 17

What is the blueprint from which individual objects are created?

Answer 17

A class

Question 18

What does IRb stand for?

Answer 18

Interactive Ruby

Question 19

What is IRb?

Answer 19

A shell for experimentation in which you can immediately view expression results, line by line.

Question 20

What is an identifier?

Answer 20

Identifiers are names of variables, constants, and methods and are case sensitive.

Question 21

What are variables?

Answer 21

They are memory locations which holds any data to be used by any program.

Question 22

What is a Global variable?

Answer 22

A variable that is accessible in every scope

Question 23

What is a Class variable?

Answer 23

A variable defined in a class of which a single copy exists, regardless of how many instances of the class exist

Question 24

What is the scope of a Local variable?

Answer 24

The scope of a local variable ranges from class, module, def, or within a { } or ‘do/end’ block

Question 25

What is an Instance variable?

Answer 25

A variable defined in a class and only affect the object that contains it.

Question 26

What methods pints text to the screen? What are the differences?

Answer 26

Puts & Prints. Puts creates a new line where prints stays on the same line.

Question 27

What is scope?

Answer 27

The determining factor on where variables can be accessed.

Question 28

Which character denotes a global variable?

Answer 28

It is denoted by the $ character.

Question 29

What do reserved words do?

Answer 29

Reserved words that tell the Ruby interpreter what to do.

Question 30

What is domain modeling

Answer 30

The process of figuring out how the real world is represented in an object oriented program.

Question 31

Which character denotes an instance variable?

Answer 31

It is denoted by the @ character.

Question 32

What does a ban method do to a string?

Answer 32

Modifies the receiver in place using the ! character.

Question 33

What string method tells you the number of characters in a string?

Answer 33

.length

Question 34

What method will provide a random number between 0-50

Answer 34

rand(50)

Question 35

What is the name for the position of an item in an array?

Answer 35

An index

Question 36

What does the unshift method do to an array?

Answer 36

Prepends items to the beginning of an array.

Question 37

What is the term for a loop that doesn’t end?

Answer 37

An infinite loop

Question 38

What keyword repeats the current iteration of a loop?

Answer 38

redo

Question 39

What does the ‘break’ keyword do in a loop?

Answer 39

It ends the loop when a condition is met

Question 40

What keyword goes to the next item in a loop?

Answer 40

The ‘next’ keyword

Question 41

What does the ensure block do?

Answer 41

Ensures the code within it gets run regardless of errors.

Question 42

What does the yield keyword do?

Answer 42

Runs the block

Question 43

What symbol tells a Ruby method to expect a block?

Answer 43

The & symbol

Question 44

What will the last statement of a block of code be?

Answer 44

The return value

Question 45

What are prods & lambdas?

Answer 45

Blocks of code assigned to variables. Can be passed to different methods and the scope can change.

Question 46

What are modules?

Answer 46

Modules serve as containers for data, classes, methods, or even other modules. Modules are useful for sharing behavior between classes and frequently used for namespacing classes and constants.

Question 47

What keyword includes a module in a class?

Answer 47

The ‘include’ keyword.

Question 48

What is the difference between include and extend?

Answer 48

Extend operates on the class, include operates on the instance.

Question 49

What symbols are used to access methods and constants inside of a module?

Answer 49

The :: symbols

Question 50

What keyword creates a module?

Answer 50

Module

Question 51

What method must you define to take advantage of the Comparable module?

Answer 51

The rocket ship method

Question 52

How would you create a new date?

Answer 52

Date.new(yyyy, mm, dd)

Question 53

What method must be defined when including the Enumerable module?

Answer 53

the .each method

Question 54

What is refactoring?

Answer 54

Improving the structure or appearance of our code without changing what it actually does.

Question 55

What is the conditional assignment operator?

Answer 55

||=

Question 56

what attribute comes before a method_name?

Answer 56

the ‘def’ attribute

Question 57

What does CRUD stand for

Answer 57

Create, Read, Update, Destroy

Question 58

What does MVC stand for

Answer 58

Model-View-Controller