Ruby

Question 1

Output a string on its own line

Answer 1

puts

Question 2

Comment out a line

Answer 2

#

Question 3

Operator to find the remainder when two numbers are divided

Answer 3

%

Question 4

Format sequence to convert argument to string

Answer 4

%s

Example: puts “Let’s talk about %s.” % name

Question 5

Format sequence to convert argument as a decimal

Answer 5

%d

example: puts “He’s %d pounds heavy.” % my_weight

Question 6

Output string on the same line

Answer 6

Print

Question 7

Escape sequence to create a new line

Answer 7

/n

Question 8

write a paragraph of text

Answer 8

«s something going on here.
With the PARAGRAPH thing
PARAGRAPH

Question 9

Print variable to the next line after “puts”

Answer 9

,

Example:
puts “Here are the days: “, days

Question 10

Escape sequence to create a tab

Answer 10

\t

Question 11

Escape sequence to make a backslash

Answer 11

\

Question 12

Take user feedback

Answer 12

gets

Question 13

Return a String, removing carriage return characters

Answer 13

.chomp()

Question 14

Load a library

Answer 14

require

Question 15

String interpolation

Answer 15

{}

Question 16

Standard input

Answer 16

STDIN

Question 17

Pass an open file as an argument

Answer 17

File.open(filename)

Question 18

The name of your script

Answer 18

$0

Question 19

Put argument inputs from command line into an array

Answer 19

ARGV

Question 20

Add information to a file

Answer 20

.write(“String”)

Question 21

Read all the data in a file

Answer 21

.read()

Question 22

Truncate the file to a specific number of bytes

Answer 22

.truncate()

Question 23

Create a function

Answer 23

def

Question 24

Define as many arguments as needed

Answer 24

*args

Question 25

Find the starting position of a file

Answer 25

f.seek(0, IO::SEEK_SET)

Question 26

Read a line from a file

Answer 26

f.readline()

Question 27

Equality operator for does not equal

Answer 27

!=

Question 28

Combined comparison operator

Answer 28

Returns 1 if first argument is bigger, 0 if they’re the same and -1 if second argument is bigger.

Question 29

Equality operator for equals

Answer 29

==

Question 30

create a range from 1 - 5

Answer 30

(0..5)

Question 31

Run a for loop over an fruit array

Answer 31

for fruit in fruits
puts fruit
end
[This is called a code block]

Question 32

Have a method return the argument untouched

Answer 32

yield

Question 33

Make a variable readable or writable from outside a class

Answer 33

attr_accessor :variable

Question 34

Make a variable readable from outside a class

Answer 34

attr_reader :variable

Question 35

Make variable writable from outside a class

Answer 35

attr_writer :variable

Question 36

Add a global variable to class

Answer 36

$var

Question 37

Add an instance variable to class

Answer 37

@var

Question 38

Add a class variable

Answer 38

@@var

Question 39

Make class functions accessible from anywhere

Answer 39

public

Question 40

Hide class functions from being accessed

Answer 40

private

Question 41

Scope resolution operator

Answer 41

::

Question 42

Allow a class to use methods from a module

Answer 42

extend

Question 43

Give a method or variable another name

Answer 43

alias :newname :oldname

Question 44

Execute a block of code and return value of last evaluated expression

Answer 44

begin

Question 45

Command to run a block while the program is starting up

Answer 45

BEGIN{}

Question 46

Command to run a block after the program has executed

Answer 46

END{}

Question 47

Test if an expression refers to anything recognizable (literal object, local variable that has been initialized, method name visible from the current scope, etc.).

Answer 47

defined?

Question 48

In a begin/end block, it’s the command to run a last piece of code before the end

Answer 48

ensure

Question 49

Bumps an iterator (while/until/etc) without executing whatever may remain of the block

Answer 49

next

Question 50

unconditional re-execution of a code block, with the same parameter bindings as the current execution.

Answer 50

redo

Question 51

an exception-handling clause

Answer 51

rescue

Question 52

Inside a rescue clause, this command causes Ruby to return to the top of the enclosing code and try executing the code again

Answer 52

retry