Ruby Methods

Question 1

puts

Answer 1

kernel method that outputs a statement to the screen as a string

Question 2

to_s

Answer 2

converts to string

Question 3

to_i

Answer 3

converts to integer

Question 4

to_f

Answer 4

converts to float

Question 5

gets

Answer 5

a kernel method to retrieve strings

Question 6

chomp

Answer 6

removes the carriage return from user inputs

Question 7

reverse

Answer 7

reverses a string

Question 8

length

Answer 8

gives the total amount if characters in a string, including spaces. the result is an integer.

also gives the number of objects in an array.

Question 9

upcase

Answer 9

changes all letters to uppercase

Question 10

downcase

Answer 10

changes all letters to lowercase

Question 11

swapcase

Answer 11

switches the cases on letters

Question 12

capitalize

Answer 12

changes the first character in a string to uppercase if it is a letter

Question 13

center

Answer 13

centers a string on a line. argument = total line width to center the string in.

Question 14

ljust

Answer 14

left justifies a string on a line. argument = total line width to center the string in.

Question 15

rjust

Answer 15

right justifies a string on a line. argument = total line width to right justify the string in.

Question 16

**2

Answer 16

squared

Question 17

**.5

Answer 17

square root

Question 18

%

Answer 18

modulus. gives the remainder of a number

Question 19

abs

Answer 19

absolute of a number

Question 20

rand

Answer 20

generates random numbers.
if argument is blank, rand uses 0.0-1.0 floating point
rand generates numbers minus 1 of the argument
argument of 1 = 0

Question 21

srand

Answer 21

the seed for rand.
argument must be a number.
memorizes a sequence for random numbers.

Question 22

what are the comparison methods?

Answer 22

> greater than this
< lesser than this
>= greater or equals to
<= lesser or equals to
== equals to
!= not equal to

Question 23

how does ruby compare strings with comparison methods?

Answer 23

alphabetically by the dictionary (lexicographically)
< comes before:
ie 'cat' < 'dog' = true
> comes after:
ie 'dog' > 'cat' = true

however, capital letters come before lowercase
ie ‘cat’ < ‘Dog’ = false

same goes for numbers
ie 2 < 10: true but,
‘2’ < ‘10’: false

Question 24

each

Answer 24

an array iterator that lets you perform something to each slot of an array

Question 25

times

Answer 25

a number iterator that repeats an action equivalent to the number

Question 26

push

Answer 26

array method that adds an object to the end of an array

Question 27

pop

Answer 27

array method that removes the last object of an array

Question 28

last

Answer 28

an array method that uses the last entry of an array

Question 29

join

Answer 29

array method that joins objects together. The argument used is a delimiter ie comma.