rubyhardway

Question 1

.rb file

Answer 1

file that contains ruby formatted code

Question 2

-- coding: utf-8 --

Answer 2

Ruby still ignores that as code, but it’s used as a kind of “hack” or workaround for problems with setting and detecting the format of a file.

Question 3

formatter = “%{first} %{second} %{third} %{fourth}”

puts formatter % {first: 1, second: 2, third: 3, fourth: 4}

Answer 3

1 2 3 4

Question 4

\

Answer 4

backslash

Question 5

'

Answer 5

single quote

Question 6

"

Answer 6

double-quote

Question 7

escape characters

Answer 7

escape from the literal meaning of a character in your code

Question 8

\n

Answer 8

new line

Question 9

\b

Answer 9

backspace

Question 10

\t

Answer 10

tab

Question 11

gets vs gets.chomp

Answer 11

gets takes user input with a \n at the end, chomp removes the \n

Question 12

ARGV

Answer 12

argument variable. holds the arguments you pass to your ruby script when you run it.

Question 13

puts “Where do you live #{user_name}? “, prompt ||explain prompt

Answer 13

variable prompt that is set to the prompt we want.

Question 14

read from a file in ruby

Answer 14

txt = open(file_name)

txt. read
txt. close

Question 15

target = open(filename, ‘w’)

what is ‘w’

Answer 15

‘w’ means write-only, truncates existing file to zero length or create a new file for writing.

Question 16

f.seek(0)

Answer 16

seek deals with bytes, so its going to the first byte in the file