learn_ruby_ch4_pt3

Question 1

Range from a string include last character

Range from a string exclude last character

Answer 1

cite = “Act V, Scene IV”

cite[0..4] # => “Act V”

cite[0…4] # => “Act “

Question 2

Use regular expression to find “horse!” at end of line

“A horse” at beginning of line index point 0

Answer 2

line = “A horse! a horse! my kingdom for a horse!”

line[/horse!$/] # => “horse!”

line[/^A horse/, 0] # => “A horse”

Question 3

Find the index of “k”

Answer 3

line = “A horse! a horse! my kingdom for a horse!”

line.index(“k”) # => 21

Question 4

Compare two strings in two ways

Answer 4

hay = "liberty"
nicolay = "Liberty"

hay == nicolay # => false

hay.eql? nicolay # => false

Question 5

Use the spaceship operator to determine if a string is equal to, greater than, or less than

Answer 5

“a” <=> “a” # => 0
“a” <=> 97.chr # => 0
“a” <=> “b” # => −1
“a” <=> “`” # => 1

Ignore case
“a” <=> “A” # => 1
“a”.casecmp “A” # => 0