learn_ruby_ch4_pt2

Question 1

Concatenate “Hello,” space, “Matz”, and “!” three ways

Answer 1

“Hello,” “ “ “Matz” “!”

“Hello,” + “ “ + “Matz” + “!”

“Hello,”

Question 2

Concatenate with the method

Answer 2

h = “Hello, “
m = “Matz!”
h.concat(m)

Question 3

Make a string immutable

Answer 3

greet = “Hello, Matz!”
greet.freeze

greet. concat(“!”) # => TypeError: can’t modify frozen string
greet. frozen? # => true

Question 4

Check if a string contains a string

Answer 4

speaker = “King Richard III”

speaker[‘King’] # => “King”

speaker[‘yada’] # => nil

Question 5

Use indexing on a line

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

Answer 5

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

line[7] # => “!”

line[18, 23] # => “my kingdom for a horse!”

line[18, 23].capitalize # => “My kingdom for a horse!”