"を出力する場合、バックスラッシュ \
mac だと Option ＋ ￥マーク
8 Working With String
puts "Giraffe\" Academy"
# Giraffe" Academy
phrase = "Giraffe Academy"
puts phrase
#Giraffe Academy
puts.upcase()
#GIRAFFE ACADEMY
puts.downcase()
#giraffe academy
phrase = " Giraffe Academy "
puts phrase.strip()
#Giraffe Academy
#スペースとれる
puts.phrase.length()
#15
puts phrase.include? "Academy"
#true
puts phrase.include? "Academys"
#false
puts phrase[0]
#G
puts phrase[3]
#a
puts phrase[0,3]
#Gir
puts phrase.index(G)
#0
puts phrase.index(ffe)
#4
puts "programming".upcase()
#PROGRAMMING