to_○

to_○

x = 50
y = "3"

p x + y.to_i #to int
p x + y.to_f #to floo


scores = {keiichi:400, tomomi:2000}

p scores.to_a #to arry 
p scores.to_h #to hassh 

%記法

puts ("red", "blue")

puts %(hello) #でＯＫ　間に””を使用できる

p ["red", "blue"]

p %W(red, blue)　#でＯＫ

if

score = gets.to_i


if score > 80 then
        puts "great!"
else if score > 60 then
    puts "good"

else
    puts "so so..."

end

case

#case

signal = gets.chomp #最後の改行コードを取り除くchomp

case signal
when "red" 
    puts "stop!"
when "green" 
    puts "go!"
when "yello" 
    puts "caution!"

else
    puts "wrong signal"

end

While

#while

i = 0

while i < 10 do

    puts "#{i}: hello" # #{i}は回数を見やすくする為に使用

    i += 1 #i = i + 1を短縮して書ける

end

Times

#times

10.times do |i| #i += 1と同じ効果
    puts "hello"
end

for

for i in 15..20 do
    p i
end

for color in ["red", "blue"] do
    p color
end

for name, score in {taguchi:200, fkoji:400} do
    puts "#{name}: #{score}"
end

for color in %W(red, bule) do
    p color
end

each

(15..20).each do |i|
    p i
end

["red", "blue"].each do |color|
    p color
end

{taguchi:200, fkoji:400}.each do |name, score|
    puts "#{name}: #{score}"
end

%W(red, bule).each do |color|
    p color
end