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DrqYuto(みなと giruzou

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@giruzou
giruzou / ruby
Created September 29, 2018 04:55
Ruby配列の要素の出現数 ref: https://qiita.com/DrqYuto/items/f815646f6a690b6d5bec
def count(array)
count = Hash.new(0)
array.each do |elem|
count[elem] += 1
end
p count
end
@giruzou
giruzou / ruby
Created September 29, 2018 04:54
Rubyクラス作成 ref: https://qiita.com/DrqYuto/items/4d9ea2fa34c4b048dbcc
class Car
attr_reader :speed
def initialize(speed)
raise ArgumentError, 'speed < 0' if speed < 0
@speed = speed
end
def time(distance)
raise ArgumentError, 'distance < 0' if distance < 0
return nil if @speed.zero?
@giruzou
giruzou / ruby
Created September 29, 2018 04:53
Rubyハッシュ作成 ref: https://qiita.com/DrqYuto/items/2aaf65b26c302dc43539
def create_hash(keys, values)
hash = Hash[keys.zip values]
end
@giruzou
giruzou / ruby
Created September 29, 2018 04:51
Ruby配列のフィルタリング ref: https://qiita.com/DrqYuto/items/b1c40a7a097a14e5413d
def filter(array, item)
array - Array(item)
end
@giruzou
giruzou / ruby
Created September 29, 2018 04:49
Ruby配列の余りの合計 ref: https://qiita.com/DrqYuto/items/4cef67bca6d8569af101
def mod_sum(array, n)
return array.length > 0 ? array.map{ |number| number % n }.inject{ |sum, number| sum + number } : 0
end
@giruzou
giruzou / ruby
Created September 29, 2018 04:48
Ruby配列の中央値 ref: https://qiita.com/DrqYuto/items/7b4168614c5dbf8f1a65
def middle(array)
array.length % 2 == 0 ? array[(array.length / 2) - 1] : array[array.length / 2]
end
@giruzou
giruzou / ruby
Created September 29, 2018 04:25
RUby奇数合計 ref: https://qiita.com/DrqYuto/items/37a31e6b5c3628c376eb
def odd_sum(n)
Array(1..n).select{ |num| num % 2 == 1 }.inject(0,:+)
end
@giruzou
giruzou / ruby
Created September 27, 2018 09:49
Ruby4ます連算 ref: https://qiita.com/DrqYuto/items/120d9af1acba177c1a81
a=gets.to_i;
b=gets.to_i;
puts [a+b,a-b,a*b,a/b].join(" ")
@giruzou
giruzou / ruby
Created September 21, 2018 09:00
Rubyシンボルハロワ ref: https://qiita.com/DrqYuto/items/7dd3ce5c2a78d5423431
puts :Hello.to_s + :World.to_s
@giruzou
giruzou / ruby
Created September 19, 2018 09:51
ruby範囲未満 ref: https://qiita.com/DrqYuto/items/5194da9cfc2fa380b4cc
puts [*1...10]