[RAILS] notes de syntaxe de base ruby

introduction

Maintenant que j'étudie le rubis sur rails, je vais écrire la syntaxe de base pour que je puisse la comprendre.

Qu'est-ce que le rubis

Qu'est-ce que le rubis?

• Langage d'interprétation (<-> langage du compilateur) --Langage typé dynamique (<-> langage typé statiquement)
• Orienté objet (<->)

Une langue caractérisée par. (Je pense qu'il y en a beaucoup d'autres)

Syntaxe de base

production

count = 10
hello = "Hello"

puts count #42
puts hello #"Hello"

puts "#{hello} #{42}tokyo"  #Hello 42tokyo

Hash et tableau

#Tableau

colors = [red, blue, green, pink, white]

#hacher

#Les trois lignes ci-dessous sont identiques
exam1 = {"subject" => "math", "score" => 100}
exam1 = {:subject=> "math", :score => 100}
exam1 = {subject: "math", score: 100}

exams = [
    {subject: "math", score: 100},
    {subject: "english", score: 40},
    {subject: "japanese", score: 60},
    {subject: "science", score: 90}
]

for, while

for i in [0,1,2,3] do
    puts i
end

index = 0
while index <= 10 do
    puts index
end

each

colors = [red, blue, green, pink, white]

colors.each do |color|
    puts color
end

Méthode (fonction)

def hello
    puts "Hello World"
end

def hello(num, name)
   puts "Hello #{num}#{name}"
end

#hello(42, tokyo) -> Hello 42tokyo

Système de commande de nourriture

require "./menu"

menu1 = Menu.new(name: "sushi", price: 1000)
menu2 = Menu.new(name: "apple", price: 120)
menu3 = Menu.new(name: "banana", price: 100)
menu4 = Menu.new(name: "lemon", price: 80)

menus = [menu1, menu2, menu3, menu4]

puts "=== this is menu ==="
index = 0
menus.each do |menu|
    puts "#{index} : #{menu.info}"
    index += 1
end
puts "===================="

puts "choose menu : "

order = gets.chomp.to_i

selected_menu = menus[order]

puts "selected menu : #{selected_menu.name}"

puts "how many?"

count = gets.chomp.to_i

puts "your check is #{selected_menu.get_total_price(count)}"

class Menu
    attr_accessor :name
    attr_accessor :price
    
    def initialize(name:, price:) #Voici la variable de l'instance
      self.name = name
      self.price = price
    end
    
    def info
      return "#{self.name} #{self.price}Cercle"
    end
    
    def get_total_price(count)
      total_price = self.price * count
      if count >= 3
        total_price -= 100
      end
      return total_price
    end
  end
  

=== this is menu ===
0 :sushi 1000 yens
1 :pomme 120 yens
2 :banane 100 yens
3 :citron 80 yens
====================
choose menu : 
3
selected menu : lemon
how many?
20
your check is 1500