Ruby Date downto()函数

Date#downto()是一个Date类方法，相当于step(min, -1){|date| …}并返回枚举器。

语法。Date.downto()

参数。日期值

返回：相当于step(min, -1){|date| …}并返回枚举器。

例子 #1 :

# Ruby code for Date.downto() method
  
# loading date
require 'date'
  
# declaring Date 
a = Date.new(2019, 1, 1)
  
# declaring Date
b = Date.jd(2452004)
  
# declaring Date
c = Date.ordinal(2019, 12)
  
# Date 
puts "Date a : #{a}\n\n"
puts "Date b : #{b}\n\n"
puts "Date c : #{c}\n\n\n\n"
  
  
# downto form 
puts "Date a downto form : #{a.downto(23)}\n\n"
puts "Date b downto form : #{b.downto(21)}\n\n"
puts "Date c downto form : #{c.downto(5)}\n\n"

输出:

Date a : 2019-01-01

Date b : 2001-04-04

Date c : 2019-01-12



Date a downto form : #

Date b downto form : #

Date c downto form : #

例子 #2 :

# Ruby code for Date.downto() method
  
# loading date
require 'date'
  
# declaring Date 
a = Date.parse('2019-01-01')
  
# declaring Date
b = Date.strptime('03-12-2019', '%d-%m-%Y')
  
# declaring Date
c = Date.commercial(2019, 5, 6)
  
# Date 
puts "Date a : #{a}\n\n"
puts "Date b : #{b}\n\n"
puts "Date c : #{c}\n\n\n\n"
  
  
# downto form 
puts "Date a downto form : #{a.downto(23)}\n\n"
puts "Date b downto form : #{b.downto(21)}\n\n"
puts "Date c downto form : #{c.downto(5)}\n\n"

输出:

Date a : 2019-01-01

Date b : 2019-12-03

Date c : 2019-02-02



Date a downto form : #

Date b downto form : #

Date c downto form : #