Ruby Date friday? 函数

Date#friday?() 是Date类的一个方法，用于检查日期是否是星期五。

语法。Date.friday?()

参数。日期值

返回：true – 如果该日期是星期五，否则返回false。

例子 #1 :

# Ruby code for Date.friday?() 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"
  
# friday? form 
puts "Date a friday? form : #{a.friday?}\n\n"
puts "Date b friday? form : #{b.friday?}\n\n"
puts "Date c friday? form : #{c.friday?}\n\n"

输出:

Date a : 2019-01-01

Date b : 2001-04-04

Date c : 2019-01-12



Date a friday? form : false

Date b friday? form : false

Date c friday? form : false

例子 #2 :

# Ruby code for Date.friday?() 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"
  
# friday? form 
puts "Date a friday? form : #{a.friday?}\n\n"
puts "Date b friday? form : #{b.friday?}\n\n"
puts "Date c friday? form : #{c.friday?}\n\n"

输出:

Date a : 2019-01-01

Date b : 2019-12-03

Date c : 2019-02-02



Date a friday? form : false

Date b friday? form : false

Date c friday? form : false