Menu
Imagine it's Jan 19. This will not be hard if you look at this question today.
Date.today
=> Thu, 19 Jan 2012 # as expected
Date.today + 1
=> Fri, 20 Jan 2012 # as expected
Date.today+1
=> Fri, 20 Jan 2012 # as expected
Date.today +1
=> Thu, 19 Jan 2012 # ?!
What am I missing here?
640
Whitespace might be (mostly) irrelevant to the Ruby interpreter, but its proper use is the key to writing easily readable code.
If you are using Rails, you can simply use: x. blank? This is safe to call when x is nil, and returns true if x is nil or all whitespace.
The difference is that:
Date.today + 1
is an addition of two numerical values and
Date.today +1
is a call to the method today with the parameter sg(day of calendar reform) with value +1
The best way to examine this is to monkey patch the original method with debug output included. See this script as example:
require 'date'
class Date
def self.today(sg=ITALY)
puts "ITALY default("+sg.to_s+")" if sg==ITALY
puts sg unless sg==ITALY
jd = civil_to_jd(*(Time.now.to_a[3..5].reverse << sg))
new0(jd_to_ajd(jd, 0, 0), 0, sg)
end
end
puts "- Addition:"
Date.today + 1
puts "- Parameter:"
Date.today +1
This will print the following console output:
- Addition:
ITALY default(2299161)
- Parameter:
1
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
