ruby-v2.2.3 is supposed to have Date class preloaded into irb, however when I enter...
Date NameError: uninitialized constant Date from (irb):1 from /Users/noah/.rubies/ruby-2.2.3/bin/irb:11:in `'
Why should I have to require Date every single time if it's supposed to be preloaded into 2.2.3?
Date isn't listed as a core class in v2.2.3 or the current Ruby v2.3.1 core-classes, but Time is. Here's some IRb output:
$ irb -f
irb(main):001:0> Date.class
NameError: uninitialized constant Date
Did you mean? Data
from (irb):1
from /Users/ttm/.rbenv/versions/2.3.1/bin/irb:11:in `<main>'
irb(main):002:0> Time.class
=> Class
irb(main):003:0> Time.methods(false)
=> [:at, :now, :utc, :gm, :local, :mktime]
That is a limited subset of Time's methods though:
irb(main):002:0> require 'time'
=> true
irb(main):003:0> Time.methods(false)
=> [:at, :now, :utc, :gm, :local, :mktime, :parse, :zone_offset, :strptime, :rfc2822, :rfc822, :httpdate, :xmlschema, :iso8601]
Why do you say Date is preloaded? It's not a core class, it's part of the stdlib so it needs to be required. Time is a core class instead.
You can try to do the following in the beginning of your file:
require 'Date'
As far as I know, (and as Ursus said), Date is not preloaded.
Attention: So Tilec suggested to just load the library at the beginning of the file, which gave me (Not sure if that is true in general): this gave me LoadError: cannot load such file -- Date. Trying gem install Date gives me
ERROR: Could not find a valid gem 'Date' (>= 0) in any repository
ERROR: Possible alternatives: date
Solution: So I'm proposing to correct to lower case:
require 'date'
