Ruby 2.1.0 Language Changes
Frozen string literals
> string = "hi mom"f
= "hi mom"
> string.frozen?
= true
> string << "lol"
RuntimeError: can't modify frozen String
from (irb):27
from /Users/Justin/.rubies/ruby-2.1.0-preview1/bin/irb:11:in `<main>'
Rational literals
> 3.14r
= (157/50)
> 0.01r
= (1/100)
Very useful when the (im)precision of Float will not do:
> 1.1234567890123456789
= 1.1234567890123457
> 1.1234567890123456789r
= (11234567890123456789/10000000000000000000)
def now returns the method name as a symbol
> def foo() bar end
= :foo
See more in the NEWS file.