Created
October 10, 2012 02:01
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(Some) differences between ruby versions.
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#!/bin/env ruby | |
# encoding: utf-8 | |
# Differences between Ruby versions | |
code = case ARGV[0] | |
when "1" | |
puts "- Local block variables" | |
<<-CODE | |
i = 10 | |
1.upto(5) do |i| | |
puts i | |
end | |
puts \"i is \#{i}\" | |
CODE | |
when "2" | |
puts "- Hash changes" | |
<<-CODE | |
hash = { 'dog' => 'bark', 'cat' => 'meow', 'bird' => 'tweet' } | |
puts hash.keys.inspect | |
puts hash.to_s | |
CODE | |
when "3" | |
puts "- String changes" | |
<<-CODE | |
puts "STRING"[0] | |
puts "eñe".size | |
CODE | |
when "4" | |
puts "- Syntax changes" | |
[ | |
" | |
my_proc = -> x { puts x + 1 } | |
my_proc.call(10) | |
", | |
" | |
my_proc = proc { |x| puts x + 1 } | |
my_proc.(10) | |
", | |
" | |
hash = { foo: 'bar', baz: 'quux' } | |
puts hash | |
" | |
] | |
when "5" | |
puts "- Method changes" | |
[ | |
" | |
def some_method(required, *optional, config) | |
puts \"Required: \#{required}\" | |
puts \"Optional: \#{optional}\" | |
puts \"Config: \#{config}\" | |
end | |
some_method(1, 2, 3, 4, :option_1 => 'x', :option_2 => 'y') | |
", | |
" | |
def some_method(first = \"first\", second) | |
puts [first, second].inspect | |
end | |
some_method(10) | |
" | |
] | |
end | |
code = [code] if code.is_a?(String) | |
code.each do |c| | |
puts c | |
$stdin.gets | |
begin | |
eval c | |
rescue SyntaxError => e | |
puts e | |
end | |
puts "----------" | |
end |
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