Ruby Cheatsheet

Sep 27, 2007 | Publisher: ubuntU | Category: Other |  

2006 mb@cenophobie.com available free from www.cenophobie.com/ruby Predefined Variables $! Exception information $@ Array of backtrace $& String of last match $` String left of last match $' Str right of last match $+ Last group of last match $N Nth group of last match $~ Info about last match $= Case insensitive flag $/ Input record separator $\ Output record separator $, Output field separator $. Line number of last file $> Default output $_ Last input line of string $* Command line args $0 Name of script $$ Process number $" Module names loaded $stderr Standard error output $stdin Standard input $stdout Standard output Reserved Words alias and BEGIN begin break case class def defined? do else elsif END end ensure false for if in module next nil not or redo rescue retry return self super then true undef unless until when while yield Types 12345 123.45 1.23e-4 0xFF00 0b01100 1..5 1...5 a'..'z' a'...'z' string sq' string dq" #{expr}" \t\r\n" %q(string sq) %Q(string dq) %(string dq) 'v'} Expressions if expr [then] elsif expr [then] else end unless expr [then] else end expr if expr expr unless expr case expr when comp else end while expr [do] end until expr [do] end do while expr do until expr for var in expr [do] end expr.each [do] end break next redo retry Module/Class module Name end class Name end class Name < Sup end class & | ^ > >= < var else ensure end StandardError ZeroDivisi- onError RangeError SecurityError IOError IndexError RuntimeError Ruby arguments -c Check -d Debug -e One Line -h Help -n gets loop -rL require L -v verbose -w warnings -y comp debug 2006 mb@cenophobie.com available free from www.cenophobie.com/ruby String Str#[num, num/range/regx] -> str Str#capitalize! -> string Str#center (int [,str]) -> str Str#chomp! ([str]) -> str Str#count -> integer Str#delete! ([string]) -> string Str#downcase! -> string Str#each ([str]) do |str| ... end Str#each_line do |line| ... end Str#gsub! (rgx) do |match| ... end Str#include? (str) -> true / false Str#index (str/reg [,off]) -> int Str#insert (int, string) -> string Str#length -> integer Str#ljust (int [,padstr]) -> str Str#rindex (str/reg [,off]) -> int Str#rjust (int [,padstr]) -> str Str#scan (rgx) do |match| ... end Str#split (string) -> array Str#strip! -> string Str#sub! (rgx) do |match| ... end Str#swapcase! -> string Str#to_sym -> symbol Str#tr! (string, string) -> string Str#upcase! -> string File File#new (path, modestring)-> file File#new (path, modestring) do |file| ... end File#open (path, modestring) do |file| ... end File#exist? (path) -> t or f File#basename (path [,suffix]) -> string File#delete (path, ...) File#rename (old, new) File#size (path) -> integer r Read-only, from beginning r+ Read-write, from beginning w Write-only, trunc. / new w+ Read-write, trunc. / new a Write-only, from end / new a+ Read-write, from end / new b Binary (Windows only) Array Array::new (int [,obj]) -> array Array#clear Array#map! do |x| ... end Array#delete (value) -> obj or nil Array#delete_at (index)-> obj or n Array#delete_if do |x| ... end Array#each do |x| ... end Array#flatten! -> array Array#include? (value) -> t or f Array#insert (idx, obj...)-> array Array#join ([string]) -> string Array#length -> integer Array#pop -> obj or nil Array#push (obj...) -> array Object Obj#class -> class Obj#freeze -> object Obj#frozen? -> true or false Obj#inspect -> string Obj#is_a? (class) -> true or false Obj#methods -> array Obj#respond_to? (sym) -> true or false Obj#to_s -> string Dir Dir[string] -> array Dir::chdir ([string]) Dir::delete (string) Dir::entries (string) -> array Dir::foreach (string) do |file| ... end Dir::getwd -> string Dir::mkdir (string) Dir::new (string) Dir::open (string) do |dir| .. end Dir#close Dir#pos -> integer Dir#read -> string or nil Dir#rewind Hash Hash#clear Hash#delete (key) -> obj or nil Hash#delete_if do |k, v| ... end Hash#each do |k, v| ... end Hash#has_key? (k) -> true or false Hash#has_value? (v) -> t or f Hash#index (value) -> key Hash#keys -> array Hash#length -> integer Hash#select do |k, v| ... end -> array Hash#values -> array Test::Unit assert (boolean [,msg]) assert_block (message) do ... end assert_equal (expected, actual [,msg]) assert_in_delta (exp, act, dlt [,message]) assert_kind_of (klass, object [,msg]) assert_match (pattern, string [,msg]) assert_nil (object [,msg]) assert_no_match (pattern, string [,msg]) assert_not_equal (expected, actual [,msg]) assert_not_nil (object [,msg]) assert_not_same (expected, actual [,msg]) assert_respond_to(obj, method [,msg]) assert_same (expected, actual [,msg]) DateTime DateTime::now DateTime::parse (str) DateTime::strptime (str, format) DateTime#day DateTime#hour DateTime#leap? DateTime#min DateTime#month DateTime#sec DateTime#wday DateTime#year Kernel block_given? eval (str [,binding]) raise (exception [,string]) fork do ... end => fixnum or nil proc do ... end => proc print (obj) warn (msg) Ruby: www.ruby-lang.org Doc: www.ruby-doc.org

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