Ruby From Other Languages When you first look at some Ruby code, it will likely remind you of other programming languages you’ve used. This is on purpose. Much of the syntax is familiar to users of Perl, Python, and Java (among other languages), so if you’ve used those, learning Ruby will be a piece of cake. This document contains two major sections. The first attempts to be a rapid-fire summary of what you can expect to see when going from language X to Ruby. The second section tackles the major language features and how they might compare to what you’re already familiar with. What to Expect: Language X to Ruby Important Language Features And Some Gotchas Here are some pointers and hints on major Ruby features you’ll see while learning Ruby. Iteration Two Ruby features that are a bit unlike what you may have seen before, and which take some getting used to, are “blocks” and iterators. some_list.each do |this_item| # We're inside the block. # deal with this_item.end Everything has a value Everything is an Object
RVM: Ruby Version Manager - RVM Ruby Version Manager - Documentation AWK-ward Ruby This essay was to be published as a companion piece to The Shell Hater's Handbook, an introductory talk on UNIX shell programming for Ruby hackers given at GoGaRuCo 2010. Alas, the post-conference wrap up magazine will not be published this year and so I'm making the essay available here instead. Ruby, like most successful languages, was assembled from pieces of things that came before it: Smalltalk's consistent object system, Perl's practical syntax, UNIX's sensibilities. There's something less obvious but perhaps more essential that Ruby borrowed: the very concept of blatant, unashamed borrowing. When I started designing Perl, I explicitly set out to deconstruct all the computer languages I knew and recombine or reconstruct them in a different way, because there were many things I liked about other languages, and many things I disliked. Or did it? If these features didn't originate with Perl, as Wall seems to imply, then where did they come from? cat /etc/passwd | awk -F: '{ print $1 }'
Ruby QuickRef Table of Contents Language General Tips These are tips I’ve given over and over and over and over… Use 2 space indent, no tabs. See for more. General Syntax Rules Comments start with a pound/sharp (#) character and go to EOL. Reserved Words alias and BEGIN begin break case class def defined? Types Basic types are numbers, strings, ranges, regexen, symbols, arrays, and hashes. Numbers 1231_234123.451.2e-30xffff 0b01011 0377 ? Strings In all of the %() cases below, you may use any matching characters or any single character for delimiters. %[], %!! 'no interpolation'"#{interpolation}, and backslashes\n"%q(no interpolation)%Q(interpolation and backslashes)%(interpolation and backslashes)`echo command interpretation with interpolation and backslashes`%x(echo command interpretation with interpolation and backslashes) Backslashes: Here Docs: Encodings: Waaaay too much to cover here. Symbols Internalized String. Ranges 1..101...10'a'..' Regexen "r"
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