For Sass 3.3 and later As of Sass 3.3 there is a variable-exists() function. From the changelog: It is now possible to determine the existence of different Sass constructs using these new functions: variable-exists($name) checks if a variable resolves in the current scope. global-variable-exists($name) checks if a global variable of the given name exists. … … Read more
/abc(?!$)/ (?!$) is a negative lookahead. It will look for any match of abc that is not directly followed by a $ (end of line) Tested against abcddee (match) dddeeeabc (no match) adfassdfabcs (match) fabcddee (match) applying it to your case: ruby-1.9.2-p290 :007 > “aslkdjfabcalskdfjaabcaabc”.gsub(/abc(?!$)/, ‘xyz’) => “aslkdjfxyzalskdfjaxyzaabc”
Use the Net::HTTP library. require “net/http” url = URI.parse(“http://www.google.com/”) req = Net::HTTP.new(url.host, url.port) res = req.request_head(url.path) At this point res is a Net::HTTPResponse object containing the result of the request. You can then check the response code: do_something_with_it(url) if res.code == “200” Note: To check for https based url, use_ssl attribute should be true as: … Read more
x = arr.inject(Hash.new(0)) { |h, e| h[e] += 1 ; h }
As Rafe Kettler posted, using zip is the way to go. Hash[members.zip(instruments)]
You can use the block-version of Dir.chdir. Inside the block you are in the requested directory, after the Block you are still in the previous directory: Dir.chdir(‘mydir’){ %x[#{cmd}] }
Note that the convention is: Class#method rather than object#method In code you would have object.method, if object was an instance of class. The # convention is not used in code. From the RDoc documentation: Use :: for describing class methods, # for describing instance methods, and use . for example code.
I have used this because I hated to go to the Date docs to look up the strftime syntax, not finding it there and having to remember it is in the Time docs. require ‘date’ class Date def dayname DAYNAMES[self.wday] end def abbr_dayname ABBR_DAYNAMES[self.wday] end end today = Date.today puts today.dayname puts today.abbr_dayname
Note first that all of this applies to each pair of “short” (e.g. to_s/to_i/to_a/to_h) vs. “long” (e.g. to_str/to_int/to_ary/to_hash) coercion methods in Ruby (for their respective types) as they all have the same semantics. They have different meanings. You should not implement to_str unless your object acts like a string, rather than just being representable by … Read more
# Create a mock object book = MiniTest::Mock.new # Set the mock to expect :title, return “War and Piece” # (note that unless we call book.verify, minitest will # not check that :title was called) book.expect :title, “War and Piece” # Stub Book.new to return the mock object # (only within the scope of the … Read more