I think this might be the easiest and safest way to do what you want in Ruby 1.9.x (sprintf doesn’t support reference by name in 1.8.x): use Kernel.sprintf feature of “reference by name”. Example: >> mystring = “There are %{thing1}s and %{thing2}s here.” => “There are %{thing1}s and %{thing2}s here.” >> vars = {:thing1 => … Read more
Trying to use gets inside a rake task? You may be seeing this error message: Errno::ENOENT: No such file or directory @ rb_sysopen Did you try searching the error, and end up on this page? This answer is not for the OP, but for you. Use STDIN.gets. Problem solved. That’s because just using gets resolves … Read more
Quick Answer If you want to sidestep all this confusion, use the much less confusing block syntax. Here is an example that replaces each backslash with 2 backslashes: “some\\path”.gsub(‘\\’) { ‘\\\\’ } Gruesome Details The problem is that when using sub (and gsub), without a block, ruby interprets special character sequences in the replacement parameter. … Read more
If you include the module the method becomes an instance method but if you extend the module then it becomes a class method. module Const def format puts ‘Done!’ end end class Car include Const end Car.new.format # Done! Car.format # NoMethodError: undefined method format for Car:Class class Bus extend Const end Bus.format # Done! … Read more
Ruby 2.4.0 introduces Comparable#clamp: 523.clamp(0, 100) #=> 100
Ruby doesn’t have constructors, therefore it’s obviously not possible to call them, parent or otherwise. Ruby does have methods, however, and in order to call the parent’s method with the same name as the currently executing method, you can use the super keyword. [Note: super without arguments is a shortcut for passing the same arguments … Read more
For MacOS Catalina, Big Sur, and Monterey: brew install [email protected] bundle config build.libv8 –with-system-v8 bundle config build.therubyracer –with-v8-dir=$(brew –prefix [email protected]) bundle (update version numbers as needed)
The typical way to solve this problem is with a hash that has a default value. Ruby has a nice syntax for passing hash values, if the hash is the last parameter to a method. class Fruit attr_accessor :color, :type def initialize(params = {}) @color = params.fetch(:color, ‘green’) @type = params.fetch(:type, ‘pear’) end def to_s … Read more
I know this is 4 years late but for anybody else that might run across this question you can exclude from Dir the same way you would exclude from Bash wildcards: Dir[“lib/{[!errors/]**/*,*}.rb”] Which will exclude any folder that starts with “errors” you could even omit the / and turn it into a wildcard of sorts … Read more
Much easier and fast due to native C binding: gem install levenshtein-ffi gem install levenshtein require ‘levenshtein’ Levenshtein.normalized_distance string1, string2, threshold http://rubygems.org/gems/levenshtein http://rubydoc.info/gems/levenshtein/0.2.2/frames