This will iterate through all the elements: array = [1, 2, 3, 4, 5, 6] array.each { |x| puts x } # Output: 1 2 3 4 5 6 This will iterate through all the elements giving you the value and the index: array = [“A”, “B”, “C”] array.each_with_index {|val, index| puts “#{val} => #{index}” … Read more
You can do that in several ways: As you shown with << but that is not the usual way With string interpolation source = “#{ROOT_DIR}/#{project}/App.config” with + source = “#{ROOT_DIR}/” + project + “/App.config” The second method seems to be more efficient in term of memory/speed from what I’ve seen (not measured though). All three … Read more
system The system method calls a system program. You have to provide the command as a string argument to this method. For example: >> system(“date”) Wed Sep 4 22:03:44 CEST 2013 => true The invoked program will use the current STDIN, STDOUT and STDERR objects of your Ruby program. In fact, the actual return value … Read more
# remove all old versions of the gem gem cleanup rjb # choose which ones you want to remove gem uninstall rjb # remove version 1.1.9 only gem uninstall rjb –version 1.1.9 # remove all versions less than 1.3.4 gem uninstall rjb –version ‘<1.3.4’
This looks like JavaScript Object Notation (JSON). You can parse JSON that resides in some variable, e.g. json_string, like so: require ‘json’ JSON.parse(json_string) If you’re using an older Ruby, you may need to install the json gem. There are also other implementations of JSON for Ruby that may fit some use-cases better: YAJL C Bindings … Read more
You could use compact: [1, nil, 3, nil, nil].compact => [1, 3] I’d like to remind people that if you’re getting an array containing nils as the output of a map block, and that block tries to conditionally return values, then you’ve got code smell and need to rethink your logic. For instance, if you’re … Read more
You also have the shortcut option of Dir[“/path/to/search/*”] and if you want to find all Ruby files in any folder or sub-folder: Dir[“/path/to/search/**/*.rb”]
a ||= b is a conditional assignment operator. It means: if a is undefined or falsey, then evaluate b and set a to the result. Otherwise (if a is defined and evaluates to truthy), then b is not evaluated, and no assignment takes place. For example: a ||= nil # => nil a ||= 0 … Read more
Sorry, brief moment of synapse failure. Here’s the real answer. require ‘date’ Time.at(seconds_since_epoch_integer).to_datetime Brief example (this takes into account the current system timezone): $ date +%s 1318996912 $ irb ruby-1.9.2-p180 :001 > require ‘date’ => true ruby-1.9.2-p180 :002 > Time.at(1318996912).to_datetime => #<DateTime: 2011-10-18T23:01:52-05:00 (13261609807/5400,-5/24,2299161)> Further update (for UTC): ruby-1.9.2-p180 :003 > Time.at(1318996912).utc.to_datetime => #<DateTime: 2011-10-19T04:01:52+00:00 … Read more
If you need the task to behave as a method, how about using an actual method? task :build => [:some_other_tasks] do build end task :build_all do [:debug, :release].each { |t| build t } end def build(type = :debug) # … end If you’d rather stick to rake‘s idioms, here are your possibilities, compiled from past … Read more