Completely bad code follows, beware.
Silent error in Ruby 1.8.7:
x = [:a, :b]
=> [:a, :b]
x.slice!(:a)
=> nil
x
=> [:a, :b]Explicit error (resulting in a failing test) in Ruby 1.9.2:
x = [:a, :b]
=> [:a, :b]
x.slice!(:a)
TypeError: can't convert Symbol into IntegerJust yet another incompatibility, but for the better!
You write specs for your javascript, right? If not, you really should.
jasmine-headless-webkit really helps with that. guard-jasmine-headless-webkit makes it all even more enjoyable, although there’s one caveat – it’s not so easy to set it all up.
There is a great guide for that, but it lacks some important details on running guard-jasmine-headless-webkit without graphical interface (X server).
Assuming you already have Xvfb installed, execute this command to run Xvfb in the background:
Xvfb :0 -screen 0 1024x768x24 > /dev/null 2>&1 &And then you need to setup the DISPLAY shell variable in order for guard-jasmine-headless-webkit to automatically connect to our virtual frame buffer. Here’s the excerpt from my .bash_profile (it first checks if there is Xvfb running on display :0 and only then sets the DISPLAY variable):
xdpyinfo -display :0 &>/dev/null && export DISPLAY=:0I needed to output a Hash as a nested HTML structure. Googling didn’t find any satisfactory results, so I decided to roll my own. UL/LI tags seemed like the best choice. It was a nice exercise in recursion.
The result is a function, which outputs a nicely indented HTML. Note, however, that it’s a very basic solution. It doesn’t cope well with anything other than Strings and Numbers (unless your objects support a nice to_s method).
# Prints nested Hash as a nested <ul> and <li> tags
# - keys are wrapped in <strong> tags
# - values are wrapped in <span> tags
def HashToHTML(hash, opts = {})
return if !hash.is_a?(Hash)
indent_level = opts.fetch(:indent_level) { 0 }
out = " " * indent_level + "<ul>\n"
hash.each do |key, value|
out += " " * (indent_level + 2) + "<li><strong>#{key}:</strong>"
if value.is_a?(Hash)
out += "\n" + HashToHTML(value, :indent_level => indent_level + 2) + " " * (indent_level + 2) + "</li>\n"
else
out += " <span>#{value}</span></li>\n"
end
end
out += " " * indent_level + "</ul>\n"
endWho knows, maybe someone somewhere finds it useful.
Update: much more concise solution by Piotr Szotkowski.