https://ruby-china.org/sandect en-us <p><a href="http://www.alphasights.com/careers/apply/hong-kong/ruby-on-rails-developer" rel="nofollow" target="_blank">http://www.alphasights.com/careers/apply/hong-kong/ruby-on-rails-developer</a></p> <p>A local variable named log contains an array of hashes with timestamped events like so log = [ {time: 201201, x: 2}, {time: 201201, y: 7}, {time: 201201, z: 2}, {time: 201202, a: 3}, {time: 201202, b: 4}, {time: 201202, c: 0} ]</p> <p>Please collapse the log by date into an array of hashes containing one entry per day [ {time: 201201, x: 2, y: 7, z: 2}, {time: 201202, a: 3, b: 4, c: 0}, ]</p> <p>Ordering in the input is not defined. Ordering in the result is not important. Do not rely on the names of the hash keys other than :time. The field below executes your code in a Sandbox with $SAFE=4, so you can't define new classes, use global variables, etc.</p> sandect Thu, 20 Mar 2014 20:04:29 +0800 https://ruby-china.org/topics/18050 https://ruby-china.org/topics/18050