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jrunning / rabl-rails-backtrace.txt
Created February 28, 2014 21:08
NoMethodError - undefined method `foo' for "bar":String:
(gem) rabl-rails-0.3.3/lib/rabl-rails/renderers/base.rb:68:in `block in render_resource'
(gem) rabl-rails-0.3.3/lib/rabl-rails/renderers/base.rb:64:in `each'
(gem) rabl-rails-0.3.3/lib/rabl-rails/renderers/base.rb:64:in `inject'
(gem) rabl-rails-0.3.3/lib/rabl-rails/renderers/base.rb:64:in `render_resource'
(gem) rabl-rails-0.3.3/lib/rabl-rails/renderers/base.rb:116:in `block in render_collection'
(gem) rabl-rails-0.3.3/lib/rabl-rails/renderers/base.rb:116:in `each'
(gem) rabl-rails-0.3.3/lib/rabl-rails/renderers/base.rb:116:in `map'
(gem) rabl-rails-0.3.3/lib/rabl-rails/renderers/base.rb:116:in `render_collection'
(gem) rabl-rails-0.3.3/lib/rabl-rails/renderers/base.rb:32:in `block in render'
@jrunning
jrunning / college.rb
Created March 12, 2014 16:45
class College < ActiveRecord::Base
scope :ranked_at_least, ->(rank_low=nil) {
# If no value is given just return self without adding any conditions
if rank.nil? then self
else where("us_news_ranking <= ?", rank_low)
end
}
scope :with_sat_composite {
# Using an array for select() instead of a string means we can can chain
@jrunning
jrunning / coffeescript-indentation-gotcha.md
Created June 30, 2014 15:43
Weird CoffeeScript indentation gotcha

This CoffeeScript...

->
  return if true
  console.log "foo"

...compiles to...

@jrunning
jrunning / server.rb
Created June 30, 2014 18:10
Instant Ruby CGI server
#!/usr/bin/env ruby
require "webrick"
server = WEBrick::HTTPServer.new(Port: 8080, DocumentRoot: Dir::pwd)
trap("INT") { server.shutdown }
server.start
@jrunning
jrunning / ugly_hash.md
Last active August 29, 2015 14:03
http://stackoverflow.com/a/24660655/179125

Cary's version:

def doit(arr, *vals_at)
  arr.each_slice(2)
     .map {|s1,s2|
       [s1.split.last.to_i,[s1.tr(' ','').to_sym, s2.scan(/\d+/).map(&:to_i)]]}
     .to_h
     .values_at(*vals_at)
     .to_h
@jrunning
jrunning / rank_array.rb
Created July 30, 2014 17:46
arr = [89, 52, 52, 36, 18, 18, 18, 7]
def rank_em(arr, accum=[], rank=0, run=0, last_head=nil)
head, *rest = arr
return accum if head.nil?
run += 1
unless head == last_head
rank += run
run = 0
@jrunning
jrunning / gist:488de3a19428b9ebb488
Created July 30, 2014 17:59
Calculating -------------------------------------
falsetru 419 i/100ms
sawa 514 i/100ms
Jordan 1438 i/100ms
Iceman 57 i/100ms
-------------------------------------------------
falsetru 4232.8 (±2.5%) i/s - 21369 in 5.051639s
sawa 5032.0 (±3.5%) i/s - 25186 in 5.011681s
Jordan 15057.5 (±2.7%) i/s - 76214 in 5.065319s
Iceman 575.7 (±1.9%) i/s - 2907 in 5.051481s
@jrunning
jrunning / 01_rank_array_benchmark.rb
Last active August 29, 2015 14:04
Ranking an array of integers in Ruby - http://stackoverflow.com/q/25042260/179125
require "benchmark/ips"
def falsetru(a)
rank = 1
a.group_by {|x| x }
.map { |k,v|
ret = [rank] * v.size
rank += v.size
ret
}.flatten
@jrunning
jrunning / array_process_benchmark.rb
Last active August 29, 2015 14:07 — forked from conorgriffin/array_process_benchmark.rb
require 'set'
require 'benchmark/ips'
def process_old(list)
list.join(" ").split.uniq
end
def process_set(list)
unique = Set.new
list.each {|str| unique.merge(str.split) }
@jrunning
jrunning / fun_with_to_proc.rb
Last active August 29, 2015 14:07
Fun with to_proc
class Regexp
def to_proc
proc {|str| match(str) && $~.to_s }
end
end
arr = [ "foo", "bar 123", "baz", "456", "789 qux" ]
p arr.find(&/bar/) # => "bar 123"