rjspotter

[Ruby] On Find the Intersection of Arrays with a Hash

2008-08-06T22:01:54-07:00

I'm basicly golfing at this point but it was a fun exersize

pools = {1 => [1,2,3], 2=> [3,4,5], 3=> [5,6,7]}

pools.inject([]) {|m,x| m << x[1].select {|y| pools[x[0] + 1].include?(y) unless pools[x[0] + 1].nil?}}.flatten

#or

pools.inject([]) {|m,x| m << (x[1] & pools[x[0] + 1] unless pools[x[0] + 1].nil?)}.compact.flatten

[Ruby] On Array#split_with(something)

2008-08-06T19:54:26-07:00

Yeah like that. *head-desk*

[Ruby] On link_to with an image_tag and text

2008-08-06T19:45:28-07:00

alternate suggestion

<style type="text/css">
  a.go_back { background: url(/images/go_back.png) center left no-repeat; padding-left: /*width of go_back.png*/;}
</style>

<%= link_to 'Go Back', user_path(@user), :class => 'go_back' %>

[Ruby] On link_to with an image_tag and text

2008-08-06T19:31:20-07:00

<%= link_to "#{image_tag("go_back.png")}Go Back", user_path(@user) %>

[Ruby] Array#split_with(something)

2008-08-06T19:07:41-07:00

This started out as "wouldn't it be cool if I could split an array into two arrays based on a regexp match?" The rest may be .... something not very useful.

require 'rubygems'
require 'functor'

class Array

=begin
usage:
  matches, non-matches = arr.split_with exp # where [Regexp, Proc, Array, Integer].include? exp  
=end
  def split_with(exp = nil, &block)
    @_split_with_functor ||= Functor.new do
      given(Regexp, Array) {|exp, arr| arr.select {|x| x =~ exp}}
      given(Proc, Array) {|exp, arr| arr.select {|x| exp.call(x)}}
      given(Array, Array) {|exp, arr| arr.select {|x| exp.include?(x)}}
      given(Integer, Array) {|exp, arr| arr.select {|x| x.to_i < exp}}
    end
    matches = @_split_with_functor.call(exp || block,self)
    [matches, self - matches]
  end

end