Time.benchmark for simple & fast benchmarks

There is of course Benchmark, but its just not simple enough…

Code

class Time
  def self.benchmark
    t = Time.now.to_f
    yield
    Time.now.to_f - t
  end
end

Usage
Time.benchmark{sleep 0.1}.between?(0.1, 0.2) # true

Ruby: Remove first line from a String

Got a huge string and just want to shift the first line ?

Usage


a = "xxx\nyyy"
first_line = a.remove_first_line!
a == "yyy"
first_line == "xxx"

Code


class String
  def remove_first_line!
    first_newline = (index("\n") || size - 1) + 1
    slice!(0, first_newline).sub("\n",'')
  end
end

Ruby String indexes (indices) — find all indexes in a string

Usage


"aa aaaa    aa".indexes('a') # [0, 1, 3, 4, 5, 6, 11, 12]

Code


class String
  def indexes(needle)
    found = []
    current_index = -1
    while current_index = index(needle, current_index+1)
      found << current_index
    end
    found
  end
end

Fixing corrupt position in acts_as_list

When there is no uniqueness in mysql, things can go wrong….so we fix em…


module ActsAsList
  # positions can get mixed up when users click like crazy -> reorder them if necessary
  # ActsAsList.reorder_positions!(current_user.categories)
  def self.reorder_positions!(objects)
    objects.each_with_index do |object, index|
      new_position = index + 1
      next if object.position == new_position
      object.update_attributes(:position => new_position)
    end
  end
end

sh without rake

Just built this little sh script, that can be used when rake is not installed (we use it to setup a new/clean system)


def sh(cmd)
  puts cmd
  IO.popen(cmd) do |pipe|
    while str = pipe.gets
      puts str
    end
  end
  $?.success?
end

Michael Grosser, the Blog

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Tag Archives: Ruby

Time.benchmark for simple & fast benchmarks

Ruby: Remove first line from a String

Ruby String indexes (indices) — find all indexes in a string

Fixing corrupt position in acts_as_list

sh without rake