jcoglan

benchmark: reduce(), filter(), map(), transducers and for loops

reduce()        10            x 574,156 ops/sec ±1.34% (86 runs sampled)
reduce()       100            x 42,746 ops/sec ±1.99% (88 runs sampled)
reduce()     1,000            x 781 ops/sec ±1.61% (88 runs sampled)

filter() & map()        10    x 128,652 ops/sec ±1.21% (87 runs sampled)
filter() & map()       100    x 9,537 ops/sec ±1.22% (90 runs sampled)
filter() & map()     1,000    x 256 ops/sec ±1.07% (81 runs sampled)
filter() & map()    10,000    x 67.54 ops/sec ±2.56% (68 runs sampled)

jcoglan

def combos(items, k, s = 0, combo = [])
  return [combo] if k == 0

  (s .. items.size - k).flat_map do |i|
    combos(items, k - 1, i + 1, combo + [items[i]])
  end
end

combos([:a, :b, :c, :d, :e, :f], 3).each do |combo|
  p combo

jcoglan

input_path = File.expand_path('../input.txt', __FILE__)
masses     = File.read(input_path).lines.map(&:to_i)

def fuel(mass)
  (mass / 3.0).floor - 2
end

p masses.reduce(0) { |s, m| s + fuel(m) }

def required_fuel(init)

jcoglan

Rust types reference

Prelude

• std::borrow::ToOwned
• std::boxed::Box
• std::clone::Clone
• std::cmp::{PartialEq, PartialOrd, Eq, Ord}
• std::convert::{AsRef, AsMut, Into, From}
• std::default::Default

jcoglan

require_relative "./base"
require_relative "../diff"
require_relative "../rev_list"

module Command
  class Blame < Base

    def run
      @lines   = []
      @commits = []

jcoglan

require "set"

mods = Class.ancestors +
       Method.ancestors +
       UnboundMethod.ancestors

reserved = %i[
  ==
  ===
  =~

jcoglan

o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o---o   o   o---o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o
                                                                                                                                                                                                                                                                                                                |   |       |   |                                                                            
o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o---o---

jcoglan

#!/bin/bash

cd ~/src
dir="git-long-uninteresting-branch"

git init $dir > /dev/null
cd $dir

export GIT_COMMITTER_DATE="1600000000"

jcoglan

.................................................................................................|...............................................................#....#..................
........#........................................................................................|...............................................................#....#..................
........#.............#..........................................................................|...............................................................#....#..................
........#.............#..........................................................................|...............................................................#....#..................
........#.............#..........................................................................|...#....#......................................................#....#..................
........#.............#.......................................................................

jcoglan

module Pack
  module Numbers

    module VarIntLE
      def self.write(size, shift)
        bytes = []
        mask  = 2 ** shift - 1

        until size <= mask
          bytes << (0x80 | size & mask)