schneems

       remote:  !     Could not find bundler (>= 0.a) amongst [actionmailer-3.2.11, actionpack-3.2.11, activemodel-3.2.11, activerecord-3.2.11, activeresource-3.2.11, activesupport-3.2.11, arel-3.0.2, builder-3.0.4, coffee-rails-3.2.2, coffee-script-2.2.0, coffee-script-source-1.4.0, erubis-2.7.0, execjs-1.4.0, hike-1.2.1, i18n-0.6.1, journey-1.0.4, jquery-rails-2.2.0, json-1.7.6, mail-2.4.4, mime-types-1.19, multi_json-1.5.0, pg-0.14.1, polyglot-0.3.3, rack-1.4.4, rack-cache-1.2, rack-ssl-1.3.2, rack-test-0.6.2, rails-3.2.11, railties-3.2.11, rake-10.0.3, rdoc-3.12, sass-3.2.5, sass-rails-3.2.6, sprockets-2.2.2, thor-0.16.0, tilt-1.3.3, treetop-1.4.12, tzinfo-0.3.35, uglifier-1.3.0]        
       remote:  !             

schneems

$ rails new myapp -d=postgresql
$ cd myapp/
$ git add .
$ git commit -m first
$ heroku create
$ git push heroku master
remote: -----> Ruby app detected
remote:
remote:  !
remote:  !     You must use Bundler 2 or greater with this lockfile.

schneems

~ $ rails c
/app/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.3.2/lib/bootsnap/compile_cache/iseq.rb:18: [BUG] Segmentation fault at 0x0000000000001994
ruby 2.6.0dev (2018-11-25 schneems/bundler 65963) [x86_64-linux]

-- Control frame information -----------------------------------------------
c:0030 p:---- s:0171 e:000170 CFUNC  :load_from_binary
c:0029 p:0014 s:0166 e:000165 METHOD /app/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.3.2/lib/bootsnap/compile_cache/iseq.rb:18 [FINISH]
c:0028 p:---- s:0160 e:000159 CFUNC  :fetch
c:0027 p:0069 s:0153 e:000152 METHOD /app/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.3.2/lib/bootsnap/compile_cache/iseq.rb:37 [FINISH]
c:0026 p:---- s:0147 e:000146 CFUNC  :require

schneems

require 'minitest/mock'

class Foo
  def foo
    bar
  end

  def bar

  end

schneems

def early_return(val)
  return val if val

  "nope"
end

def compare_if(val)
  if val
    val
  else

schneems

 10.791165   0.612941  11.447048 ( 12.321773)
 10.392580   0.607349  11.042279 ( 11.851726)
 10.735180   0.595994  11.372614 ( 12.300327)
 10.429255   0.607993  11.079885 ( 11.984101)
 10.636112   0.618988  11.289580 ( 12.239277)
 10.350005   0.593711  10.986309 ( 11.958930)
 10.278313   0.582329  10.912143 ( 12.399119)
 10.326966   0.571871  10.933312 ( 11.845198)
 10.623241   0.612042  11.281695 ( 12.252219)
 10.419475   0.606360  11.061647 ( 12.021191)

schneems

require 'benchmark/ips'
​
MYARRAY = [["a", ["b", nil, "c", ["d"]]]]
​
Benchmark.ips do |x|
  x.report("before") { 
    array = MYARRAY.dup
    array.flatten!
    array.uniq!
    array.compact!

schneems

 13.067572   0.813413  13.924595 ( 15.231642)
 13.340035   0.831787  14.226155 ( 15.775059)
 11.818412   0.738438  12.596999 ( 13.704238)
 10.572116   0.637105  11.253312 ( 12.208787)
 12.093575   0.718124  12.865758 ( 13.949344)
 13.526131   0.871625  14.459032 ( 15.760837)
 10.514290   0.640316  11.197930 ( 12.188919)
 12.140994   0.763224  12.949930 ( 14.065164)
 11.631830   0.716007  12.391399 ( 13.485287)
 10.856942   0.671625  11.574060 ( 12.568493)

schneems

require 'benchmark/ips'

nil_case = nil

Benchmark.ips do |x|
  x.report("nil &. ") { nil_case&.try(:foo) }
  x.report("nil try") { nil_case.try(:foo) }
  x.compare!
end
# Warming up --------------------------------------

schneems

 11.783699   0.650146  12.467872 ( 13.422943)
 12.104542   0.659909  12.797807 ( 13.718245)
 11.925324   0.636579  12.592296 ( 13.490725)
 11.299587   0.630098  11.970901 ( 12.859900)
 11.325793   0.628691  11.995270 ( 13.114663)
 11.342529   0.631052  12.004864 ( 12.916576)
 11.387220   0.634889  12.053792 ( 12.978094)
 11.400185   0.640076  12.078126 ( 13.021475)
 11.412689   0.640065  12.083551 ( 13.011890)
 11.363294   0.634647  12.028172 ( 12.959045)