austra

log:/[1-9][0-9]{4,}ms/

log: END: current_user\[.*\] \([1-9][0-9]{1,}.\d+ seconds\)

austra

With Resque:

queue_name = 'default'
jobs = Resque.data_store.peek_in_queue(queue_name, 0, 500_000); nil;
deleted_count = 0

jobs.each do |job|
  decoded_job = Resque.decode(job)
  if decoded_job['class'] == "My::Class::Name" 
    Resque.data_store.remove_from_queue(queue_name, job)

austra

def aes256_cbc_encrypt(key, data, iv)
  if !(key.bytesize === 32)
    key = Digest::SHA256.digest(key)
  end

  if !(iv.bytesize === 16)
    iv = Digest::MD5.digest(iv)
  end

  #padding = 16 - (data.length % 16)

austra

We tried this about a year or so ago.  We didn't see any memory or performance savings at the time, but I'm not sure about our methodology...  

Eveything I've read about this indicates decent to great memory/peformance gains:  

(Nate Berkopec is big in the Rails perfomance game, and recommends everyone use it.)
https://www.speedshop.co/2017/12/04/malloc-doubles-ruby-memory.html

Other good writeups:
http://engineering.appfolio.com/appfolio-engineering/2018/2/1/benchmarking-rubys-heap-malloc-tcmalloc-jemalloc
https://www.mikeperham.com/2018/04/25/taming-rails-memory-bloat/

austra

Now that I found this...  Lets do the next one.

https://codility.com/programmers/lessons/2-arrays/odd_occurrences_in_array/

a = [9,3,9,3,9,7,9]
a.group_by(&:itself).inject(0){|hash, (k,v)| v.first if v.size.odd?} 
# Could also use transform_values instead of inject on Ruby 2.4

Turns out this one is easy with XOR exlusive or operator ^.

austra

I read about this problem and thought I would try it.  Later I found it is a question here too:
https://codility.com/programmers/lessons/1-iterations/binary_gap/

My first instinct was, "I know regex can do this, but I hate regex" (Which is also a good reason to get better at regex). 
I couldn't quite hoop the syntax so I moved on.  Here is what I came up with:

def max_binary_gap(n)
  max_gap = 0
  arr = n.to_s(2).chars
  while arr.size > 2 do 

austra

# 1) Create your private key (any password will do, we remove it below)

$ cd ~/.ssh
$ openssl genrsa -des3 -out server.orig.key 2048


# 2) Remove the password

$ openssl rsa -in server.orig.key -out server.key

austra

require 'objspace'
require 'benchmark' 

Benchmark.bmbm do |bm|
  bm.report("using [] :") do

    GC.start
    mem_before = ObjectSpace.memsize_of_all
    before = GC.stat[:total_allocated_objects]
    

austra

dis,5,108.59 
nflx,3,130.91

austra

http://www.sm-cloud.com/ruby-json-mapping/
http://jsonapi-rb.org/#rails
https://github.com/trailblazer/representable
https://github.com/trailblazer/roar
https://github.com/remiprev/her
https://github.com/lostisland/faraday_middleware/wiki
http://blog.excelwithcode.com/ruby-api-clients.html