arkiver

http://stackoverflow.com/questions/22667401/postgres-json-data-type-rails-query
http://stackoverflow.com/questions/40702813/query-on-postgres-json-array-field-in-rails

#payload: [{"kind"=>"person"}]
Segment.where("payload @> ?", [{kind: "person"}].to_json)

#data: {"interest"=>["music", "movies", "programming"]}
Segment.where("data @> ?",  {"interest": ["music", "movies", "programming"]}.to_json)
Segment.where("data #>> '{interest, 1}' = 'movies' ")
Segment.where("jsonb_array_length(data->'interest') > 1")

arkiver

      debug_str = "params: #{params}, current_employee: #{employee.try(:id)}"
      Appsignal.send_exception(e, debug_text: debug_str)

arkiver

perl -pi -w -e 's/ and/ &&/g;' *.rb

arkiver

# Destructive! Use carefully.

# merged branches
((`git branch --merge master`).strip!.split(' ') - ['master', 'release']).map{ |b| `git branch -D "#{b}"; git push origin :"#{b}"` }


# All local branches
((`git branch`).strip!.split(' ') - ['master', 'release', 'development']).map{ |b| `git branch -D "#{b}"; git push origin :"#{b}"` }

arkiver

# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
# for examples

# If not running interactively, don't do anything
case $- in
    *i*) ;;
      *) return;;
esac

arkiver

irb(main):012:0> Date.today
=> Thu, 09 Jul 2015
irb(main):013:0> Date.tomorrow
=> Sat, 11 Jul 2015
irb(main):014:0> Date.today.tomorrow
=> Fri, 10 Jul 2015

arkiver

// run this in your browser's console

setInterval(function(){window.scrollBy(0, 1), 4000 })

// not well tested

arkiver

(defun no-of-ele (lst)
  "Return the no. of elements in a list"
  (if (endp lst)
      0
      (progn (+ 1 (no-of-ele (rest lst))))
      )
  )

;; CL-USER> (no-of-ele '(1 2 3))
;; 3

arkiver

(defun elek (lst n)
  (if (= n 0)
      (progn
        (car lst))
      (elek (rest lst) (- n 1))
      )
  )

;; CL-USER> (elek '(1 2 3 4) 2)
;; 3

arkiver

(defun last-of-list (l)
  "Returns last element of a list"
  (nth (- (list-length l) 1) l))