Daenyth

One benefit of using immutable values

When your values are immutable you are often forced to use a declarative style. This means you express what a value is, rather than imperatively building it up.

For example:

results = []
for x in values:
    results.append(func(x))

This common style of imperative code may seem simple at first, but when you read it, you as the reader must mentally construct a state machine and step by step reason about the state of mutation on each line.

dwilkie

Build docker image

$ cd /path/to/Dockerfile
$ sudo docker build .

View running processes

kanaka

Redmonk Jun 2016
    http://redmonk.com/sogrady/2016/07/20/language-rankings-6-16/

Tiobe October 2016
    http://www.tiobe.com/tiobe_index

PYPL Aug 2016
    http://pypl.github.io/PYPL.html

Programming Language Popularity Chart

parsonsmatt

{-
DPLL from the textbook:

function DPLL(clauses, symbols, model ) returns true or false
  if every clause in clauses is true in model then return true
  if some clause in clauses is false in model then return false
  P , value ← FIND-PURE-SYMBOL (symbols, clauses, model )
  if P is non-null then return DPLL(clauses, symbols – P , model ∪ {P =value})
  P, value ← FIND-UNIT-CLAUSE (clauses, model)
  if P is non-null then return DPLL(clauses, symbols – P , model ∪ {P =value})

alskipp

-- data structure for RGBA, RGB & CMYK colors
data Color = RGBA Float Float Float Float
           | RGB  Float Float Float
           | CMYK Float Float Float Float
           deriving (Eq, Ord, Show)

-- list of colors
colors = [ RGBA 0.1 0.1 0.5 0.2
         , RGBA 1 1 0 0.9
         , RGB 0.5 0.5 0

lttlrck

git branch -m old_branch new_branch         # Rename branch locally    
git push origin :old_branch                 # Delete the old branch    
git push --set-upstream origin new_branch   # Push the new branch, set local branch to track the new remote

datagrok

"Vendoring" is a vile anti-pattern

What is "vendoring"?

From a comment on StackOverflow:

Vendoring is the moving of all 3rd party items such as plugins, gems and even rails into the /vendor directory. This is one method for ensuring that all files are deployed to the production server the same as the dev environment.

The activity described above, on its own, is fine. It merely describes the deployment location for various resources in an application.

MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname