amirbehzad

<?php

// returns True if the given $var is an Array, and it is not empty;
// otherwise, False.  It does not gives an error if the given $var
// is not an Array, however, it returns False.
function isNonEmptyArray($var) {
    return !empty(@reset($var));
}

amirbehzad

# function to return multiple items (n) from a redis list (q) in an atomic manner
# as seen in: http://redis.io/commands/lpop#comment-431677622
def multi_pop(r, q, n):
  p = r.pipeline()
  p.multi()
  p.lrange(q, 0, n - 1)
  p.ltrim(q, n, -1)
  return p.execute()

amirbehzad

<?php

// ...
protected function getMockedPDO()
{
       $query = $this->getMock('\PDOStatement');
       $query->method('execute')->willReturn(true);

       $db = $this->getMockBuilder('\PDO')
           ->disableOriginalConstructor()

amirbehzad

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

amirbehzad

{
	// Tools -> Build Systems -> New Build Systems
	"cmd" : ["gcc -std=c99 $file_name -o ${file_base_name} && ./${file_base_name} -lm -Wall"],
	"selector" : "source.c",
	"shell": true,
	"working_dir" : "$file_path"
}

amirbehzad

Future-proof Jobs

• Engineer
• Clergy
• HR Manager
• Media Producer
• Game Warden
• Labor Leader
• Artist
• Futurist

amirbehzad

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

echo "gem: --no-document" >> ~/.gemrc
curl -L https://get.rvm.io | bash -s stable --auto-dotfiles --autolibs=enable

rvm install ruby --latest
rvm requirements

brew update

amirbehzad

Merge Sort

First, split the array in half. Then sort both sides.

Infinite Set

A set is said to be infinite if it is not finite

amirbehzad

rules = { 2**x: ['{0:03b}'.format(x).translate(string.maketrans("10","x.")), (x > 0) and (x & 3 == x or x & 3 == 3) * 1] for x in range(8) }

amirbehzad

apt-get install -y libpq-dev python-dev pkg-config libcgraph5 libfreetype6-dev libpng-dev g++ curl libxft-dev graphviz libgraphviz-dev

python2 -m pip install numpy scipy pandas matplotlib pytidylib simplejson requests openpyxl psycopg2 BeautifulSoup networkx ipywidgets pygraphviz

python2 -m pip install seaborn pydot dill nltk rarfile facebook-sdk requests_oauthlib pytidylib requests_futures xlrd sklearn us