xeoncross

package main

import (
	"bytes"
	"crypto/ecdsa"
	"crypto/elliptic"
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"crypto/x509/pkix"

xeoncross

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

xeoncross

package main

import (
	"database/sql"
	"database/sql/driver"
	"fmt"
	"strings"
)

type Mapper interface {

xeoncross

const LONG = 26;
const SHORT = 12;
const MID = 9;

function sum(inputs) {
  return inputs.reduce((s, v) => s + v, 0);
}

function average(N, inputs) {
  return sum(inputs.slice(0, N)) / N;

xeoncross

license: MIT
height: 620

xeoncross

http://www.youtube.com/watch?v=-wtIMTCHWuI

http://www.youtube.com/v/-wtIMTCHWuI?version=3&autohide=1

http://youtu.be/-wtIMTCHWuI

http://www.youtube.com/oembed?url=http%3A//www.youtube.com/watch?v%3D-wtIMTCHWuI&format=json

http://www.youtube.com/attribution_link?a=JdfC0C9V6ZI&u=%2Fwatch%3Fv%3DEhxJLojIE_o%26feature%3Dshare

xeoncross

package main

import (
	"crypto/aes"
	"crypto/cipher"
	"crypto/rand"
	"crypto/sha256"
	"encoding/hex"
	"fmt"
	"strings"

xeoncross

/**
 * Returns SHA-256 hash from supplied message.
 *
 * @param   {String} message.
 * @returns {String} hash as hex string.
 *
 * @example
 *   sha256('abc').then(hash => console.log(hash));
 *   const hash = await sha256('abc');
 */

xeoncross

#!/usr/bin/python

# reference => http://www.puffinwarellc.com/index.php/news-and-articles/articles/33.html

from numpy import zeros
from scipy.linalg import svd
from math import log	# needed for TFIDF
from numpy import asarray, sum

titles = ["The Neatest Little Guide to Stock Market Investing",

xeoncross

[
  {
    "url": "http://money.cnn.com",
    "rss": "http://rss.cnn.com/rss/money_topstories.rss"
  },
  {
    "url": "http://thehill.com",
    "rss": "http://thehill.com/rss/syndicator/19110"
  },
  {