tsiege

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!






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bshyong

class BSTnode(object):
    """
Representation of a node in a binary search tree.
Has a left child, right child, and key value, and stores its subtree size.
"""
    def __init__(self, parent, t):
        """Create a new leaf with key t."""
        self.key = t
        self.parent = parent
        self.left = None

wbotelhos

# Could not find Firefox binary (os=linux). Make sure Firefox is installed or set the path manually with Selenium::WebDriver::Firefox::Binary.path= (Selenium::WebDriver::Error::WebDriverError)

require 'selenium-webdriver'
Selenium::WebDriver::Firefox::Binary.path='/usr/bin/firefox/firefox-bin'

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

jexchan

Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "[email protected]"

gnomet

CREATE DATABASE sharetribe_test CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE DATABASE sharetribe_development CHARACTER SET utf8 COLLATE utf8_general_ci; 
CREATE DATABASE sharetribe_production CHARACTER SET utf8 COLLATE utf8_general_ci;

GRANT all privileges ON sharetribe_development.* TO 'sharetribe'@'localhost' IDENTIFIED BY 'put_a_password_here';
GRANT all privileges ON sharetribe_production.* TO 'sharetribe'@'localhost' IDENTIFIED BY 'put_a_password_here';
GRANT all privileges ON sharetribe_test.* TO 'sharetribe'@'localhost' IDENTIFIED BY 'put_a_password_here';

ryanflorence

var http = require("http"),
    url = require("url"),
    path = require("path"),
    fs = require("fs")
    port = process.argv[2] || 8888;

http.createServer(function(request, response) {

  var uri = url.parse(request.url).pathname
    , filename = path.join(process.cwd(), uri);

isaacs

echo 'export PATH=$HOME/local/bin:$PATH' >> ~/.bashrc
. ~/.bashrc
mkdir ~/local
mkdir ~/node-latest-install
cd ~/node-latest-install
curl http://nodejs.org/dist/node-latest.tar.gz | tar xz --strip-components=1
./configure --prefix=~/local
make install # ok, fine, this step probably takes more than 30 seconds...
curl https://www.npmjs.org/install.sh | sh

teepark

import bisect
import itertools
import operator


class _BNode(object):
    __slots__ = ["tree", "contents", "children"]

    def __init__(self, tree, contents=None, children=None):
        self.tree = tree

zhengjia

=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')