vasanthk

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?

ner00

// ==UserScript==
// @name            View Image
// @namespace       https://github.com/bijij/ViewImage
// @version         3.7.0.14
// @description     Re-implements the Google Images' "View Image" and "Search by Image" buttons.
// @author          Joshua B
// @icon            data:image/png;base64,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

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

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!






\

kevin-smets

Requirements

Minikube requires that VT-x/AMD-v virtualization is enabled in BIOS. To check that this is enabled on OSX / macOS run:

sysctl -a | grep machdep.cpu.features | grep VMX

If there's output, you're good!

Prerequisites

ecasilla

##
# Creates an alias called "git hist" that outputs a nicely formatted git log.
# Usage is just like "git log"
# Examples:
#   git hist
#   git hist -5
#   git hist <branch_name>
#   git hist <tag_name> -10
##
git config --global alias.hist "log --pretty=format:'%C(yellow)[%ad]%C(reset) %C(green)[%h]%C(reset) | %C(red)%s %C(bold red){{%an}}%C(reset) %C(blue)%d%C(reset)' --graph --date=short"

jwilson8767

// MIT Licensed
// Author: jwilson8767

/**
 * Waits for an element satisfying selector to exist, then resolves promise with the element.
 * Useful for resolving race conditions.
 *
 * @param selector
 * @returns {Promise}
 */

gruber

The regex patterns in this gist are intended only to match web URLs -- http,
https, and naked domains like "example.com". For a pattern that attempts to
match all URLs, regardless of protocol, see: https://gist.github.com/gruber/249502


# Single-line version:

(?i)\b((?:https?:(?:/{1,3}|[a-z0-9%])|[a-z0-9.\-]+[.](?:com|net|org|edu|gov|mil|aero|asia|biz|cat|coop|info|int|jobs|mobi|museum|name|post|pro|tel|travel|xxx|ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cs|cu|cv|cx|cy|cz|dd|de|dj|dk|dm|do|dz|ec|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|s

malarkey

When times get tough and people get nasty, you’ll need more than a killer smile. You’ll need a killer contract.

Used by 1000s of designers and developers Clarify what’s expected on both sides Helps build great relationships between you and your clients Plain and simple, no legal jargon Customisable to suit your business Used on countless web projects since 2008

…………………………

kyledrake

# The blog post that started it all: https://neocities.org/blog/the-fcc-is-now-rate-limited
#
# Current known FCC address ranges:
# https://news.ycombinator.com/item?id=7716915
#
# Confirm/locate FCC IP ranges with this: http://whois.arin.net/rest/net/NET-165-135-0-0-1/pft
#
# In your nginx.conf:

location / {