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@jboner
jboner / latency.txt
Last active December 6, 2025 05:41
Latency Numbers Every Programmer Should Know
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
@kennydude
kennydude / Java.java
Created July 14, 2012 14:31
Encrypt from Java and decrypt on Node.js
// Encrypt where jo is input, and query is output and ENCRPYTION_KEy is key
byte[] input = jo.toString().getBytes("utf-8");
MessageDigest md = MessageDigest.getInstance("MD5");
byte[] thedigest = md.digest(ENCRYPTION_KEY.getBytes("UTF-8"));
SecretKeySpec skc = new SecretKeySpec(thedigest, "AES/ECB/PKCS5Padding");
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, skc);
byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
@iros
iros / API.md
Created August 22, 2012 14:42
Documenting your REST API

Title

<Additional information about your API call. Try to use verbs that match both request type (fetching vs modifying) and plurality (one vs multiple).>

  • URL

    <The URL Structure (path only, no root url)>

  • Method:

@ryanseddon
ryanseddon / curried.es5.js
Created November 6, 2013 02:46
ES5 vs ES6 function currying
function curried(fn) {
var args = Array.prototype.slice.call(arguments, 1);
return function() {
return fn.apply(this, args.concat(Array.prototype.slice.call(arguments, 0)));
}
}
@kevin-smets
kevin-smets / iterm2-solarized.md
Last active December 6, 2025 09:45
iTerm2 + Oh My Zsh + Solarized color scheme + Source Code Pro Powerline + Font Awesome + [Powerlevel10k] - (macOS)

Default

Default

Powerlevel10k

Powerlevel10k

@christofluethi
christofluethi / gist:646ae60d797a46a706a5
Last active April 30, 2025 20:03
Convert m4a to mp3 on OS X command line using ffmpeg
brew update
brew link yasm
brew link x264
brew link lame
brew link xvid
brew install ffmpeg
ffmpeg wiki:
https://trac.ffmpeg.org/wiki/Encode/MP3
@goonoo
goonoo / promise1.js
Last active August 25, 2016 04:10
ES6 promise best practices
// 함수 호출 타이밍에 조건에 따라 promise 실행 분기
// val1 == true, val3 == true인 경우: method1 -> method2 -> method3true
// val2 == true, val3 == false인 경우: method1 -> method2 -> method3false
// val1 == false, val3 == true인 경우: method2 -> method3true
// val2 == false, val3 == false인 경우: method2 -> method3false
function run(val1, val3) {
const p = Promise.resolve(null);
if (val1 === true)
p = p.then(method1);
p = p.then(method2);
@rondy
rondy / Effective_Engineer.md
Last active December 4, 2025 21:25

FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.

Effective Engineer - Notes

What's an Effective Engineer?

@johngrib
johngrib / contribution.sh
Created December 31, 2018 14:58
Show github contribution graph on terminal
#! /usr/local/bin/bash
MYGITHUB=johngrib
RAW=/tmp/$MYGITHUB-github
TABLE=/tmp/$MYGITHUB-github-table
COLORS=/tmp/$MYGITHUB-github-colors
curl -s https://github.com/$MYGITHUB/ > $RAW
TITLE=`cat /tmp/johngrib-github | pcregrep -M '[0-9,]+ contributions\s*\n\s*in the last year'`