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Max Ogden maxogden

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maxogden /
Last active Jun 12, 2021
JS hoisting by example

JavaScript function hoisting by example

Below are many examples of function hoisting behavior in JavaScript. Ones marked as works successfuly print 'hi!' without errors.

To play around with these examples (recommended) clone them with git and execute them with e.g. node a.js

Notes on hoisting

(I may be using incorrect terms below, please forgive me)

maxogden / bibtex.png
Last active Jun 6, 2021
How to make a scientific looking PDF from markdown (with bibliography)

Disclaimer: This is an unofficial post by a random person from the community. I am not an official representative of io.js. Want to ask a question? open an issue on the node-forward discussions repo

io.js - what you need to know


  • io is a fork of node v0.12 (the next stable version of node.js, currently unreleased)
  • io.js will be totally compatible with node.js
  • the people who created io.js are node core contributors who have different ideas on how to run the project
  • it is not a zero-sum game. many core contributors will help maintain both node.js and io.js
maxogden / difflint
Last active May 30, 2021
Run eslint + prettier on only files that you've staged/commited on the current branch
View difflint
#!/usr/bin/env bash
# chmod +x this and save in your PATH. Assumes `eslint` + `prettier` are in your `devDependencies`
BRANCH=$(git branch | grep \* | cut -d ' ' -f2)
BASE=$(git merge-base master $BRANCH) # change master to whatever your trunk branch is
COMMITED=$(git diff --name-only $BASE $BRANCH)
STAGED=$(git diff --staged --name-only)
FILES=$(printf "$COMMITED\n$STAGED" | sort | uniq)
LINT="npx eslint --ignore-path=.prettierignore $FILES"
PRETTIER="npx prettier --list-different $FILES"
maxogden /
Last active May 28, 2021
list of things that are like tacos
maxogden /
Last active May 19, 2021
generate ES512 and RS256 elliptic curve keypairs for JWT JWK (JSON Web Token JSON Web Key) using openssl
# RS256
# private key
openssl genrsa -out rs256-4096-private.rsa 4096
# public key
openssl rsa -in rs256-4096-private.rsa -pubout > rs256-4096-public.pem
# ES512
# private key
openssl ecparam -genkey -name secp521r1 -noout -out ecdsa-p521-private.pem
# public key
maxogden /
Last active May 12, 2021
Video stabilization using VidStab and FFMPEG (Mac OS X)

Video stabilization using VidStab and FFMPEG

Examples here use the default settings, see the VidStab readme on GitHub for more advanced instructions.

Here's an example video I made

Install ffmpeg with the vidstab plugin from homebrew

brew install ffmpeg --with-libvidstab
maxogden / index.js
Last active May 9, 2021
fast loading of a large dataset into leveldb
View index.js
// data comes from here
// download 1994.csv.bz2 and unpack by running: cat 1994.csv.bz2 | bzip2 -d > 1994.csv
// 1994.csv should be ~5.2 million lines and 500MB
// importing all rows into leveldb took ~50 seconds on my machine
// there are two main techniques at work here:
// 1: never create JS objects, leave the data as binary the entire time (binary-split does this)
// 2: group lines into 16 MB batches, to take advantage of leveldbs batch API (byte-stream does this)
var level = require('level')
maxogden /
Created Feb 19, 2021
Bitcoin Regtest Local Server Instructions
  1. Grab the latest bitcoin-core .tar.gz release and unpack it
  2. Add the bin folder to your path
  3. Start the regtest server bitcoind -regtest
  4. Create a test wallet bitcoin-cli -regtest createwallet test
  5. Get a bcrt address for your wallet bitcoin-cli -regtest getnewaddress
  6. 'Mine' some regtest btc bitcoin-cli generatetoaddress 10 <address-from-previous-command>
  7. Make sure it worked `bitcoin-cli getblockcount
maxogden / links.json
Last active May 3, 2021
all wikipedia zim torrent links
View links.json