seoh

Keybase proof

I hereby claim:

• I am seoh on github.
• I am seoh (https://keybase.io/seoh) on keybase.
• I have a public key whose fingerprint is 3F6B 402B C421 9BD0 D5AE 3C27 8DFA C8F5 E0E6 BA93

To claim this, I am signing this object:

seoh

// https://www.cs.nott.ac.uk/~gmh/monparsing.pdf

//
// type Parser[T] = String -> [(T, String)]
//


/** lookahead token
 *
 * Parser -> Parser

seoh

/**
 * so many type of chaining
 */

//// about dot-indentation.
// type 1-1. align with dot.
const ret = obj.method1()
               .method2()
               .method3()
               .value();

seoh

const prefixes = (prev, next) => prev ? `${prev}[${next}]` : next

const serialize = (key, value, prefix = '') => {
  switch(value.constructor.name) {
    case "Array": return value.map((obj, i) => serialize(i+ "", obj, prefixes(prefix, key))).join('&')
    case "Object": return parse(value, prefixes(prefix, key))
    default: return prefixes(prefix, key) + '=' + value
  }
}

seoh

1. Real World Cats, 엄익훈(카카오)
   • slide
   • repo
2. Shapeless를 이용한 제네릭 프로그래밍: 컴파일러 괴롭히고 단순 작업 줄이기, 박지수(두물머리)
   • slide
   • repo
3. Akka in Practice, 황성현(레이니스트, 뱅크샐러드)
   • slide
4. 배포 후 장애를 대응하는 스마트한 방법. 카나리 릴리즈. 최명규, (비바리퍼블리카, Toss)

seoh

gif-from-tweet

There are so many great GIFs out there and I want to have copies of them. Twitter makes that harder than it should be by converting them to MP4 and not providing access to the source material. To make it easier, I made a fish pipeline that takes a tweet URL and a filename, extracts the MP4 from that tweet and uses ffmpeg to convert back to GIF.

Dependencies

• ffmpeg
  • macOS: brew install ffmpeg
  • Ubuntu/Debian: apt install ffmpeg

seoh

call plug#begin('~/.vim/plugged')

" Shorthand notation; fetches https://github.com/junegunn/vim-easy-align
Plug 'junegunn/vim-easy-align'
Plug 'junegunn/seoul256.vim'
Plug 'junegunn/goyo.vim'

Plug '/usr/local/opt/fzf'
Plug 'junegunn/fzf.vim'

seoh

seoh

// from https://etherworld.co/2017/11/17/understanding-the-concept-of-private-key-public-key-and-address-in-ethereum-blockchain/

const EC = require('elliptic').ec
const BN = require('bn.js')
const ec = new EC('secp256k1')
const keccak256 = require('js-sha3').keccak256

const G = ec.g
const privateKey = process.argv[2]
const pk = new BN(privateKey)

seoh

object Main extends App {

  // boilerplate
  import scala.reflect.runtime.universe._
  def show[T](value: T)(implicit tag: TypeTag[T])
    = tag.toString.replace("Main.", "")


  // type-level programming