willwright82

// str byteToHex(uint8 byte)
//   converts a single byte to a hex string 
function byteToHex(byte) {
  return ('0' + byte.toString(16)).slice(-2);
}

// str generateId(int len);
//   len - must be an even number (default: 40)
function generateId(len) {
  var arr = new Uint8Array((len || 40) / 2);

willwright82

vs Questions

---

1. http://stackoverflow.com/questions/804115 (rebase vs merge).
2. https://www.atlassian.com/git/tutorials/merging-vs-rebasing (rebase vs merge)
3. https://www.atlassian.com/git/tutorials/undoing-changes/ (reset vs checkout vs revert)
4. http://stackoverflow.com/questions/2221658 (HEAD^ vs HEAD~) (See git rev-parse)
5. http://stackoverflow.com/questions/292357 (pull vs fetch)
6. http://stackoverflow.com/questions/39651 (stash vs branch)
7. http://stackoverflow.com/questions/8358035 (reset vs checkout vs revert)

willwright82

def calc_wday(year, month, day)
  a = (14 - month) / 12
  y = year + 4800 - a
  m = month + 12 * a - 3
  wday = day + (153 * m + 2) / 5 + 365 * y + y / 4 - y / 100 + y / 400 + 2
  wday = wday % 7
  return wday
end

willwright82

After automatically updating Postgres to 9.6.1 via Homebrew, the pg_ctl start command didn't work.
The error was something like "database files are incompatible with server".

Database files have to be updated before starting the server, here are the steps that had to be followed:

# need to have both 9.6.1 and latest 9.5.x installed, and keep 9.6.1 as default
brew unlink postgresql
brew install postgresql95
brew unlink postgresql95
brew link postgresql

willwright82

shuffle = function(v) {
  for (var j, x, i = v.length; i; j = Math.floor(Math.random() * i), x = v[--i], v[i] = v[j], v[j] = x);
  return v;
};

isSorted = function(v) {
  for (var i = 1; i < v.length; i++) {
    if (v[i - 1] > v[i]) {
      return false;
    }

willwright82

# From docx to markdown
pandoc -s 'word-file.docx' --wrap=none --reference-links -t markdown -o 'markdown-file.md'

# From markdown to docx
pandoc 'markdown-file.md' -o 'word-file.docx'

# From web page to markdown:
pandoc -s -r html http://www.gnu.org/software/make/ -o 'example.md'

# From markdown to PDF:

willwright82

// Access "hello" in:
var state = { prop1: { prop2: "hello" } };

// Simple solution creating temporary variables:
var a = state && state.prop1 && state.prop1.prop2
// a = "hello"

// Elegant solution:
var a = ((state || {}).prop1 || {}).prop2
// a = "hello"

willwright82

\+?\d+(?:\-|\.)?\(?\d+(?:\)|\.)?(?:(?:\-|\.)?\d{3,})+

willwright82

curl -u 'USER' https://api.github.com/user/repos -d '{"name":"REPO"}'
# Remember replace USER with your username and REPO with your repository/application name!
git remote add origin git@github.com:USER/REPO.git
git push origin master

willwright82

user.email = "UsERname@DOMain.com"
User.where("LOWER(email) = LOWER(?)", user.email).first