christophermark

Change the directory where screenshots are saved on Mac

mkdir ~/Screenshots
defaults write com.apple.screencapture location ~/Screenshots

christophermark

/**
 * Adds transparency to a hex color by appending an alpha value.
 *
 * @param hexColor - A 6-digit hex color string (e.g., '#C1E38C' or 'C1E38C')
 * @param alpha - A number between 0 (fully transparent) and 1 (fully opaque)
 * @returns An 8-digit hex color string with the alpha value appended
 *
 * @example
 * withAlpha('#C1E38C', 0.4)  // Returns '#C1E38C66'
 * withAlpha('#FF0000', 0.5)  // Returns '#FF000080'

christophermark

1. Prevent losing the message in the first place

If you know ahead of time that you want to “undo” a commit without losing either your changes or your commit message, use soft reset:
# Move HEAD one commit back, but keep index & working-tree untouched

git reset --soft HEAD~1

	•	What it does
	•	HEAD moves to the previous commit
	•	Your index (staging area) still contains exactly what you had in that commit

christophermark

https://stackoverflow.com/questions/29914052/how-to-git-rebase-a-branch-with-the-onto-command/29916361#29916361

git rebase --onto <newparent> <oldparent>


// Most frequent usage, after base branch is squashed and merged into main
git rebase --onto main [SHA before first commit on your branch]

christophermark

// Exclude test files from VSCode searches
**/*.test.*

christophermark

# Prints out the iOS version number
printIosVersion() {
  sed -n 'N;s/.*CFBundleShortVersionString.*>\([0-9]*\.[0-9]*\.[0-9]*\).*/\1/p' ios/Compass/Info.plist
}

# Sets the iOS version number
#
# {$1} The new version number to set
###### Documentation ######
# sed -i '' '                              # -i '' will modify the file and save it

christophermark

/**
 * Set the system time for our tests.
 * This ensures that our tests can't fail based on the local time of the CI machine.
 * This guards against app code where the behavior changes based on the device time.
 * For example, a test might fail if we attempt to set the search time "before now".
 */
beforeAll(() => {
  // @TODO: 'modern' is default once we upgrade to Jest 27 https://jestjs.io/blog/2020/05/05/jest-26#new-fake-timers
  jest.useFakeTimers("modern");
  const JS_DATE_11_AM = new Date(new Date().setHours(11, 0, 0, 0));

christophermark

On OS X:

brew install nmap
nmap --script ssl-enum-ciphers -p 443 example.server.com

Example output

Starting Nmap 7.40 ( https://nmap.org ) at 2017-05-18 15:34 CEST
Nmap scan report for example.server.com (1.2.3.4)
Host is up (0.036s latency).

christophermark

 git status | egrep -v '.js|.png'

christophermark

componentDidUpdate(prevProps) {
    console.log("Render update diff:");

    const now = Object.entries(this.props);
    const added = now.filter(([key, val]) => {
      if (prevProps[key] === undefined && val !== undefined) return true;
      if (prevProps[key] !== val) {
        console.log(`${key}
          + ${JSON.stringify(val)}
          - ${JSON.stringify(prevProps[key])}`);