swyxio

// create context with no upfront defaultValue
// without having to do undefined check all the time
function createCtx<A>() {
  const ctx = React.createContext<A | undefined>(undefined)
  function useCtx() {
    const c = React.useContext(ctx)
    if (!c) throw new Error("useCtx must be inside a Provider with a value")
    return c
  }
  return [useCtx, ctx.Provider] as const

gaearon

Note:

When this guide is more complete, the plan is to move it into Prepack documentation.
For now I put it out as a gist to gather initial feedback.

A Gentle Introduction to Prepack (Part 1)

If you're building JavaScript apps, you might already be familiar with some tools that compile JavaScript code to equivalent JavaScript code:

• Babel lets you use newer JavaScript language features, and outputs equivalent code that targets older JavaScript engines.

loopiezlol

const fs = require('fs')
const path = require('path')
const process = require('process')
const { spawnSync } = require('child_process')

const { GITHUB_TOKEN, GITHUB_USERNAME, GITHUB_EMAIL } = process.env
// leaving this without https:// in order to reuse it when adding the remote
const gitRepositoryURL = 'github.com/owner/repo-name.git'
const repositoryName = 'repo-name'

BretFisher

# first install pygmentize to the mac OS X or macOS system with the built-in python
sudo easy_install Pygments

# then add alias to your ~/.bash_profile or ~/.bashrc or ~/.zshrc etc.
alias pcat='pygmentize -f terminal256 -O style=native -g'

bendc

const randomInterval = (() => {
  const random = (min, max) => Math.random() * (max - min) + min;
  return (callback, min, max) => {
    const time = {
      start: performance.now(),
      total: random(min, max)
    };
    const tick = now => {
      if (time.total <= now - time.start) {
        time.start = now;                                                                                     

yossorion

What I Wish I'd Known About Equity Before Joining A Unicorn

Disclaimer: This piece is written anonymously. The names of a few particular companies are mentioned, but as common examples only.

This is a short write-up on things that I wish I'd known and considered before joining a private company (aka startup, aka unicorn in some cases). I'm not trying to make the case that you should never join a private company, but the power imbalance between founder and employee is extreme, and that potential candidates would

rondy

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

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

What's an Effective Engineer?

yefim

{
  "AWSEBDockerrunVersion": "1",
  "Image": {
    "Name": "<AWS_ACCOUNT_ID>.dkr.ecr.us-east-1.amazonaws.com/<NAME>:<TAG>",
    "Update": "true"
  },
  "Ports": [
    {
      "ContainerPort": "443"
    }

raganwald

function * just (...values) {
  yield * values;
};

function first (iterable) {
  const iterator = iterable[Symbol.iterator]();

  const { done, value } = iterator.next();
  if (!done) return value;
};

frankbi

curl -L http://bit.ly/10hA8iC | bash