andy-thomason

Genomics - A programmer's guide.

Andy Thomason is a Senior Programmer at Genomics PLC. He has been witing graphics systems, games and compilers since the '70s and specialises in code performance.

https://www.genomicsplc.com

LarryWeiss

########################################################################################################
# 
#  .SYNOPSIS
#   
#     PowerShell function that returns the file encoding name as a string.
#      
#        _____ _                        ______ _ _      ______                     _ _             
#       / ____| |                      |  ____(_) |    |  ____|                   | (_)            
#      | (___ | |__   _____      ______| |__   _| | ___| |__   _ __   ___ ___   __| |_ _ __   __ _ 
#       \___ \| '_ \ / _ \ \ /\ / /____|  __| | | |/ _ \  __| | '_ \ / __/ _ \ / _` | | '_ \ / _` |

gaearon

If you use server rendering, keep in mind that neither useLayoutEffect nor useEffect can run until the JavaScript is downloaded.

You might see a warning if you try to useLayoutEffect on the server. Here's two common ways to fix it.

Option 1: Convert to useEffect

If this effect isn't important for first render (i.e. if the UI still looks valid before it runs), then useEffect instead.

function MyComponent() {

ryanflorence

import React, { Suspense, useState } from "react";
import { unstable_createResource as createResource } from "react-cache";
import {
  Combobox,
  ComboboxInput,
  ComboboxList,
  ComboboxOption
} from "./Combobox2.js";

function App({ tabIndex, navigate }) {

ryanflorence

let UserContext = React.createContext();

class App extends React.Component {
  state = {
    user: null,
    setUser: user => {
      this.setState({ user });
    }
  };

swyxio

2019 update: this essay has been updated on my personal site, together with a followup on how to get started

2020 update: I'm now writing a book with updated versions of all these essays and 35 other chapters!!!!

1. Learn in public

If there's a golden rule, it's this one, so I put it first. All the other rules are more or less elaborations of this rule #1.

You already know that you will never be done learning. But most people "learn in private", and lurk. They consume content without creating any themselves. Again, that's fine, but we're here to talk about being in the top quintile. What you do here is to have a habit of creating learning exhaust. Write blogs and tutorials and cheatsheets. Speak at meetups and conferences. Ask and answer things on Stackoverflow or Reddit. (Avoid the walled gardens like Slack and Discourse, they're not public). Make Youtube videos

bvaughn

React recently introduced an experimental profiler API. This page gives instructions on how to use this API in a production release of your app.

Table of Contents

• Profiling in production
  • Create React App
  • Webpack 4

Profiling in production

React DOM automatically supports profiling in development mode for v16.5+, but since profiling adds some small additional overhead it is opt-in for production mode. This gist explains how to opt-in.

DavidWells

[Settings]
ID = "Your_Site_ID"

# Settings in the [build] context are global and are applied to all contexts unless otherwise overridden by more specific contexts.

[build]
  # This is the directory to change to before starting a build.
  base    = "project/"
  # NOTE: This is where we will look for package.json/.nvmrc/etc, not root.
  # This is the directory that you are publishing from (relative to root of your repo)

swalkinshaw

Moved to Shopify/graphql-design-tutorial

bvaughn

// This is an advanced example! It is not intended for use in application code.
// Libraries like Relay may make use of this technique to save some time on low-end mobile devices.
// Most components should just initiate async requests in componentDidMount.

class ExampleComponent extends React.Component {
  _hasUnmounted = false;

  state = {
    externalData: null,
  };