rtmalone

const copyToClipboard = str => {
  const el = document.createElement('textarea');  // Create a <textarea> element
  el.value = str;                                 // Set its value to the string that you want copied
  el.setAttribute('readonly', '');                // Make it readonly to be tamper-proof
  el.style.position = 'absolute';                 
  el.style.left = '-9999px';                      // Move outside the screen to make it invisible
  document.body.appendChild(el);                  // Append the <textarea> element to the HTML document
  const selected =            
    document.getSelection().rangeCount > 0        // Check if there is any content selected previously
      ? document.getSelection().getRangeAt(0)     // Store selection if found

rtmalone

Name of thing	Sorta like...	Mounted?	Can you even setState?	What would you say... ya do here?
constructor	initialize()	nope	nope	init stuff NO side effects
componentWillMount	beforeDomReady()	nope	yeah but don't	Only needed in createClass now use constructor for most things
render	render	nope	please no	render stuff and don't set any state please
componentDidMount	domReady()	yup	yup	DOM is a go init jQuery plugins dispatch stuff
componentWillReceiveProps	onChange()	yup	yup

rtmalone

import React from 'react';
import injectStyle from './path/to/injectStyle';

export default class SampleComponent extends React.Component {
  constructor(props) {
    super(props);
    
    const keyframesStyle = `
      @-webkit-keyframes pulse {
        0%   { background-color: #fecd6d; }