React

Installation

// initialize a nodejs project (creates package.json)
$ npm init -y

// package manager 
$ npm install yarn

$ yarn install packagename

$ yarn remove packagename

JavaScript

Kangax compatibility table

Three ways to declare variables are

1. const
2. var
3. let

Template string

console.log(`${lastName}, ${firstName} ${middleName}`);

document.body.innerHTML = `
<section>
  <header>
      <h1>The React Blog</h1>
  </header>
  <article>
      <h2>${article.title}</h2>
      ${article.body}
  </article>
  <footer>
      <p>copyright ${new Date().getYear()} | The React Blog</p>
  </footer>
</section>
`;

Function declaration vs function expression: declarations are hoisted

const f = function() {
};

Arrow functions

const lordify = function(firstName) {
  return `${firstName} of Canterbury`;
};

// equals

const lordify = firstName => `${firstName} of Canterbury`;