[pub_2021] 5 important concepts

1. Equality == vs. === (primitives, object "mem ref")
2. Async JS (callbacks, promises, async/await)
3. Error Handling (try..catch, writing defensive code)
4. ES6 Syntax (destructuring, spread operator, string interpolation)
5. Array Methods (map, filter, reduce, sort, some, every)

[2021] Tools for testing accessibility

• Linter - eslint-plugin-jsx-a11y
• Tests - jest-axe/cypress-axe (deque's testing solution)
• Browser tools - Lighthouse