a = a || 3;

b = b || 4;

[a, b] = [3, 4];

a = 3;

b = 4;

a = a && 3;

b = b && 4;

a = b = 3;

IIFE

logical comparison

default parameters

smart condition

arrow function

Add the conditional (!event.phase === bubbling) to the handler function

There is no capture phase on events

Add the conditional (event.phase === capture) to the handler function

All answers are wrong

This lifecycle is invoked after an error has been thrown by a root component

This lifecycle is invoked right before calling the render method, both on the initial mount and on subsequent updates

This lifecycle is invoked after an error has been thrown by a descendant component

This lifecycle invoked right before the most recently rendered output is committed to e.g. the DOM

Dispatcher

Action

State

Store

Reducer

only once

never

on every other click on a button

this code causes an infinite loop of rendering

on every click on a button

subscriber

store

action creator

action

dispatcher