React vs Ember Octane comparison

Declare state

React

Name.jsx

import { useState } from "react";

export default function Name() {
  const [name] = useState("John");

  return <h1>Hello {name}</h1>;
}

Ember Octane

name.hbs

<h1>Hello {{this.name}}</h1>

Update state

React

Name.jsx

import { useEffect, useState } from "react";

export default function Name() {
  const [name, setName] = useState("John");

  useEffect(() => {
    setName("Jane");
  }, []);

  return <h1>Hello {name}</h1>;
}

Ember Octane

name.hbs

<h1>Hello {{this.name}}</h1>

Computed state

React

DoubleCount.jsx

import { useState } from "react";

export default function DoubleCount() {
  const [count] = useState(10);
  const doubleCount = count * 2;

  return <div>{doubleCount}</div>;
}

Ember Octane

double-count.hbs

<div>{{this.doubleCount}}</div>

Templating

Minimal template

React

HelloWorld.jsx

export default function HelloWorld() {
  return <h1>Hello world</h1>;
}

Ember Octane

hello-world.hbs

<h1>Hello world</h1>

Styling

React

CssStyle.jsx

import "./style.css";

export default function CssStyle() {
  return (
    <>
      <h1 className="title">I am red</h1>
      <button style={{ fontSize: "10rem" }}>I am a button</button>
    </>
  );
}

Ember Octane

css-style.css

/* using: https://github.com/salsify/ember-css-modules */
.title {
  color: red;
}

Loop

React

Colors.jsx

export default function Colors() {
  const colors = ["red", "green", "blue"];
  return (
    <ul>
      {colors.map((color) => (
        <li key={color}>{color}</li>
      ))}
    </ul>
  );
}

Ember Octane

colors.hbs

<ul>
  {{#each (array "red" "green" "blue") as |color|}}
    <li>{{color}}</li>
  {{/each}}
</ul>

Event click

React

Counter.jsx

import { useState } from "react";

export default function Counter() {
  const [count, setCount] = useState(0);

  function incrementCount() {
    setCount((count) => count + 1);
  }

  return (
    <>
      <p>Counter: {count}</p>
      <button onClick={incrementCount}>+1</button>
    </>
  );
}

Ember Octane

counter.hbs

<p>Counter: {{this.count}}</p>
<button {{on "click" this.incrementCount}}>+1</button>

Dom ref

React

InputFocused.jsx

import { useEffect, useRef } from "react";

export default function InputFocused() {
  const inputElement = useRef(null);

  useEffect(() => inputElement.current.focus(), []);

  return <input type="text" ref={inputElement} />;
}

Ember Octane

input-focused.hbs

<input {{this.autofocus}} />

Conditional

React

TrafficLight.jsx

import { useState } from "react";

const TRAFFIC_LIGHTS = ["red", "orange", "green"];

export default function TrafficLight() {
  const [lightIndex, setLightIndex] = useState(0);

  const light = TRAFFIC_LIGHTS[lightIndex];

  function nextLight() {
    setLightIndex((lightIndex + 1) % TRAFFIC_LIGHTS.length);
  }

  return (
    <>
      <button onClick={nextLight}>Next light</button>
      <p>Light is: {light}</p>
      <p>
        You must
        {light === "red" && <span>STOP</span>}
        {light === "orange" && <span>SLOW DOWN</span>}
        {light === "green" && <span>GO</span>}
      </p>
    </>
  );
}

Ember Octane

traffic-light.hbs

<button {{on "click" this.nextLight}}>Next light</button>
<p>Light is: {{this.light}}</p>
<p>
  You must
  {{#if (eq this.light "red")}}
    STOP
  {{else if (eq this.light "orange")}}
    SLOW DOWN
  {{else if (eq this.light "green")}}
    GO
  {{/if}}
</p>

Lifecycle

On mount

React

PageTitle.jsx

import { useState, useEffect } from "react";

export default function PageTitle() {
  const [pageTitle, setPageTitle] = useState("");

  useEffect(() => {
    setPageTitle(document.title);
  }, []);

  return <p>Page title: {pageTitle}</p>;
}

Ember Octane

page-title.hbs

<p>Page title is: {{(this.pageTitle)}}</p>

On unmount

React

Time.jsx

import { useState, useEffect } from "react";

export default function Time() {
  const [time, setTime] = useState(new Date().toLocaleTimeString());

  useEffect(() => {
    const timer = setInterval(() => {
      setTime(new Date().toLocaleTimeString());
    }, 1000);

    return () => clearInterval(timer);
  }, []);

  return <p>Current time: {time}</p>;
}

Ember Octane

time.hbs

<p>Current time: {{this.time}}</p>

Component composition

Props

React

App.jsx

import UserProfile from "./UserProfile.jsx";

export default function App() {
  return (
    <UserProfile
      name="John"
      age={20}
      favouriteColors={["green", "blue", "red"]}
      isAvailable
    />
  );
}

Ember Octane

app.hbs

<UserProfile
  @name="John"
  @age={{20}}
  @favouriteColors={{array "green" "blue" "red"}}
  @isAvailable={{true}}
/>

Emit to parent

React

App.jsx

import { useState } from "react";
import AnswerButton from "./AnswerButton.jsx";

export default function App() {
  const [isHappy, setIsHappy] = useState(true);

  function onAnswerNo() {
    setIsHappy(false);
  }

  function onAnswerYes() {
    setIsHappy(true);
  }

  return (
    <>
      <p>Are you happy?</p>
      <AnswerButton onYes={onAnswerYes} onNo={onAnswerNo} />
      <p style={{ fontSize: 50 }}>{isHappy ? "😀" : "😥"}</p>
    </>
  );
}

Ember Octane

app.hbs

<p>Are you happy?</p>
<AnswerButton @onYes={{this.handleYes}} @onNo={{this.handleNo}} />
<p style="font-size: 50px;">{{if this.isHappy "😀" "😥"}}</p>

Slot

React

App.jsx

import FunnyButton from "./FunnyButton.jsx";

export default function App() {
  return <FunnyButton>Click me!</FunnyButton>;
}

Ember Octane

app.hbs

<FunnyButton> Click me! </FunnyButton>

Slot fallback

React

App.jsx

import FunnyButton from "./FunnyButton.jsx";

export default function App() {
  return (
    <>
      <FunnyButton />
      <FunnyButton>I got content!</FunnyButton>
    </>
  );
}

Ember Octane

app.hbs

<FunnyButton />
<FunnyButton>I got content!</FunnyButton>

Context

React

App.jsx

import { useState } from "react";
import UserProfile from "./UserProfile";
import { UserContext } from "./UserContext";

export default function App() {
  const [user, setUser] = useState({
    id: 1,
    username: "unicorn42",
    email: "unicorn42@example.com",
  });

  function updateUsername(newUsername) {
    setUser((userData) => ({ ...userData, username: newUsername }));
  }

  return (
    <>
      <h1>Welcome back, {user.username}</h1>
      <UserContext.Provider value={{ ...user, updateUsername }}>
        <UserProfile />
      </UserContext.Provider>
    </>
  );
}

Ember Octane

app.hbs

<UserProfile />

Form input

Input text

React

InputHello.jsx

import { useState } from "react";

export default function InputHello() {
  const [text, setText] = useState("Hello world");

  function handleChange(event) {
    setText(event.target.value);
  }

  return (
    <>
      <p>{text}</p>
      <input value={text} onChange={handleChange} />
    </>
  );
}

Ember Octane

input-hello.hbs

<p>{{this.text}}</p>
<input value={{this.text}} {{on "input" this.handleInput}} />

Checkbox

React

IsAvailable.jsx

import { useState } from "react";

export default function IsAvailable() {
  const [isAvailable, setIsAvailable] = useState(false);

  function handleChange() {
    setIsAvailable(!isAvailable);
  }

  return (
    <>
      <input
        id="is-available"
        type="checkbox"
        checked={isAvailable}
        onChange={handleChange}
      />
      <label htmlFor="is-available">Is available</label>
    </>
  );
}

Ember Octane

is-available.hbs

<input
  id="is-available"
  type="checkbox"
  checked={{this.isAvailable}}
  {{on "change" this.handleChange}}
/>
<label for="is-available">Is available</label>

Radio

React

PickPill.jsx

import { useState } from "react";

export default function PickPill() {
  const [picked, setPicked] = useState("red");

  function handleChange(event) {
    setPicked(event.target.value);
  }

  return (
    <>
      <div>Picked: {picked}</div>

      <input
        id="blue-pill"
        checked={picked === "blue"}
        type="radio"
        value="blue"
        onChange={handleChange}
      />
      <label htmlFor="blue-pill">Blue pill</label>

      <input
        id="red-pill"
        checked={picked === "red"}
        type="radio"
        value="red"
        onChange={handleChange}
      />
      <label htmlFor="red-pill">Red pill</label>
    </>
  );
}

Ember Octane

pick-pill.hbs

<div>Picked: {{this.picked}}</div>

<input
  id="blue-pill"
  type="radio"
  value="blue"
  checked={{eq this.picked "blue"}}
  {{on "change" this.handleChange}}
/>
<label htmlFor="blue-pill">Blue pill</label>

<input
  id="red-pill"
  type="radio"
  value="red"
  checked={{eq this.picked "red"}}
  {{on "change" this.handleChange}}
/>
<label htmlFor="red-pill">Red pill</label>

Select

React

ColorSelect.jsx

import { useState } from "react";

const colors = [
  { id: 1, text: "red" },
  { id: 2, text: "blue" },
  { id: 3, text: "green" },
  { id: 4, text: "gray", isDisabled: true },
];

export default function ColorSelect() {
  const [selectedColorId, setSelectedColorId] = useState(2);

  function handleChange(event) {
    setSelectedColorId(event.target.value);
  }

  return (
    <select value={selectedColorId} onChange={handleChange}>
      {colors.map((color) => (
        <option key={color.id} value={color.id} disabled={color.isDisabled}>
          {color.text}
        </option>
      ))}
    </select>
  );
}

Ember Octane

color-select.hbs

<select {{on "change" this.select}}>
  {{#each this.colors as |color|}}
    <option
      value={{color.id}}
      disabled={{color.isDisabled}}
      selected={{eq color.id this.selectedColorId}}
    >
      {{color.text}}
    </option>
  {{/each}}
</select>

Webapp features

Render app

React

index.html

<!DOCTYPE html>
<html>
  <body>
    <div id="app"></div>
    <script type="module" src="./main.jsx"></script>
  </body>
</html>

Ember Octane

Missing snippet

Fetch data

React

App.jsx

import useFetchUsers from "./useFetchUsers";

export default function App() {
  const { isLoading, error, data: users } = useFetchUsers();

  return (
    <>
      {isLoading ? (
        <p>Fetching users...</p>
      ) : error ? (
        <p>An error occurred while fetching users</p>
      ) : (
        users && (
          <ul>
            {users.map((user) => (
              <li key={user.login.uuid}>
                <img src={user.picture.thumbnail} alt="user" />
                <p>
                  {user.name.first} {user.name.last}
                </p>
              </li>
            ))}
          </ul>
        )
      )}
    </>
  );
}

Ember Octane

app.hbs

{{#let (this.fetchUsers) as |request|}}
  {{#if request.isLoading}}

    <p>Fetching users...</p>

  {{else if request.error}}

    <p>An error occurred while fetching users</p>

  {{else}}

    <ul>
      {{#each request.users as |user|}}
        <li>
          <img src={{user.picture.thumbnail}} alt="user" />
          <p>{{user.name.first}} {{user.name.last}}</p>
        </li>
      {{/each}}
    </ul>

  {{/if}}
{{/let}}

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