Vue 3 vs Ember Polaris Comparison

Declare state

Vue 3

<script setup>
import { ref } from "vue";
const name = ref("John");
</script>

<template>
  <h1>Hello {{ name }}</h1>
</template>

Ember Polaris (preview)

import Component from "@glimmer/component";

export default class NameComponent extends Component {
  name = "John";

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

Update state

Vue 3

<script setup>
import { ref } from "vue";
const name = ref("John");
name.value = "Jane";
</script>

<template>
  <h1>Hello {{ name }}</h1>
</template>

Ember Polaris (preview)

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";

export default class CounterComponent extends Component {
  @tracked name = "John";

  constructor(owner, args) {
    super(owner, args);

    this.name = "Jane";
  }

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

Computed state

Vue 3

<script setup>
import { ref, computed } from "vue";
const count = ref(10);
const doubleCount = computed(() => count.value * 2);
</script>

<template>
  <div>{{ doubleCount }}</div>
</template>

Ember Polaris (preview)

import Component, { tracked } from "@glimmer/component";

export default class DoubleCount extends Component {
  @tracked count = 10;

  get doubleCount() {
    return this.count * 2;
  }

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

Templating

Minimal template

Vue 3

<template>
  <h1>Hello world</h1>
</template>

Ember Polaris (preview)

<template>
  <h1>Hello world</h1>
</template>

Styling

Vue 3

<template>
  <h1 class="title">I am red</h1>
  <button style="font-size: 10rem">I am a button</button>
</template>

<style scoped>
.title {
  color: red;
}
</style>

Ember Polaris (preview)

<template>
  <h1 class="title">I am red</h1>
  <button style="font-size: 10rem;">I am a button</button>

  <style>
    .title {
      color: red;
    }
  </style>
</template>

Loop

Vue 3

<script setup>
const colors = ["red", "green", "blue"];
</script>

<template>
  <ul>
    <li v-for="color in colors" :key="color">
      {{ color }}
    </li>
  </ul>
</template>

Ember Polaris (preview)

const colors = ["red", "green", "blue"];

<template>
  <ul>
    {{#each colors as |color|}}
      <li>{{color}}</li>
    {{/each}}
  </ul>
</template>

Event click

Vue 3

<script setup>
import { ref } from "vue";
const count = ref(0);

function incrementCount() {
  count.value++;
}
</script>

<template>
  <p>Counter: {{ count }}</p>
  <button @click="incrementCount">+1</button>
</template>

Ember Polaris (preview)

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";
import { on } from "@ember/modifier";

export default class Counter extends Component {
  @tracked count = 0;

  incrementCount = () => this.count++;

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

DOM ref

Vue 3

<script setup>
import { useTemplateRef, onMounted } from "vue";

const inputElement = useTemplateRef("inputElement");

onMounted(() => {
  inputElement.value.focus();
});
</script>

<template>
  <input ref="inputElement" />
</template>

Ember Polaris (preview)

import { modifier } from "ember-modifier";

const autofocus = modifier((element) => element.focus());

<template>
  <input {{autofocus}} />
</template>

Conditional

Vue 3

<script setup>
import { ref, computed } from "vue";
const TRAFFIC_LIGHTS = ["red", "orange", "green"];
const lightIndex = ref(0);

const light = computed(() => TRAFFIC_LIGHTS[lightIndex.value]);

function nextLight() {
  lightIndex.value = (lightIndex.value + 1) % TRAFFIC_LIGHTS.length;
}
</script>

<template>
  <button @click="nextLight">Next light</button>
  <p>Light is: {{ light }}</p>
  <p>
    You must
    <span v-if="light === 'red'">STOP</span>
    <span v-else-if="light === 'orange'">SLOW DOWN</span>
    <span v-else-if="light === 'green'">GO</span>
  </p>
</template>

Ember Polaris (preview)

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";
import { on } from "@ember/modifier";
import { eq } from 'ember-truth-helpers';

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

export default class TrafficLight extends Component {
  @tracked lightIndex = 0;

  get light() {
    return TRAFFIC_LIGHTS[this.lightIndex];
  }

  nextLight = () => {
    this.lightIndex = (this.lightIndex + 1) % TRAFFIC_LIGHTS.length;
  };

  <template>
    <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>
  </template>
}

Lifecycle

On mount

Vue 3

<script setup>
import { ref, onMounted } from "vue";
const pageTitle = ref("");
onMounted(() => {
  pageTitle.value = document.title;
});
</script>

<template>
  <p>Page title: {{ pageTitle }}</p>
</template>

Ember Polaris (preview)

const pageTitle = () => document.title;

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

On unmount

Vue 3

<script setup>
import { ref, onUnmounted } from "vue";

const time = ref(new Date().toLocaleTimeString());

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

onUnmounted(() => {
  clearInterval(timer);
});
</script>

<template>
  <p>Current time: {{ time }}</p>
</template>

Ember Polaris (preview)

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";
import { registerDestructor } from "@ember/destroyable";

export default class Time extends Component {
  @tracked time = new Date().toLocaleTimeString();

  constructor(owner, args) {
    super(owner, args);

    let timer = setInterval(() => {
      this.time = new Date().toLocaleTimeString();
    }, 1000);

    registerDestructor(this, () => clearInterval(timer));
  }

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

Component composition

Props

Vue 3

<script setup>
import UserProfile from "./UserProfile.vue";
</script>

<template>
  <UserProfile
    name="John"
    :age="20"
    :favourite-colors="['green', 'blue', 'red']"
    is-available
  />
</template>

Ember Polaris (preview)

import UserProfile from "./user-profile.gjs";

const favoriteColors = ["green", "blue", "red"];

<template>
  <UserProfile
    @name="John"
    @age={{20}}
    @favouriteColors={{favoriteColors}}
    @isAvailable={{true}}
  />
</template>

Emit to parent

Vue 3

<script setup>
import { ref } from "vue";
import AnswerButton from "./AnswerButton.vue";

let isHappy = ref(true);

function onAnswerNo() {
  isHappy.value = false;
}

function onAnswerYes() {
  isHappy.value = true;
}
</script>

<template>
  <p>Are you happy?</p>
  <AnswerButton @yes="onAnswerYes" @no="onAnswerNo" />
  <p style="font-size: 50px">
    {{ isHappy ? "😀" : "😥" }}
  </p>
</template>

Ember Polaris (preview)

import { on } from "@ember/modifier";

<template>
  <button {{on "click" @onYes}}> YES </button>
  <button {{on "click" @onNo}}> NO </button>
</template>

Slot

Vue 3

<script setup>
import FunnyButton from "./FunnyButton.vue";
</script>

<template>
  <FunnyButton> Click me! </FunnyButton>
</template>

Ember Polaris (preview)

import FunnyButton from "./funny-button";

<template>
  <FunnyButton> Click me! </FunnyButton>
</template>;

Slot fallback

Vue 3

<script setup>
import FunnyButton from "./FunnyButton.vue";
</script>

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

Ember Polaris (preview)

import FunnyButton from "./funny-button";

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

Form input

Input text

Vue 3

<script setup>
import { ref } from "vue";
const text = ref("Hello World");
</script>

<template>
  <p>{{ text }}</p>
  <input v-model="text" />
</template>

Ember Polaris (preview)

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";
import { on } from '@ember/modifier';

export default class InputHello extends Component {
  @tracked text = "Hello World";

  handleInput = (event) => (this.text = event.target.value);

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

Checkbox

Vue 3

<script setup>
import { ref } from "vue";

const isAvailable = ref(true);
</script>

<template>
  <input id="is-available" v-model="isAvailable" type="checkbox" />
  <label for="is-available">Is available</label>
</template>

Ember Polaris (preview)

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";
import { on } from '@ember/modifier';

export default class InputHello extends Component {
  @tracked isAvailable = false;

  handleChange = (event) => (this.isAvailable = event.target.checked);

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

Radio

Vue 3

<script setup>
import { ref } from "vue";

const picked = ref("red");
</script>

<template>
  <div>Picked: {{ picked }}</div>

  <input id="blue-pill" v-model="picked" type="radio" value="blue" />
  <label for="blue-pill">Blue pill</label>

  <input id="red-pill" v-model="picked" type="radio" value="red" />
  <label for="red-pill">Red pill</label>
</template>

Ember Polaris (preview)

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";
import { on } from '@ember/modifier';
import { eq } from 'ember-truth-helpers';

export default class PickPill extends Component {
  @tracked picked = "red";

  handleChange = (event) => (this.picked = event.target.value);

  <template>
    <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>
  </template>
}

Select

Vue 3

<script setup>
import { ref } from "vue";

const selectedColorId = ref(2);

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

<template>
  <select v-model="selectedColorId">
    <option
      v-for="color in colors"
      :key="color.id"
      :value="color.id"
      :disabled="color.isDisabled"
    >
      {{ color.text }}
    </option>
  </select>
</template>

Ember Polaris (preview)

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";
import { on } from '@ember/modifier';

export default class ColorSelect extends Component {
  @tracked selectedColorId = 2;

  select = (event) => (this.selectedColorId = event.target.value);

  isSelected = (colorId) => this.selectedColorId === colorId;

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

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

Webapp features

Render app

Vue 3

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

Fetch data

Vue 3

<script setup>
import useFetchUsers from "./useFetchUsers";

const { isLoading, error, data: users } = useFetchUsers();
</script>

<template>
  <p v-if="isLoading">Fetching users...</p>
  <p v-else-if="error">An error ocurred while fetching users</p>
  <ul v-else-if="users">
    <li v-for="user in users" :key="user.login.uuid">
      <img :src="user.picture.thumbnail" alt="user" />
      <p>
        {{ user.name.first }}
        {{ user.name.last }}
      </p>
    </li>
  </ul>
</template>

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