Vue 2 vs Qwik: A Comprehensive Comparison

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In the world of frontend development, Vue 2 and Qwik represent two different approaches to building web applications. While Vue 2 is a mature framework with a rich ecosystem, Qwik introduces a revolutionary approach with resumable reactivity and zero hydration. Let’s explore their differences and use cases.

Table of Contents

1. Core Concepts
2. Reactivity and State Management
3. Templating and Components
4. DOM Manipulation
5. Event Handling
6. Component Composition
7. Form Handling
8. Lifecycle Management
9. Performance and Bundle Size
10. Learning Curve
11. Conclusion

Core Concepts

Vue 2 and Qwik take fundamentally different approaches to building web applications:

• Vue 2 uses a progressive framework approach with a virtual DOM and component-based architecture
• Qwik introduces resumable reactivity with zero hydration, focusing on instant page loads and progressive enhancement

Reactivity and State Management

State Declaration

Both frameworks offer different ways to declare and manage state:

Vue 2’s Approach

<script>
export default {
  data() {
    return {
      name: "John",
    };
  },
};
</script>

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

Vue 2 uses a component-based approach with a data function.

Qwik’s Approach

import { component$, useSignal } from "@builder.io/qwik";

export const Name = component$(() => {
  const name = useSignal("John");

  return <h1>Hello {name.value}</h1>;
});

Qwik uses signals for fine-grained reactivity and resumability.

State Updates

Vue 2

<script>
export default {
  data() {
    return {
      name: "John",
    };
  },
  created() {
    this.name = "Jane";
  },
};
</script>

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

Qwik

import { component$, useTask$, useSignal } from "@builder.io/qwik";

export const Name = component$(() => {
  const name = useSignal("John");

  useTask$(() => {
    name.value = "Jane";
  });

  return <h1>Hello {name.value}</h1>;
});

Computed Values

Vue 2

<script>
export default {
  data() {
    return {
      count: 10,
    };
  },
  computed: {
    doubleCount() {
      return this.count * 2;
    },
  },
};
</script>

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

Qwik

import { component$, useSignal, useComputed$ } from "@builder.io/qwik";

export const DoubleCount = component$(() => {
  const count = useSignal(10);
  const doubleCount = useComputed$(() => count.value * 2);

  return <div>{doubleCount.value}</div>;
});

DOM Manipulation

List Rendering

Vue 2

<script>
export default {
  data() {
    return {
      colors: ["red", "green", "blue"],
    };
  },
};
</script>

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

Qwik

import { component$ } from "@builder.io/qwik";

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

Event Handling

Vue 2

<script>
export default {
  data() {
    return {
      count: 0,
    };
  },
  methods: {
    incrementCount() {
      this.count++;
    },
  },
};
</script>

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

Qwik

import { component$, useSignal, $ } from "@builder.io/qwik";

export const Counter = component$(() => {
  const count = useSignal(0);

  const incrementCount = $(() => {
    count.value++;
  });

  return (
    <>
      <p>Counter: {count.value}</p>
      <button onClick$={incrementCount}>Increment</button>
    </>
  );
});

Form Handling

Text Input

Vue 2

<script>
export default {
  data() {
    return {
      text: "Hello World",
    };
  },
};
</script>

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

Qwik

import { component$, useSignal } from "@builder.io/qwik";

const InputHello = component$(() => {
  const text = useSignal("");

  return (
    <>
      <p>{text.value}</p>
      <input bind:value={text} />
    </>
  );
});

Lifecycle Management

Component Mounting

Vue 2

<script>
export default {
  data() {
    return {
      pageTitle: "",
    };
  },
  mounted() {
    this.pageTitle = document.title;
  },
};
</script>

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

Qwik

import { component$, useVisibleTask$, useStore } from "@builder.io/qwik";

export const App = component$(() => {
  const store = useStore({
    pageTitle: "",
  });

  useVisibleTask$(() => {
    store.pageTitle = document.title;
  });

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

Performance and Bundle Size

Vue 2

• Virtual DOM-based updates
• Progressive framework
• Rich ecosystem
• Moderate bundle size

Qwik

• Zero hydration overhead
• Resumable applications
• Fine-grained lazy loading
• Progressive JavaScript loading

Learning Curve

Vue 2

• Moderate learning curve
• Component-based architecture
• Rich ecosystem to learn
• Build setup required

Qwik

• Steeper learning curve
• New concepts (resumability)
• React-like JSX syntax
• Strong TypeScript integration

Conclusion

Choose Vue 2 if you:

• Need a progressive framework
• Want a gentle learning curve
• Need a rich ecosystem
• Are building traditional web applications
• Value template-based development

Choose Qwik if you:

• Need instant page loads
• Want zero hydration overhead
• Need fine-grained lazy loading
• Are building large-scale applications
• Value progressive enhancement

Both frameworks excel in different scenarios:

• Vue 2 is perfect for teams that want a flexible, progressive framework
• Qwik shines in applications where instant loading and progressive enhancement are crucial

The choice between Vue 2 and Qwik often depends on your project’s requirements:

• Use Vue 2 for building traditional applications with a gentle learning curve
• Use Qwik for building modern applications that need instant loading and progressive enhancement

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