Benchmark: vue updated vs watch

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>

Tests:

watch
new Vue({ template: '<div>{{ value }} {{ count }}</div>', data: () => ({ value: 0, count: 0 }), watch: { value() { this.count++; }, }, });
updated
new Vue({ template: '<div>{{ value }} {{ count }}</div>', data: () => ({ value: 0, count: 0 }), updated() { this.count++; }, });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
watch
updated

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

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**Overview of the Benchmark**

The provided JSON represents a JavaScript benchmark test case hosted on MeasureThat.net. The test compares two approaches: using `watch` and `updated` in Vue.js to increment a counter.

**What is tested?**

In this test, we have a simple Vue.js template that displays the value of `value` and an incremented count. We compare the performance of two methods:

1. **Watch**: The `watch` function is used to observe changes to the `value` property. In this implementation, when `value` changes, the `count` property also increments.
2. **Updated**: The `updated` function is called whenever any part of the component's template changes. In this case, we increment the `count` only when the `updated` hook is invoked.

**Options compared**

The two options being tested are:

1. Using the `watch` function to manually update the `count` property.
2. Using the `updated` hook to automatically update the `count` property.

**Pros and Cons of each approach:**

### Watch

Pros:

* More explicit control over when and how the `count` is incremented.
* Can be used for more complex logic that depends on multiple properties.

Cons:

* May lead to unnecessary re-renders or unnecessary updates if not properly synchronized.

### Updated

Pros:

* Automatic re-renders are triggered only when necessary, reducing unnecessary work.
* Easier to manage more complex logic by relying on the framework's built-in update mechanism.

Cons:

* Loss of explicit control over updating certain properties.

**Library used:**

In this test case, we're using the Vue.js library, which provides the `watch` and `updated` functions. The Vue.js framework is responsible for managing the component's state and re-renders the template when necessary.

**Special JS feature or syntax:**

The test uses a JavaScript feature known as "template literals" (`<div>{{ value }} {{ count }}</div>`). This allows us to embed expressions directly into HTML templates. Additionally, we're using arrow functions (e.g., `value: () => ({ ... })`) and ES6 classes (`new Vue({ ... })`), which are part of the ECMAScript standard.

**Alternatives:**

If you want to create similar benchmarks or test other JavaScript features, here are some alternatives:

* MeasureThat.net has a vast collection of pre-built benchmark templates for various technologies.
* You can use other online tools like JSPerf, Benchmark.js, or Webpack's built-in benchmarking tool.
* For more advanced testing and performance analysis, consider using Node.js's built-in `perf` module or third-party libraries like Istanbul.

In summary, this test compares the performance of two approaches for updating a counter in a Vue.js component: manual updates via the `watch` function versus automatic updates via the `updated` hook. By understanding the pros and cons of each approach, you can make informed decisions about when to use these techniques in your own codebases.

Related benchmarks:

vue updated vs watch (version: 0)

Comparing performance of: watch vs updated

Created: 4 years ago by: Registered User

Jump to the latest result

watch

updated

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):