Benchmark: Multiple match calls vs multiple selector

HTML Preparation code:

<div class="first"></div>
<div class="second"></div>

Tests:

Multiple match calls
const firstEl = document.querySelector(".first"); const secondEl = document.querySelector(".second"); const array = []; for (let step = 0; step < 5000; step++) { if (firstEl.matches(".first") || firstEl.matches(".second")) { array.push(firstEl); } } for (let step = 0; step < 5000; step++) { if (secondEl.matches(".first") || secondEl.matches(".second")) { array.push(secondEl); } }
Multiple selectors
const firstEl = document.querySelector(".first"); const secondEl = document.querySelector(".second"); const array = []; for (let step = 0; step < 5000; step++) { if (firstEl.matches(".first, .second")) { array.push(firstEl); } } for (let step = 0; step < 5000; step++) { if (firstEl.matches(".first, .second")) { array.push(secondEl); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Multiple match calls
Multiple selectors

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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**Benchmark Overview**

The benchmark tests two different approaches for selecting elements with multiple classes using `document.querySelector()` and `.matches()`. The test cases are designed to measure the performance difference between these two methods.

**Options Compared**

Two options are compared:

1. **Multiple match calls**: This approach involves calling `.matches()` multiple times for each element, once for each class name.
2. **Multiple selectors**: This approach involves specifying multiple classes in a single call to `document.querySelector()`, using the comma-separated syntax (`".first, .second"`).

**Pros and Cons**

**Multiple Match Calls:**

Pros:

* Easy to understand and implement
* Works well with existing code that uses `.matches()` for single-class selection

Cons:

* Results in multiple function calls, which can lead to increased overhead due to the function call overhead
* May lead to slower performance compared to other approaches

**Multiple Selectors:**

Pros:

* Reduces the number of function calls required, leading to faster performance
* Can be more efficient than multiple match calls

Cons:

* Requires the use of a comma-separated syntax for class names
* May require changes to existing code that uses `.matches()` for single-class selection

**Library and Purpose (None)**

This benchmark does not use any external libraries.

**Special JavaScript Feature or Syntax**

`.matches()` is used in this benchmark, which allows elements to be selected based on their classes. This feature was introduced in ECMAScript 2017 (ES7).

**Other Alternatives**

If the `document.querySelector()` method is not available or not desired, other alternatives for selecting elements with multiple classes include:

1. **Using a CSS selector**: You can use a CSS selector to select elements based on their class names.
2. **Implementing your own matching function**: If you need more control over the selection process, you can implement your own function that checks for multiple class matches.

Keep in mind that these alternatives may have different performance characteristics and requirements compared to the `document.querySelector()` method used in this benchmark.

Related benchmarks:

Multiple match calls vs multiple selector (version: 0)

Comparing performance of: Multiple match calls vs Multiple selectors

Created: 4 years ago by: Guest

Jump to the latest result

Multiple match calls

Multiple selectors

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):