Benchmark: indexOf vs match Dalpiaz

Script Preparation code:

var page = 'uk|en|bsd|ukbsdt1|stp|shop|productcategory|all-products|desktops-n-workstations';

Tests:

indexOf
if (page.indexOf('desktops') !== -1) { return true; }
match
if (page.match(/desktop/i)) { return true; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexOf
match

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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I'll break down the benchmark and explain what's being tested, compared, and other considerations.

**What is being tested?**

The provided benchmark measures the performance difference between two approaches to check if a specific string ("desktops") exists within another string (`page`).

There are two test cases:

1. `indexOf`: Uses the `indexOf()` method of the string object to search for the substring.
2. `match`: Uses a regular expression (regex) with the `match()` method to search for the substring.

**What options are compared?**

The two approaches being compared are:

* `indexOf()`: A simple, straightforward approach that searches for the exact substring within the string.
* `match()`: A regex-based approach that allows for partial matching and is often more flexible than `indexOf()`.

**Pros and Cons:**

1. `indexOf()`:
	* Pros:
		+ Simple and efficient.
		+ Fast execution time.
	* Cons:
		+ Only searches for the exact substring, which might not cover all use cases.
2. `match()`: (Note: The regex pattern `/desktop/i/` is used here)
	* Pros:
		+ Allows for partial matching, making it more flexible than `indexOf()`.
		+ Can be useful when searching for substrings that may have different lengths or formats.
	* Cons:
		+ May be slower due to the overhead of regex processing.

**Other considerations:**

* The benchmark uses a simple string (`page`) that is concatenated with other strings to create a longer page content. This might not accurately represent real-world scenarios, where `page` might be dynamically generated or have different contents.
* The test cases use the same browser (Chrome 75) and device platform (Desktop), which may not provide a comprehensive view of performance across different browsers and devices.

**Library and syntax:**

In this benchmark, no external libraries are used. However, it's worth noting that the `match()` method does rely on JavaScript's built-in regex engine.

**Special JS feature or syntax:**

There is no specific use of JavaScript features like ES6 classes, generators, or async/await in this benchmark.

**Other alternatives:**

If you want to explore alternative approaches for searching strings in JavaScript, consider the following:

* `includes()`: Introduced in ECMAScript 2015, this method provides a more efficient and readable way to check if a substring exists within a string.
* `String.prototype.includes()` (or `Array.prototype.includes()`): These methods use a similar approach to `indexOf()`, but are more efficient and flexible.

Keep in mind that the choice of method ultimately depends on your specific use case, performance requirements, and personal preference.

Related benchmarks:

indexOf vs match Dalpiaz (version: 0)

Comparing performance of: indexOf vs match

Created: 6 years ago by: Guest

Jump to the latest result

indexOf

match

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):