Benchmark: findIndex vs loop

Script Preparation code:

var itemValue = "50";
var queryValue = Array.from(Array(100).keys());

Tests:

looping
let found = false; for (let i = 0; i < queryValue.length; i++) { if (itemValue?.toString().includes(queryValue[i]?.toString() ?? "")) { found = true; break; // short circuit } } if (found === false) { return false; }
findIndex
if ( queryValue.findIndex((v) => itemValue?.toString().includes(v?.toString() ?? "") ) === -1 ) { return false; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
looping
findIndex

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**Benchmark Overview**

The benchmark is designed to compare two approaches for searching for a substring in an array: using a traditional loop and utilizing the `findIndex` method.

**Options Being Compared**

1. **Looping**: This approach uses a traditional `for` loop to iterate through the array, checking each element to see if it contains the target substring.
2. **FindIndex**: This approach utilizes the `findIndex` method of the Array prototype, which returns the index of the first element that satisfies the provided callback function.

**Pros and Cons**

**Looping**

Pros:

* Generally more control over the iteration process
* Can be optimized for specific use cases (e.g., using early exit conditions)

Cons:

* Typically slower than `findIndex` due to the overhead of manual loop management

**FindIndex**

Pros:

* Faster and more concise, making it a popular choice for searching arrays
* Reduces the chance of off-by-one errors or incorrect indexing

Cons:

* May be less intuitive or more error-prone for developers unfamiliar with the method
* Can be slower in certain scenarios (e.g., when dealing with large arrays)

**Library and Special JS Features**

The `findIndex` method is a part of the JavaScript language standard, specifically introduced in ECMAScript 2015 (ES6). It's not considered a library per se, but rather an integral feature of the language.

No special JS features or syntax are used in this benchmark beyond what's already discussed.

**Other Alternatives**

While `findIndex` is often preferred for its conciseness and speed, there are alternative methods you might consider depending on your specific use case:

* **Array.prototype.indexOf()**: Similar to `findIndex`, but with a slightly different signature (returns -1 if not found).
* **Array.prototype.lastIndexOf()**: Returns the index of the last occurrence of the specified value.
* **forEach()` and **filter()` methods: Can be used in combination to achieve similar results, although they might incur additional overhead.

In summary, this benchmark is designed to highlight the performance differences between a traditional loop and the `findIndex` method for searching arrays. While `findIndex` is generally faster and more concise, understanding both approaches can help developers make informed decisions about their code's execution speed and maintainability.

Related benchmarks:

findIndex vs loop (version: 0)

searching for substring using loop vs findIndex

Comparing performance of: looping vs findIndex

Created: 3 years ago by: Guest

Jump to the latest result

looping

findIndex

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):