Benchmark: Finding in array of object

Script Preparation code:

var arr = [];
var i = 0;

for (let i = 0; i <= 1E5; i++) arr[i] = {i: i};

Tests:

1
const item = arr.find(item => item == 1E5);
2
const index = arr.map(i => i).indexOf(1E5);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2

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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Let's dive into the world of MeasureThat.net and explore what's being tested in this specific benchmark.

**Benchmark Definition**

The benchmark is designed to measure the performance of JavaScript microbenchmarks, specifically focusing on finding an item in an array of objects.

The script preparation code creates an empty array `arr` with a fixed size of 100,000 elements, each containing a single property `i` initialized to the current index. This setup allows for a large dataset that's easy to work with when testing lookup operations.

**Options Compared**

There are two test cases being compared:

1. **Finding an item in the array using the `find()` method**: The benchmark defines a constant `item` and uses the `find()` method to search for an element with a specific value (`i == 1E5`). This approach is commonly used when you need to find a specific item based on a condition.
2. **Finding an index in the array using the `indexOf()` method**: The benchmark defines a constant `index` and uses the `indexOf()` method to search for a specific element with a value (`i == 1E5`). This approach is commonly used when you need to find the position of an element within the array.

**Pros and Cons**

Here are some pros and cons of each approach:

**Find() Method**

Pros:

* Efficient use of memory, as it only searches one element at a time
* Can be faster for small datasets

Cons:

* May not perform well for large datasets or when dealing with sparse arrays
* May have issues with edge cases (e.g., if the array is empty)

**IndexOf() Method**

Pros:

* Guaranteed to find the first occurrence of the element, even in a large dataset
* Can handle sparse arrays and edge cases

Cons:

* Requires iterating over the entire array, which can be memory-intensive for large datasets
* May not perform well for small datasets or when dealing with sparse arrays

**Other Considerations**

When choosing between `find()` and `indexOf()`, consider the following factors:

* Dataset size: For smaller datasets, `find()` might be faster. For larger datasets, `indexOf()` might be more suitable.
* Edge cases: If you need to handle edge cases (e.g., empty array), `indexOf()` is a safer choice.
* Performance: MeasureBoth will provide data on performance differences between these approaches.

**Library and Special JS Features**

There are no libraries mentioned in this benchmark. However, some JavaScript features like arrow functions (`=>`) are used in the script preparation code and individual test cases. These features are widely supported by modern browsers and should work without issues.

**Alternatives**

MeasureThat.net provides an extensive range of benchmarking options for JavaScript microbenchmarks. If you're interested in exploring other alternatives, consider:

* JSPerf: A popular benchmarking tool that allows you to create and share your own benchmarks.
* Benchmark.js: A lightweight, high-performance benchmarking library that supports multiple platforms and browsers.

These tools offer a range of features, including support for various JavaScript features, library integrations, and more.

Related benchmarks:

Finding in array of object (version: 0)

Comparing performance of: 1 vs 2

Created: 2 years ago by: Guest

Jump to the latest result

1

2

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):