Benchmark: map includes vs some

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var array = [{ foo: 'banana' }, { foo: 'sausage' }, { foo: 'jesus' }]

Tests:

map includes
array.map(x => x.foo).includes('sausage')
some
array.some(v => v.foo === 'sausage')

Historical Performance Data aggregated from 8 community runs

Desktop Results:

Chrome 8 runs

some

27.3M/s

map includes

20.5M/s

Fastest: some (1.3x faster)

View exact numbers

✓ some: 27,269,508 ops/sec
• map includes: 20,503,004 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
map includes
some

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Mac OS X 10.15.7

View result in a separate tab

some

101.1M/s

map includes

53.0M/s

View exact numbers

Test name	Executions per second
✓ some	101,064,960 Ops/sec
map includes	52,991,508 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmark and its results.

**Benchmark Purpose**

The benchmark measures the performance difference between two ways of finding if an array contains a value: using `array.map()` with the `.includes()` method, and using the `some()` method directly. The test case creates an array with three objects and uses these methods to search for the presence of the string `'sausage'` in it.

**Options Compared**

There are two main options being compared:

1. **map includes**: This approach uses `array.map()` to create a new array with the same elements, and then checks if the resulting array contains the target value using `.includes()`.
2. **some**: This approach uses the `some()` method directly on the original array to check if any element matches the condition.

**Pros and Cons**

* **map includes**:
	+ Pros: Can be more intuitive for developers who are familiar with `map()` and want to ensure that all elements match.
	+ Cons: Creates a new array, which can lead to increased memory usage and slower performance for large datasets.
	+ Additional overhead: The creation of the new array using `map()` adds extra work for the engine.
* **some**:
	+ Pros: More efficient in terms of memory usage, as only one iteration is required through the elements.
	+ Cons: Requires a good understanding of how `some()` works and can be less intuitive for developers who are not familiar with it.

**Library Usage**

The benchmark uses the `lodash` library, which provides the `.includes()` method. The HTML preparation code includes a script tag that loads the `lodash.min.js` file from a CDN.

**Special JS Features/Syntax**

There is no special JavaScript feature or syntax used in this benchmark.

**Other Alternatives**

For comparison, other methods to check if an array contains a value could include:

* Using `Array.prototype.indexOf()` or `Array.prototype.includes()`
* Using a for loop with `if` statements
* Using the `every()` method (which is the opposite of `some()`)

These alternatives would likely produce different results and may have their own trade-offs in terms of performance, memory usage, and readability.

map includes vs some (version: 0)

performance comparison of ways to find if an array contains a value

Comparing performance of: `map includes vs some`

Created: 4 years ago by: Guest

Go to the latest result

map includes

some

Historical Performance Data aggregated from 8 community runs

Desktop Results:

Chrome 8 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

map includes vs some (version: 0)

performance comparison of ways to find if an array contains a value

Comparing performance of: map includes vs some

Created: 4 years ago by: Guest

Go to the latest result

map includes

some

Historical Performance Data aggregated from 8 community runs

Desktop Results:

Chrome 8 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

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Comparing performance of: `map includes vs some`