Benchmark: array find vs object key

Script Preparation code:

var obj = (new Array(1000)).fill(null).reduce((prev, newVal) => {prev[Math.random() + ''] = Math.random() + ''; return prev; }, { sausage: 'tst' });
var array = Object.keys(obj);

Tests:

find
array.find((item) => item === 'sausage')
Object[key]
obj['sausage']

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
find
Object[key]

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; rv:135.0) Gecko/20100101 Firefox/135.0

Browser/OS: Firefox 135 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
find	1050238528.0 Ops/sec
Object[key]	1577858304.0 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 JavaScript microbenchmark on MeasureThat.net.

**Benchmark Overview**

The benchmark compares the performance of two approaches: using the `array.find()` method and accessing an object key directly (i.e., `obj['sausage']`).

**Approaches Compared**

1. **Array Find**: The `array.find()` method is used to search for a specific element in an array. In this case, it's searching for an element that matches the string `'sausage'`.
2. **Object Key Access**: Directly accessing an object key using the syntax `obj['sausage']`.

**Pros and Cons**

* **Array Find**:
	+ Pros: Efficient use of JavaScript engines to optimize search.
	+ Cons: May incur overhead due to method invocation, function calls, and potentially creating a new array iteration.
* **Object Key Access**:
	+ Pros: Fast access to object properties using the `obj['sausage']` syntax.
	+ Cons: May not be optimized for performance by JavaScript engines, as it's a more straightforward but less efficient operation.

**Library Used**

None mentioned in this specific benchmark. However, it's worth noting that libraries like Lodash (which provides `find()` functionality) might affect the results.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax used in this benchmark.

**Other Alternatives**

For searching arrays, other approaches could be:

1. `indexOf()`: A method that returns the index of the first occurrence of a specified value.
2. For loops: Iterating over the array elements using a traditional for loop.
3. Other array methods like `some()` or `every()`.

For accessing object properties, alternative syntaxes might include:

1. Bracket notation with dot separation (e.g., `obj['sausage'].prop`).
2. Using a property access function (e.g., `getProp(obj, 'sausage')`).

Keep in mind that these alternatives may not be optimized for performance by JavaScript engines and should be considered when choosing the best approach for your specific use case.

**Benchmark Results**

The latest benchmark results show that:

* The `array.find()` method is faster (executions per second: 16504123.0) compared to accessing an object key directly (executions per second: 15637711.0).

These results suggest that the `array.find()` method is optimized for performance in this specific use case. However, it's essential to consider other factors, such as readability and maintainability, when choosing between these approaches in your own code.

Related benchmarks:

array find vs object key (version: 0)

Comparing performance of: find vs Object[key]

Created: one year ago by: Guest

Jump to the latest result

find

Object[key]

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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