Benchmark: Array.find vs Array.find (boolean) vs Array.some

Script Preparation code:

window.source = Array.from(Array(1000).keys());
window.target = Math.random() * source.length;

Tests:

Array.find
const result = source.find(lookup => target === lookup);
Array.find (as boolean)
const result = !!source.find(lookup => target === lookup);
Array.some
const result = source.some(lookup => target === lookup);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.find
Array.find (as boolean)
Array.some

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 break down what's being tested in this benchmark.

**What is being tested?**

The provided JSON represents a JavaScript microbenchmark that compares the performance of three different methods:

1. `Array.find()`
2. `Array.find()` with a boolean return type (i.e., converting the result to a boolean value)
3. `Array.some()`

These methods are used to find the first element in an array that satisfies a certain condition.

**Options being compared**

The three options being compared are:

* `Array.find()`: This method returns the first element in the array that satisfies the provided callback function.
* `Array.find()` with boolean return type: This is done by converting the result of `Array.find()` to a boolean value using the `!!` operator. If the result is truthy, it's considered true; otherwise, it's considered false.
* `Array.some()`: This method returns a boolean value indicating whether at least one element in the array satisfies the provided callback function.

**Pros and cons of each approach**

1. **Array.find():**
	* Pros: Returns the actual found element, which can be useful if you need to use it further.
	* Cons: May not return a value if no element is found, requiring additional checks.
2. **Array.find() with boolean return type:**
	* Pros: Simplifies the result to a single boolean value, making it easier to integrate into other code paths.
	* Cons: Discards any actual values returned by `Array.find()` and only uses them for the boolean conversion.
3. **Array.some():**
	* Pros: Returns a boolean value indicating whether at least one element is found, which can be useful in some scenarios.
	* Cons: Returns true as soon as it finds an element that satisfies the condition, but doesn't guarantee finding all matching elements.

**Library and purpose**

There are no libraries used in this benchmark. However, `Array.from()` is used to create a new array from an existing array of numbers (0-999).

**Special JS feature or syntax**

None mentioned.

The benchmark uses basic JavaScript features like callback functions, arrays, and boolean conversions.

**Other alternatives**

If you were to rewrite these methods yourself, here are some alternative approaches:

* Using `Array.prototype.some()` instead of `Array.prototype.find()`, which would also return a boolean value.
* Using a traditional loop with an index variable to iterate over the array elements, which would not be tested in this benchmark.

However, it's worth noting that the actual implementation of these methods is usually handled by the JavaScript engine (e.g., V8 for Chrome) and is optimized for performance. The benchmark is likely testing the behavior and performance of the engine rather than providing an alternative implementation.

Related benchmarks:

Array.find vs Array.find (boolean) vs Array.some (version: 0)

Comparing performance of: Array.find vs Array.find (as boolean) vs Array.some

Created: 5 years ago by: Guest

Jump to the latest result

Array.find

Array.find (as boolean)

Array.some

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):