Benchmark: Object arrays: find vs for loop

Script Preparation code:

var arr = new Array(15000);
arr.fill({ id: 0 });
arr = arr.map((el, idx) => el.id = idx);
var foo = Math.floor(Math.random() * 15000);

Tests:

find
arr.find((itm) => itm.id === foo);
for loop
for (let i = 0; i < arr.length; i++) { if (arr[i].id === foo) break; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
find
for loop

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 break down the benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is testing two approaches to find an object in an array:

1. **`arr.find((itm) => itm.id === foo)`**: This uses the `find()` method, which returns the first element in the array that satisfies the provided condition.
2. **`for (let i = 0; i < arr.length; i++) {\r\n  if (arr[i].id === foo) break;\r\n}`**: This uses a traditional `for` loop to iterate through the array and find the first element that matches the condition.

**Options being compared**

The two options being compared are:

* Using the `find()` method
* Using a traditional `for` loop

**Pros and Cons of each approach**

1. **`arr.find((itm) => itm.id === foo)`**
	* Pros:
		+ More concise and expressive code
		+ Can be more efficient for large arrays, as it stops iterating as soon as the condition is met
	* Cons:
		+ May have a higher overhead due to the function invocation and call stack management
		+ Not all browsers support `find()` (although most modern ones do)
2. **`for (let i = 0; i < arr.length; i++) {\r\n  if (arr[i].id === foo) break;\r\n}`**
	* Pros:
		+ Widely supported in all browsers
		+ Can be more intuitive for developers familiar with traditional loops
	* Cons:
		+ More verbose and less concise code
		+ May have a higher overhead due to the loop iteration

**Other considerations**

* **Array size**: The benchmark uses an array of 15,000 elements, which is a common choice for demonstrating performance differences between these two approaches.
* **Randomized search**: The `foo` variable is set to a random index in the array, making it more likely that the condition will be met quickly.

**Library or special JS feature**

Neither of the benchmark options explicitly uses any external libraries. However, the use of the `find()` method relies on the ECMAScript 5 standard, which introduced this functionality.

**Special JS feature (not applicable in this case)**

None of the benchmark options explicitly use any special JavaScript features like async/await, generators, or arrow functions (although the `map` function does).

**Other alternatives**

If you wanted to test these approaches using different methods, here are some alternatives:

* Use a `while` loop instead of a traditional `for` loop.
* Use `every()` and `some()` methods to find all matching elements instead of just the first one.
* Compare performance with other array methods like `forEach()`, `reduce()`, or `filter()`.
* Test with arrays of different sizes, shapes, or data types.

I hope this explanation helps you understand the benchmark and its underlying assumptions!

Related benchmarks:

Object arrays: find vs for loop (version: 0)

Testing finding an object array via find or by using a for loop

Comparing performance of: find vs for loop

Created: 3 years ago by: Guest

Jump to the latest result

find

for loop

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):