Benchmark: Finding an object in an array

Script Preparation code:

var toSearch = [{
    id: "1"
}, {
    id: "2"
}, {
    id: "3"
}, {
    id: "4"
}, {
    id: "5"
}, {
    id: "6"
}, {
    id: "7"
}, {
    id: "8"
}, {
    id: "9"
}, {
    id: "10"
}, {
    id: "11"
}, {
    id: "12"
}, {
    id: "13"
}, {
    id: "14"
}, {
    id: "15"
}]

Tests:

Native find
toSearch.find(function (o) { return o.id === "15"; })
for loop
for (var i=0; i<toSearch.length; i++) { if (toSearch[i].id === "15") { break; } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Native 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 provided JSON data and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark measures how fast JavaScript can find an object in an array using two approaches: native `find()` method and a traditional `for` loop.

**Options Compared**

1. **Native find**: The first option uses the built-in `find()` method of the Array prototype in JavaScript. This method returns the first element that satisfies the provided condition (in this case, `o.id === "15"`).
2. **For loop**: The second option uses a traditional `for` loop to iterate over the array and find the desired object.

**Pros and Cons**

1. **Native find**
	* Pros:
		+ Efficient and optimized by the JavaScript engine.
		+ Reduces overhead compared to manual iteration.
	* Cons:
		+ May not work in older browsers or environments that don't support `find()`.
		+ Less control over the iteration process.
2. **For loop**
	* Pros:
		+ Provides more control over the iteration process and can be optimized for specific use cases.
		+ Works in all browsers and environments that support JavaScript.
	* Cons:
		+ More overhead due to manual iteration, which can impact performance.

**Library Used**

In this benchmark, no external libraries are used. The `find()` method is a built-in Array prototype function in JavaScript.

**Special JS Features/Syntax**

There's no special JavaScript feature or syntax being tested in this benchmark. However, it's worth noting that the use of the `for` loop relies on JavaScript's loop syntax, which is widely supported but not unique to modern browsers.

**Other Alternatives**

If you were to implement a different approach for finding an object in an array, some alternatives could include:

1. **Using `forEach()` and callback**: Instead of using `find()`, you could use the `forEach()` method with a callback function that returns a boolean value indicating whether the current element matches the condition.
2. **Using `filter()`**: Another approach would be to use the `filter()` method, which creates a new array with elements that pass the test provided by the filtering function.
3. **Manual iteration using `indexOf()` and conditional statements**: You could manually iterate over the array using `indexOf()`, checking for each element if it matches the condition, and stopping when found.

These alternatives might offer different trade-offs in terms of performance, control, and readability, depending on your specific use case.

Related benchmarks:

Finding an object in an array (version: 0)

Comparing performance of: Native find vs for loop

Created: 5 years ago by: Guest

Jump to the latest result

Native 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):