Benchmark: Find vs some perf

Script Preparation code:

var arr = [];
for (let i = 0; i < 10000; i++) {
    arr.push({
        id: Math.round(Math.random() * 9999)
    });
}

var targets = [arr[68], arr[972], arr[8722]];

Tests:

find
var promise = function(){ arr.find((i)=>{ return i == t["id"]; }) } for(let t of targets){ promise().then( (r) =>{ r["ignored"] = true; }); } console.log(arr);
some
var pos; for(let t of targets){ arr.some((i)=>{ return i == t["id"]; }) } console.log(arr);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
find
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):

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Let's break down the provided JSON data and explain what's being tested.

**Benchmark Definition**

The benchmark is defined by two test cases: `find` and `some`. The script preparation code generates an array of 10,000 objects with random IDs. The `targets` variable contains a subset of these objects with specific IDs (68, 972, and 8722).

**Options being compared**

In the `find` and `some` test cases:

*   The search value is set to `$t["id"]`, which represents a JavaScript variable that's not defined in the script preparation code. This suggests that the benchmark is testing the performance of the browser's garbage collection or some other mechanism for handling uninitialized variables.
*   Both `find` and `some` iterate over the `targets` array, but `some` uses an early return condition (`return true;`), whereas `find` uses a single pass through the entire array.

**Pros and Cons**

*   **Early return in `some`:**
    *   Pros: Reduces number of iterations if the target is found.
    *   Cons: May result in lower performance due to unnecessary early exits, as it assumes that at least one element matches.
*   **Single pass through array in `find`:**
    *   Pros: More comprehensive iteration, which may be more representative of real-world scenarios where all elements might need to be checked.
    *   Cons: Requires a full traversal of the array, potentially leading to higher performance overhead.

**Library and Purpose**

The `arr` and `targets` variables are arrays in JavaScript. The purpose of these arrays is to serve as test data for the benchmark.

**Special JS feature or syntax**

There's no explicit mention of special JavaScript features or syntax in the provided code. However, it's worth noting that using `$t["id"]` instead of a properly defined variable might be intended to simulate an uninitialized variable or some other edge case.

**Other alternatives**

The `some` method is often used when there's no guarantee that at least one element will match the condition. It returns as soon as it finds a matching element, which can improve performance in cases where most elements won't match. In contrast, the `find` method returns as soon as it finds the first matching element.

In terms of alternatives for the benchmark, other methods like using `filter()` instead of `some()` or `forEach()` could be considered, depending on the desired behavior and performance characteristics.

Related benchmarks:

Find vs some perf (version: 0)

Comparing performance of: find vs some

Created: 4 years ago by: Guest

Jump to the latest result

find

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):