Benchmark: Some vs. Filter vs. indexOf (object)

Script Preparation code:

var hasZero = [];
var withoutZero = [];
for (var i = 0; i < 10000; i++) {
  hasZero.push({x:Math.floor(Math.random() * 1000)});
  withoutZero.push({x:(Math.floor(Math.random() * 1000) + 1)})
}

Tests:

Array.some
var tempResult = !!Math.round(Math.random()) ? hasZero.some(v => v.x === 0) : withoutZero.some(v => v.x === 0);
Array.filter
var tempResult = !!Math.round(Math.random()) ? hasZero.filter(v => v.x === 0) : withoutZero.filter(v => v.x === 0);
Array.indexOf
var tempResult = !!Math.round(Math.random()) ? hasZero.indexOf(v => v.x === 0) > -1 : withoutZero.indexOf(v => v.x === 0) > -1;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.some
Array.filter
Array.indexOf

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 the provided benchmark JSON and explain what's being tested.

**Benchmark Definition**

The benchmark is comparing three approaches for filtering an array of objects:

1. `some()`: Returns `true` if at least one element in the array passes the test.
2. `filter()`: Creates a new array with all elements that pass the test.
3. `indexOf()`: Returns the index of the first element that passes the test, or -1 if no such element exists.

**Options Compared**

The benchmark is comparing these three approaches:

* `some()`
* `filter()`
* `indexOf()`

**Pros and Cons of Each Approach:**

1. **Array.some()**:
	* Pros: Simple to use, efficient in terms of memory usage (only creates a new iterator object).
	* Cons: Returns `true` or `false`, not the actual filtered array.
2. **Array.filter()**:
	* Pros: Returns the filtered array, useful for further processing.
	* Cons: More memory-intensive than `some()` since it creates a new array with the filtered elements.
3. **Array.indexOf()**:
	* Pros: Can be faster in some cases since it only searches for the first occurrence of the element.
	* Cons: Returns -1 if no such element exists, which can lead to unnecessary checks.

**Other Considerations**

* The benchmark generates two arrays with 10,000 elements each, using random values for simplicity.
* The test uses the `!!Math.round(Math.random())` trick to ensure that the test is deterministic and not affected by floating-point precision issues.

**Library Used: None**

There are no external libraries used in this benchmark. All three approaches are native JavaScript methods.

**Special JS Feature or Syntax: None**

This benchmark does not use any special JavaScript features or syntax, making it accessible to a wide range of software engineers with varying levels of knowledge.

**Alternatives:**

If you wanted to test alternative approaches for filtering arrays, some examples could be:

* Using `Array.prototype.map()` and then filtering the resulting array
* Using `Array.prototype.reduce()` and accumulating the filtered elements in an accumulator array
* Using a third-party library like Lodash or Ramda for filtering

Keep in mind that these alternatives might change the performance characteristics of the benchmark.

Related benchmarks:

Some vs. Filter vs. indexOf (object) (version: 0)

Comparing performance of: Array.some vs Array.filter vs Array.indexOf

Created: 4 years ago by: Guest

Jump to the latest result

Array.some

Array.filter

Array.indexOf

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):