Benchmark: find - filter js

HTML Preparation code:

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.29/angular.min.js"></script>

Script Preparation code:

var angularFilter = angular.injector(['ng']).get('$filter')('filter');

// Add array.where implementation
Array.prototype.where = Array.prototype.where || function(predicate) {
  var results = [],
    len = this.length,
    i = 0;

  for (; i < len; i++) {
    var item = this[i];
    if (predicate(item)) {
      results.push(item);
    }
  }

  return results;
};

// Generate test array
window.array = (function() {
  var arr = [];
  for (var i = 0; i < 100; ++i) {
    arr.push(i);
  }

  return arr;
}());

grepAlone = function( elems, callback, invert ) {
		var callbackInverse,
			matches = [],
			i = 0,
			length = elems.length,
			callbackExpect = !invert;

		// Go through the array, only saving the items
		// that pass the validator function
		for ( ; i < length; i++ ) {
			callbackInverse = !callback( elems[ i ], i );
			if ( callbackInverse !== callbackExpect ) {
				matches.push( elems[ i ] );
			}
		}

		return matches;
};

Array.prototype.find = function(predicate) {
  if (this == null) {
    throw new TypeError('Array.prototype.find called on null or undefined');
  }
  if (typeof predicate !== 'function') {
    throw new TypeError('predicate must be a function');
  }
  var list = Object(this);
  var length = list.length >>> 0;
  var thisArg = arguments[1];
  var value;

  for (var i = 0; i < length; i++) {
    value = list[i];
    if (predicate.call(thisArg, value, i, list)) {
      return value;
    }
  }
  return undefined;
};

function getValue(el) {
	return el - 50 > 31;
}

Tests:

array.find
array.find(getValue);
array.filter
array.filter(getValue);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array.find
array.filter

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 24 days ago):

LLMs can make mistakes. Check important info.

I'll do my best to break down the benchmark and explain what's being tested, compared options, pros and cons of each approach, library usage, special JS features or syntax, and other considerations.

**Benchmark Overview**

The provided benchmark measures the performance of two array operations: `find` and `filter`. The benchmark uses AngularJS, a JavaScript framework that provides a set of libraries and services for building web applications.

**Script Preparation Code**

The script preparation code sets up an AngularJS injector to retrieve the `$filter` service, which is used to define custom filter functions. It then defines two custom filter functions: `angularFilter` and `getValue`. The `angularFilter` function is a simple wrapper around the `$filter` service, while the `getValue` function takes an element as input and returns a boolean value indicating whether the element's value minus 50 is greater than 31.

**Html Preparation Code**

The HTML preparation code includes a reference to the AngularJS library (version 1.2.29) via a CDN link. This library provides the `$filter` service used in the script preparation code.

**Individual Test Cases**

There are two test cases:

1. `array.find(getValue)`
2. `array.filter(getValue)`

Both tests use the same custom filter function, `getValue`, but apply it to different array operations: `find` and `filter`.

**What's Being Tested?**

The benchmark measures the performance of these two array operations on an array of 100 elements, where each element is a number. The test case for `array.find(getValue)` attempts to find the first element that matches the condition defined by the `getValue` function, while the test case for `array.filter(getValue)` filters out all elements that do not match the condition.

**Comparison Options**

There are two comparison options:

1. **Array.prototype.find**: This method returns the first element in an array that satisfies a provided testing function.
2. **Array.prototype.filter**: This method constructs a new array with all elements that satisfy the provided testing function.

**Pros and Cons of Each Approach**

**Array.prototype.find:**

Pros:

* More efficient for finding a single matching element
* Can be used to find the first or last matching element

Cons:

* May not work as expected if the array is empty or null
* Can throw an error if the testing function is not provided

**Array.prototype.filter:**

Pros:

* Returns a new array with all matching elements, which can be useful for data processing
* Does not modify the original array

Cons:

* Returns an empty array if no elements match the condition
* May be less efficient than `find` for finding a single matching element

**Library Usage (AngularJS)**

The AngularJS library is used to provide a simple way to define custom filter functions, such as `angularFilter`. The `$filter` service is used to create a wrapper around the custom filter function.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntaxes being tested in this benchmark. The focus is on the performance of array operations.

**Other Considerations**

* The test cases use a fixed-size array with 100 elements, which may not be representative of real-world scenarios.
* The custom filter function `getValue` is simple and linear, which may affect the results.
* The benchmark only measures performance on Chrome 95 and Windows desktop platforms. Results may vary for other browsers or platforms.

**Alternatives**

There are alternative approaches to implementing these array operations:

1. **Using the `indexOf()` method**: This can be used to find the index of the first matching element in an array.
2. **Using a regular expression**: This can be used to filter an array based on a regular expression pattern.
3. **Using a custom implementation without libraries**: This can be done using basic JavaScript operations, such as looping through the array and checking each element.

These alternatives may have different performance characteristics compared to the methods tested in this benchmark.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36

Browser/OS: Chrome 95 on Windows

View result in a separate tab

Test name	Executions per second
array.find	225731.6 Ops/sec
array.filter	232807.1 Ops/sec

Related benchmarks:

find - filter js (version: 0)

Comparing performance of: array.find vs array.filter

Created: 3 years ago by: Guest

Jump to the latest result

array.find

array.filter

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 24 days ago):