Benchmark: every not vs. not some vs. indexOf

Script Preparation code:

var arr = [];
arr.push('A');
arr.push('B');
arr.push('C');
arr.push('D');

Tests:

Array.every
var tempResult = arr.every(v => v !== 'D');
Array.indexOf
var tempResult = arr.indexOf('D') < 0;
!Array.some
var tempResult = !arr.some(v => v === 'D');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.every
Array.indexOf
!Array.some

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided benchmark measures the performance of three different approaches for checking if a value exists in an array:

1. `every()`: Checks if all elements in the array pass the test.
2. `indexOf()`: Returns the index of the first occurrence of the specified value, or -1 if not found.
3. `some()`: Checks if at least one element in the array passes the test.

**Options Compared**

The benchmark compares the performance of these three approaches on an array with four elements: 'A', 'B', 'C', and 'D'. The order of the values is important, as it affects the number of iterations and comparisons required by each method.

* `every()` will iterate through the entire array, comparing each element to the value being tested. If any element passes the test, the method returns true.
* `indexOf()` will search for the specified value in the array. This can be faster than `every()` if the value is found early in the array, but may slow down if the value is not found (in which case it returns -1).
* `some()`, on the other hand, stops iterating as soon as it finds a match. However, its performance may degrade if the value being tested is actually present at the end of the array.

**Pros and Cons**

* `every()`:
	+ Pros: Simple to understand and implement.
	+ Cons: May be slower than other approaches due to unnecessary comparisons.
* `indexOf()`:
	+ Pros: Can be faster than `every()` if the value is found early in the array.
	+ Cons: May slow down if the value is not found, as it returns -1. Also, may require additional checks to handle cases where the index is out of bounds.
* `some()`:
	+ Pros: Stops iterating when a match is found, making it more efficient than `every()` for large arrays.
	+ Cons: May degrade performance if the value being tested is actually present at the end of the array.

**Library and Syntax**

The benchmark uses the built-in JavaScript array methods: `every()`, `indexOf()`, and `some()`. These methods are part of the ECMAScript standard, so they are supported by most modern browsers.

There are no libraries or special JavaScript features used in this benchmark beyond what is inherent to the language itself.

**Other Considerations**

When choosing between these approaches, consider the specific requirements of your use case. For example:

* If you need to ensure that all elements pass a test, `every()` may be the best choice.
* If you only care about finding the first occurrence of a value, `indexOf()` might be sufficient.
* If you're dealing with large arrays and want to stop iterating as soon as possible, `some()` could be a good option.

**Alternatives**

If you're looking for alternative approaches or libraries that can improve performance in similar scenarios:

* For large arrays, consider using more efficient algorithms like binary search (not applicable to array methods).
* For more control over the iteration process, consider using `forEach()` or `map()`.
* For specific use cases, consider using specialized libraries like Lodash's `some()` and `every()` implementations.

Keep in mind that the choice of approach ultimately depends on your specific requirements and performance constraints.

Latest run results:

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

User agent: Mozilla/5.0 (Android 11; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0

Browser/OS: Firefox Mobile 91 on Android

View result in a separate tab

Test name	Executions per second
Array.every	52309136.0 Ops/sec
Array.indexOf	26695614.0 Ops/sec
!Array.some	51452272.0 Ops/sec

Related benchmarks:

every not vs. not some vs. indexOf (version: 0)

Comparing performance of: Array.every vs Array.indexOf vs !Array.some

Created: 4 years ago by: Guest

Jump to the latest result

Array.every

Array.indexOf

!Array.some

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):