Benchmark: Not every 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;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.every
Array.indexOf

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks and explore what's being tested in this particular benchmark.

**Benchmark Overview**

The "Not every vs. indexOf" benchmark compares two approaches for checking if an element is not present in an array: `Array.every()` and `Array.indexOf()`. The goal is to determine which approach is faster, more efficient, or has better performance characteristics.

**Options Compared**

Two options are being compared:

1. **`Array.every()`**: This method returns a boolean value indicating whether every element in the array passes the provided test.
2. **`Array.indexOf()`**: This method returns the index of the first occurrence of the specified value in the array, or -1 if it's not found.

**Pros and Cons**

* `Array.every()`: This approach is more explicit about checking for the presence of an element, but it may have performance implications due to its iterative nature.
* `Array.indexOf()`**: This approach is more concise and directly checks for the existence of an element, making it potentially faster. However, it only checks for the first occurrence, whereas `every()` checks all elements.

**Library and Purpose**

In this benchmark, no specific JavaScript library is being used beyond the built-in `Array` methods. However, the use of ES6+ features like arrow functions (`=>`) and template literals (`\r\narr.push('A');`) suggests a modern JavaScript environment.

**Special JS Features or Syntax**

The benchmark uses several advanced JavaScript features:

* **Arrow functions**: Used in the lambda expression within `every()`.
* **Template literals**: Used to create string literals with newline characters.
* **ES6+ methods**: Used in both comparison methods (`every()` and `indexOf()`).

These features are likely used to make the code more concise and readable, but may not be familiar to all developers.

**Other Alternatives**

If you're interested in exploring alternative approaches for checking array element presence, consider:

1. **Using a custom function**: Instead of relying on built-in methods, you could write your own custom function to check for an element's existence.
2. **Utilizing bitwise operations**: Certain bitwise operations, like using `&` and `^`, can be used to quickly determine if an element is not present in an array.

However, keep in mind that these alternatives might come with additional overhead or complexity compared to using built-in methods like `Array.every()` and `Array.indexOf()`.

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Linux; Android 10; GM1913) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.79 Mobile Safari/537.36

Browser/OS: Chrome Mobile 79 on Android

View result in a separate tab

Test name	Executions per second
Array.every	8450425.0 Ops/sec
Array.indexOf	8327307.5 Ops/sec

Related benchmarks:

Not every vs. indexOf (version: 0)

Comparing performance of: Array.every vs Array.indexOf

Created: 4 years ago by: Guest

Jump to the latest result

Array.every

Array.indexOf

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):