Benchmark: my own array: indexOf vs includes vs some

Script Preparation code:

var array = ['banana', 'sausage', 'jesus']

Tests:

IndexOf
array.indexOf('sausage')
Includes
array.includes('sausage')
some
array.some(v => v === 'sausage')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
IndexOf
Includes
some

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and some pros/cons of each approach.

**Benchmark Overview**

The benchmark is comparing three different methods to check if an array contains a specific value: `indexOf()`, `includes()`, and `some()`.

**Library: None**

There are no external libraries used in this benchmark. The array is created using JavaScript's built-in syntax.

**Special JS Feature/Syntax: Some**

The `some()` method uses the "ternary operator" or "conditional expression" feature of JavaScript, which allows you to write a concise way to perform conditional checks. This feature is commonly used for short-circuit evaluations and can be an efficient way to stop evaluating expressions as soon as a condition is met.

**Comparison**

The three methods being compared are:

1. `indexOf()`: This method returns the index of the first occurrence of the specified value in the array. If the value is not found, it returns -1.
2. `includes()`: This method returns a boolean value indicating whether the array includes the specified value or not.
3. `some()` : This method returns a boolean value indicating whether at least one element in the array satisfies the provided condition.

**Pros and Cons of Each Approach**

* `indexOf()`:
	+ Pros: Fast and efficient, especially for arrays with unique values.
	+ Cons: Returns the index of the first occurrence, which might not be what you want if there are multiple occurrences. If the value is not found, it returns -1, which can be a useful return value, but may also indicate an absence rather than a specific negative result.
* `includes()`: 
	+ Pros: Easy to read and understand, straightforward implementation, and efficient for most cases.
	+ Cons: May not be as fast as `indexOf()` for large arrays with unique values. It's also worth noting that `includes()` was introduced in ECMAScript 2019 and might require polyfills for older browsers.
* `some()`: 
	+ Pros: Can stop evaluating expressions immediately if the condition is met, making it efficient for large arrays or when searching for a specific value within an array of many possibilities.
	+ Cons: Requires using a function with a callback, which can make the code more difficult to read and understand. It also returns a boolean value, not the index or position.

**Benchmark Result**

The latest benchmark results show that:

* `some()` is the fastest execution method among the three, executing 125 million times per second.
* `includes()` comes in second, with around 43 million executions per second.
* `indexOf()` takes the longest time to execute, around 38.7 million executions per second.

Keep in mind that these results are browser-specific and may vary depending on other factors like system resources, CPU architecture, and software configuration.

**Other Alternatives**

There are other methods to check if an array contains a specific value, such as:

* `filter()`: Returns an array of elements for which the provided function returns true.
* `forEach()`: Executes the provided callback for each element in the array.
* Regular expressions (`/regex/`): Can be used to search for patterns within arrays.

However, these methods may not provide the same level of performance as `indexOf()` or `includes()` for simple checks. The choice of method depends on the specific use case and requirements.

Latest run results:

Run details: (Test run date: 11 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:120.0) Gecko/20100101 Firefox/120.0

Browser/OS: Firefox 120 on Windows

View result in a separate tab

Test name	Executions per second
IndexOf	38673060.0 Ops/sec
Includes	43196700.0 Ops/sec
some	125027700.0 Ops/sec

Related benchmarks:

my own array: indexOf vs includes vs some (version: 0)

performance comparison of ways to find if an array contains a value

Comparing performance of: IndexOf vs Includes vs some

Created: 11 months ago by: Guest

Jump to the latest result

IndexOf

Includes

some

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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