Benchmark: equality vs comparison

Script Preparation code:

var j=[1,2,3,4,5,6,7]
var t=5
var d=20

Tests:

comparison
j[0]<=d<=j[1] j[0]<=t<=j[1]
equality
j[0]==d && j[1]==d && j[2]==d && j[3]==d && j[4]==d && j[5]==d && j[6]==d j[0]==t && j[1]==t && j[2]==t && j[3]==t &&j [4]==t && j[5]==t && j[6]==t
in
d in j t in j
indexof
j.indexOf(d) j.indexOf(t)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
comparison
equality
in
indexof

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.0 Mobile/15E148 Safari/604.1 Ddg/26.0

Browser/OS: Mobile Safari 26 on iOS 18.6

View result in a separate tab

comparison

469.0M/s

indexof

438.0M/s

equality

271.5M/s

48.0M/s

View exact numbers

Test name	Executions per second
✓ comparison	468,960,096 Ops/sec
indexof	438,004,032 Ops/sec
equality	271,548,000 Ops/sec
in	48,004,056 Ops/sec

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 and explain what's being tested, compared, and their pros and cons.

**Benchmark Overview**

The test measures the performance of JavaScript equality checks, comparisons, and use of the "in" operator on an array with fixed values. The benchmark compares four different approaches:

1. Equality check using `===` (e.g., `j[0] === d && ...`)
2. Comparison check using `<=` and `>=` operators (e.g., `j[0] <= d <= j[1]`)
3. Use of the "in" operator (e.g., `d in j`)
4. Use of `indexOf()` method to find the index of an element in the array (e.g., `j.indexOf(d)`)

**Comparison Approach**

Here's a brief explanation of each approach:

* **Equality check (`===`)**: This is the most straightforward way to compare two values. However, it may not be as efficient as other approaches, especially for large arrays.
* **Comparison check using `<`, `>`, `<=`, and `>=`**: This approach can be faster than equality checks because it avoids creating intermediate objects or performing additional operations. However, it may not work correctly if the array values are complex objects with many properties.
* **Use of "in" operator**: The "in" operator returns a boolean value indicating whether an element is present in the array. This approach can be slower than the comparison check because JavaScript has to search for the element in the array.
* **Use of `indexOf()` method**: This approach searches for the first occurrence of the specified value in the array and returns its index. If the value is not found, it returns -1.

**Pros and Cons**

Here's a summary of the pros and cons of each approach:

* **Equality check (`===`)**:
	+ Pros: Simple, widely supported, and works well for primitive values.
	+ Cons: May be slower than comparison checks or "in" operator for large arrays.
* **Comparison check using `<`, `>`, `<=`, and `>=`**:
	+ Pros: Can be faster than equality checks, especially when the array contains many properties.
	+ Cons: May not work correctly with complex objects or arrays.
* **Use of "in" operator**: 
	+ Pros: Easy to use and works well for simple arrays.
	+ Cons: May be slower than comparison checks due to search overhead.
* **Use of `indexOf()` method**:
	+ Pros: Returns the index of the first occurrence, which can be useful in some cases.
	+ Cons: Slower than other approaches, especially when searching for a specific element in large arrays.

**Library and Special JS Features**

There are no libraries used in this benchmark. However, it's worth noting that the use of `indexOf()` method relies on JavaScript's built-in array methods.

No special JavaScript features or syntaxes are used in this benchmark.

**Other Alternatives**

Alternative approaches to measure performance include:

* **Using a different data structure**, such as an object or a Set, instead of an array.
* **Measuring the time complexity** of each approach using Big O notation (e.g., O(n), O(log n), etc.).
* **Comparing the performance of different JavaScript engines**, such as V8, SpiderMonkey, or Safari's JavaScript engine.

These alternatives can provide more insights into the performance characteristics of each approach and help developers optimize their code for better performance.

equality vs comparison (version: 0) Benchmark.js

Comparing performance of: `comparison vs equality vs in vs indexof`

Created: 9 years ago by: Guest

Go to the latest result

comparison

equality

in

indexof

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

equality vs comparison (version: 0) Benchmark.js

Comparing performance of: comparison vs equality vs in vs indexof

Created: 9 years ago by: Guest

Go to the latest result

comparison

equality

in

indexof

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Comparing performance of: `comparison vs equality vs in vs indexof`