Benchmark: ! vs === (fixed)

Tests:

!
const a = []; if (!a.length) { console.log(''); }
===
const a = []; if (a.length === 0) { console.log(''); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
!
===

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Linux; Android 10; Redmi K20 Pro) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.162 Mobile Safari/537.36

Browser/OS: Chrome Mobile 80 on Android

View result in a separate tab

Test name	Executions per second
!	50820.6 Ops/sec
===	49295.7 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and explain what's being tested, the options compared, pros and cons of each approach, library usage, special JS features or syntax, and alternative approaches.

**Benchmark Overview**

The benchmark compares two operators: `!` (logical NOT) and `===` (strict equality with type coercion). The goal is to determine which operator performs better in terms of execution speed on various devices running different versions of Chrome Mobile 80.

**Test Cases**

There are only two test cases:

1. `!`: This test case checks if an empty array (`const a = []`) has any elements using the logical NOT operator (`if (!a.length)`). The expected output is an empty string (`console.log('')`).
2. `===`: This test case checks if an empty array (`const a = [])`) has no elements using the strict equality operator with type coercion (`if (a.length === 0)`). The expected output is also an empty string (`console.log('')`).

**Options Compared**

The two operators being compared are:

1. `!`: Logical NOT operator.
2. `===`: Strict equality operator with type coercion.

**Pros and Cons of Each Approach**

* **Logical NOT Operator (`!`)**:
	+ Pros:
		- Lightweight and simple to implement.
		- Fast execution speed due to its basic logical operation.
	+ Cons:
		- Can lead to unexpected behavior if used incorrectly (e.g., with boolean values).
		- May not be the most intuitive choice for checking array emptiness.
* **Strict Equality Operator (`===`)**:
	+ Pros:
		- More explicit and safer than using `!`.
		- Ensures type coercion, which can help prevent unexpected behavior.
	+ Cons:
		- Slightly slower execution speed due to the additional type coercion step.

**Library Usage**

There is no library usage in these benchmark test cases. Both tests rely solely on native JavaScript features.

**Special JS Features or Syntax**

None of the test cases use any special JS features or syntax that requires explanation.

**Alternative Approaches**

If you need to check if an array is empty, there are alternative approaches:

1. Use `Array.isArray()` followed by a conditional check: `if (Array.isArray(a) && a.length === 0)`.
2. Use the `some()` method with a callback function that always returns false for empty arrays: `if (!a.some(() => false))`.
3. Use the `every()` method with a callback function that always returns true for empty arrays: `if (!a.every(() => true))`.

These alternatives may have different performance characteristics or readability implications compared to using the logical NOT operator (`!`) or strict equality operator (`===`).

Related benchmarks:

! vs === (fixed) (version: 0)

Comparing performance of: ! vs ===

Created: 4 years ago by: Guest

Jump to the latest result

!

===

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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