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:

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

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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: 6 years ago by: Guest

Jump to the latest result

!

===

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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