Benchmark: boolean vs math length

Script Preparation code:

var arr = [];
var arr2 = ['1', '2'];

Tests:

boolean empty
!arr.length
math empty
arr.length <= 0
boolean
!arr2.length
math
arr2.length <= 0

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
boolean empty
math empty
boolean
math

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Measuring JavaScript performance is an important task for developers, especially when comparing different libraries or approaches. In this case, we have a benchmark defined on MeasureThat.net that tests the performance of two ways to check if an array is empty: using boolean expressions and using mathematical comparisons.

**Benchmark Definition**

The provided benchmark definition represents a simple test that compares the performance of two methods:

1. Using a boolean expression (`!arr.length`)
2. Using a mathematical comparison (`arr.length <= 0`)

The script preparation code initializes two arrays, `arr` and `arr2`, with different lengths.

**Test Cases**

There are four test cases in total, each representing one of the two methods:

1. **Boolean empty**: `!arr.length`
2. **Math empty**: `arr.length <= 0`
3. **Boolean**: `!arr2.length`
4. **Math**: `arr2.length <= 0`

Each test case executes the corresponding benchmark definition and measures the execution time.

**Comparison of Options**

The two options being compared are:

1. **Boolean expressions**: Using the `!` operator to negate the length property of an array.
	* Pros:
		+ Simple and concise syntax
		+ Easy to read and understand
	* Cons:
		+ May be slower due to string concatenation or other overheads
2. **Mathematical comparisons**: Using the `<`, `<=`, `>=`, and `>` operators to compare the length property of an array.
	* Pros:
		+ Generally faster than boolean expressions, as they avoid string concatenation and negation
		+ More explicit and clear syntax
	* Cons:
		+ May be less concise or readable for some developers

**Library and Syntax**

In this benchmark, no libraries are explicitly used. However, it's worth noting that the `!` operator is a special case in JavaScript, as it checks if the value on its left is falsy.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax being tested here. The focus is on comparing two different approaches to check for array emptiness.

**Other Alternatives**

If you need to compare other methods for checking if an array is empty, some alternatives might include:

1. Using `Array.isArray()` and then checking the length of the array.
2. Using a custom function that checks if an array is empty, such as by iterating over its elements or using a library like Lodash.

However, these alternatives are not being tested in this specific benchmark, which focuses on comparing boolean expressions versus mathematical comparisons.

Related benchmarks:

boolean vs math length (version: 0)

Comparing performance of: boolean empty vs math empty vs boolean vs math

Created: 3 years ago by: Guest

Jump to the latest result

boolean empty

math empty

boolean

math

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):