Benchmark: isFinite vs isInteger

Script Preparation code:

count = 0;
vars = Array.from({length: 100}, (...[, i]) => i + 1);

Tests:

isFinite
vars.forEach((v) => { if (Number.isFinite(v)) { count++ } });
isInteger
vars.forEach((v) => { if (Number.isFinite(v)) { count++ } });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
isFinite
isInteger

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser/OS: Chrome 126 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
isFinite	29533.3 Ops/sec
isInteger	29437.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided JSON and benchmark preparation code to explain what's being tested, compared options, pros and cons, library usage, special JS features, and alternatives.

**Benchmark Definition JSON**

The JSON represents a JavaScript microbenchmark test case with two sub-test cases:

* `isFinite` vs `isInteger`: This is the main comparison between two built-in JavaScript functions: `Number.isFinite()` and `Number.isInteger()`.
* The benchmark measures how many iterations each function can handle before exceeding a certain limit (not explicitly defined in the JSON).

**Script Preparation Code**

The script preparation code initializes an array `vars` with 100 elements, where each element is an integer from 1 to 100. This array will be used as input for both test cases.

```javascript
count = 0;
vars = Array.from({length: 100}, (...[, i]) => i + 1);
```

**Html Preparation Code**

The HTML preparation code is empty, which means that no HTML elements are being generated or manipulated during the benchmarking process.

**Individual Test Cases**

There are two test cases:

* `isFinite`: This test case iterates through each element in the `vars` array and checks if it's a finite number using `Number.isFinite()`. The count of successful iterations is incremented.
* `isInteger`: This test case is identical to the `isFinite` test case, but with an additional check: it also verifies that the number is an integer using `Number.isInteger()`.

**Library Usage**

Neither of the test cases uses any external libraries. However, `Array.from()` is a modern JavaScript method for creating arrays (introduced in ECMAScript 2015).

**Special JS Features or Syntax**

There are no special JS features or syntax used in this benchmarking code.

**Pros and Cons of Comparison Options**

The two comparison options have different performance implications:

* `Number.isFinite()`: This function checks if a number is finite (not NaN) but does not verify whether the number is an integer. It's faster because it only needs to check for finiteness.
* `Number.isInteger()`: This function checks both if a number is finite and an integer. It's slower than `isFinite()` because it performs an additional check.

**When to use each:**

* Use `Number.isFinite()` when:
	+ You want to verify that a number is not NaN (Not a Number).
	+ Speed is crucial.
* Use `Number.isInteger()` when:
	+ You need to ensure that a number is both finite and an integer.
	+ You're dealing with very large numbers or complex arithmetic.

**Alternatives**

Some possible alternatives for the test cases could be:

* Using `Number.EPSILON` to check for finiteness instead of `Number.isFinite()`.
* Implementing a custom function to verify whether a number is an integer.
* Comparing performance between different JavaScript engines (e.g., V8, SpiderMonkey) or versions.

However, these alternatives might not be as straightforward to implement and maintain as the built-in `isFinite()` and `isInteger()` methods.

Related benchmarks:

isFinite vs isInteger (version: 0)

Comparing performance of: isFinite vs isInteger

Created: one year ago by: Guest

Jump to the latest result

isFinite

isInteger

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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