Benchmark: Replace first or not

Script Preparation code:

window.ARRAY = [
  '1',
  '1.01',
  '1,01',
  '13.45',
  '13,45'
]

window.RESULTS = []

Tests:

delo
window.RESULTS = []; for (var i = 0; i < window.ARRAY.length; i++){ var val = window.ARRAY[i]; var isNumber = Number(val); if (isNaN(isNumber)) { isNumber = Number(val.replace(',', '.')); } window.RESULTS.push(!(isNaN(isNumber) || isNumber < 0)); }
replace first
window.RESULTS = []; for (var i = 0; i < window.ARRAY.length; i++){ var val = window.ARRAY[i].replace(',', '.'); var isNumber = Number(val); window.RESULTS.push(!(isNaN(isNumber) || isNumber < 0)); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
delo
replace first

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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 JSON and explain what's being tested.

**Benchmark Definition**

The benchmark definition is a simple JavaScript script that creates an array `ARRAY` with various string values, including numbers with commas as decimal separators. The goal of the benchmark is to measure the performance of different approaches for checking if a value in the array is a number.

**Options Compared**

There are two options being compared:

1. **Method 1: Using `Number()` and then checking with `isNaN()`**
	* In this approach, each value in the array is first converted to a number using `Number()`, and then the result is checked for NaN (Not a Number) using `isNaN()`.
	* Pros: This method is straightforward and easy to understand.
	* Cons: It can be slower than other approaches because of the conversion step.
2. **Method 2: Using `replace()` with a regular expression**
	* In this approach, each value in the array is first replaced with its decimal-separated equivalent using a regular expression (`val.replace(',', '.')`).
	* Then, the resulting string is converted to a number using `Number()`, and the result is checked for NaN.
	* Pros: This method can be faster because it avoids the conversion step.
	* Cons: It requires knowledge of regular expressions, which might not be familiar to all developers.

**Library Used**

In both benchmark definitions, no external libraries are used. The code only relies on built-in JavaScript functions and data structures.

**Special JS Feature or Syntax (None)**

There is no special JavaScript feature or syntax being tested in this benchmark.

**Other Alternatives**

Other possible approaches for checking if a value is a number could include:

* Using `typeof` operator to check the type of the value (`typeof val === 'number'`)
* Using a try-catch block to catch NaN errors
* Using a more complex regular expression-based approach

However, these alternatives are not being tested in this benchmark.

**Test Cases**

There are two test cases:

1. **Method 1: `delo`**
	* This test case checks the performance of Method 1, where each value is converted to a number using `Number()` and then checked for NaN.
2. **Method 2: `replace first`**
	* This test case checks the performance of Method 2, where each value is replaced with its decimal-separated equivalent using a regular expression and then converted to a number.

The benchmark results show that Method 2 (`replace first`) is slightly faster than Method 1 (`delo`). However, the actual performance difference may depend on various factors, such as the specific use case and the JavaScript engine used.

Related benchmarks:

Replace first or not (version: 0)

Comparing performance of: delo vs replace first

Created: 3 years ago by: Guest

Jump to the latest result

delo

replace first

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):