Benchmark: Fastest results - MeasureThat.net

Script Preparation code:

window.case1 = new Proxy({}, {
  isNumeric(str) {
    return !isNaN(parseInt(str));
}
});
window.case2 = new Proxy({}, {
 isNumeric(str) {
    for (let i = 0; i < str.length; i++) {
        // check if the character at position i is not a digit
        if (str[i] < '0' || str[i] > '9') {
            return false;
        }
    }
    return str.length > 0;
	}
});
window.case3 = new Proxy({}, {
 isNumeric(str) {
    return /^[0-9]*$/.test(str);
}
});

window.gabage1 = 0;
window.gabage2 = 0;
window.gabage3 =0;

Tests:

isNan
for (let i = 0; i < 1e6;i++) { gabage1 =+ case1[i]; }
Checks characters for numbers
for (let i = 0; i < 1e6;i++) { gabage2 += case2[i]; }
Regex
for (let i = 0; i < 1e6;i++) { gabage3 += case3[i]; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
isNan
Checks characters for numbers
Regex

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.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is defined in JSON format, which includes two main parts:

1. **Script Preparation Code**: This code sets up three proxy objects (`case1`, `case2`, and `case3`) that will be used to test different approaches for determining whether a string represents a number or not.
2. **Html Preparation Code**: This field is empty in the provided benchmark, indicating that no HTML-related preparation is needed.

**Individual Test Cases**

The benchmark includes three individual test cases, each defined by:

1. **Benchmark Definition**: A JavaScript code snippet that will be executed repeatedly to measure performance.
2. **Test Name**: A descriptive name for the test case.

Here's a brief explanation of each test case:

* **isNan**: This test case checks if `case1` is able to correctly identify NaN (Not a Number) values as non-numeric.
* **Checks characters for numbers**: This test case verifies that `case2` can accurately check whether a string contains only digits and no other characters.
* **Regex**: This test case uses `case3` to test its regular expression-based approach for determining if a string represents a number.

**Options Compared**

The three test cases compare different approaches for checking if a string is numeric:

1. **Proxy Object Approach (case1)**: Uses a proxy object with an `isNumeric` method that checks if the input string can be parsed to an integer using `parseInt`.
2. **Custom Loop Approach (case2)**: Iterates over each character in the input string and checks if it's a digit (using ASCII code comparisons).
3. **Regular Expression Approach (case3)**: Uses a regular expression (`^[0-9]*$`) to match only digits at the start of the string.

**Pros and Cons**

Here's a brief summary of each approach:

* **Proxy Object Approach**:
	+ Pros: Simple, efficient, and concise.
	+ Cons: May not work correctly for very large strings or complex input data (e.g., Unicode).
* **Custom Loop Approach**:
	+ Pros: Works well with non-ASCII characters and can handle larger input strings.
	+ Cons: Less efficient than the proxy object approach due to the loop overhead.
* **Regular Expression Approach**:
	+ Pros: Highly flexible and works well for most numeric string inputs.
	+ Cons: May be slower than the other two approaches due to regular expression compilation.

**Library and Special JS Features**

No specific libraries are used in this benchmark. However, some subtle features are worth noting:

* **Proxy Objects**: Used to create a custom `isNumeric` method that can be invoked on an object.
* **NaN (Not a Number)**: A built-in JavaScript value indicating a number that is not a valid number.

**Other Alternatives**

If you're interested in exploring other approaches for numeric string validation, consider the following:

1. **String.prototype.isdigit()**: A modern JavaScript method that returns a boolean indicating whether all characters in the string are digits.
2. **Array.from() and every()**: Using `Array.from()` to iterate over each character in the input string and then using `every()` to check if all characters match the digit pattern.
3. **Using a dedicated library**: Libraries like `numjs` or `decimal.js` provide optimized numeric functionality, including validation.

Keep in mind that performance optimizations should always be tailored to your specific use case and requirements.

Related benchmarks:

Fastest results (version: 0)

Comparing performance of: isNan vs Checks characters for numbers vs Regex

Created: 2 years ago by: Guest

Jump to the latest result

isNan

Checks characters for numbers

Regex

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):