Benchmark: parseVsNumber - MeasureThat.net

Script Preparation code:

var number = '10000'

Tests:

parseInt
parseInt(number);
Number
Number(number);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
parseInt
Number

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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Let's break down the provided benchmark and explain what's being tested, compared, and the pros/cons of each approach.

**Benchmark Context**

The benchmark is measuring the performance of two ways to parse a string representing a number: using `parseInt()` or `Number()`. The benchmark tests these functions in isolation.

**Options Being Compared**

1. **parseInt()**: This function converts a string representation of an integer into a number.
2. **Number()**: This function also converts a string representation of a number to a number.

**Pros and Cons of Each Approach**

*   **parseInt():**
    *   Pros:
        *   More efficient, as it stops parsing at the first non-numeric character.
        *   Can handle larger numbers due to its ability to stop parsing early.
    *   Cons:
        *   Can throw a TypeError if the input string is not a valid integer representation.
*   **Number():**
    *   Pros:
        *   More intuitive and straightforward, as it returns NaN (Not a Number) if the input is invalid.
        *   Suitable for parsing strings with decimal points or other special characters.
    *   Cons:
        *   Less efficient than parseInt() due to its need to parse the entire string.

**Special Consideration**

There's no mention of any special JavaScript features or syntax in this benchmark. The focus remains on comparing two standard numeric parsing functions.

**Library and Its Purpose (if applicable)**

In this benchmark, there's no library being used explicitly for parsing numbers. However, it's essential to note that `parseInt()` can sometimes use the `Intl.NumberFormat` API (available since ECMAScript 2019) under the hood to parse decimal separators correctly.

**Other Alternatives**

If you're looking for alternative ways to parse numbers in JavaScript:

*   **String.prototype.parseInt()**: This method is similar to parseInt(), but it's available on strings and can be used as a shorthand way to convert a string to an integer.
*   **String.prototype.attemptParseInt()**: This method attempts to parse the string representation of an integer and returns NaN (Not a Number) if successful. It's useful when you want to handle invalid inputs gracefully.

Example usage:

```javascript
let numberStr = '123';

// Using parseInt()
let parsedNumber1 = parseInt(numberStr);
console.log(parsedNumber1); // Output: 123

// Using String.prototype.parseInt()
let parsedNumber2 = numberStr.parseLong();
console.log(parsedNumber2); // Output: 123 (or NaN if invalid)
```

For the `String.prototype.attemptParseInt()` method, you would need to import it from a library or implement it yourself:

```javascript
function attemptParseInt(str) {
    try {
        return parseInt(str);
    } catch (e) {
        return NaN;
    }
}

let numberStr = '123';

// Using String.prototype.attemptParseInt()
let parsedNumber = attemptParseInt(numberStr);
console.log(parsedNumber); // Output: 123
```

Related benchmarks:

parseVsNumber (version: 0)

Comparing performance of: parseInt vs Number

Created: 9 years ago by: Guest

Jump to the latest result

parseInt

Number

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):