Benchmark: Int conversion - MeasureThat.net

Tests:

parseInt
var str = "150"; parseInt(str,10);
+str
var str = "150"; +str;
Number()
var str = "150"; Number(str);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
parseInt
+str
Number()

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/132.0.0.0 Safari/537.36

Browser/OS: Chrome 132 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
parseInt	108334600.0 Ops/sec
+str	121556184.0 Ops/sec
Number()	103524528.0 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**
The benchmark definition is empty, which means that the script preparation code is not provided. This can be either intentional or an omission. In this case, we'll assume it's intentional.

**Individual Test Cases**

There are three test cases:

1. `parseInt`: Tests the `parseInt` function, which converts a string to its integer equivalent. The benchmark definition specifies that the input string is `"150"` and the radix is set to 10.
2. `+str`: Tests the expression `+str`, where `str` is the input string `"150"`. This is equivalent to concatenating an empty string with the input string using the unary plus operator (`++`) or using the spread operator (`...`).
3. `Number()`: Tests the `Number()` function, which converts a string to its floating-point number equivalent.

**Options Compared**

In each test case:

*   For `parseInt`, only one execution is being measured: converting the input string `"150"` to an integer with radix 10.
*   For `+str` and `Number()`, multiple executions are likely being measured, as these functions can handle different formats of input strings. However, in this specific benchmark, only two executions are shown:
    *   For `+str`, converting the input string `"150"` to a number using the unary plus operator (`++`) or spread operator (`...`).
    *   For `Number()`, no additional execution is explicitly shown, but it's likely that the test measures multiple conversions with different formats of input strings.

**Pros and Cons**

*   **`parseInt`:**
    *   Pros:
        *   Specifics the radix for accurate conversion.
        *   Fastest execution time.
    *   Cons:
        *   Only tested with a single radix value.
        *   May not handle edge cases or invalid input.
*   `+str` and `Number()`: 
    *   These functions are generally faster than `parseInt` due to their ability to parse multiple formats and handle more cases.
    *   However, they might be slower in certain specific scenarios where the radix is known (as with `parseInt`). Additionally, these methods may still not cover all possible cases.

**Library Usage**

None of the test cases explicitly use a JavaScript library. The focus is on testing the built-in functions and syntax.

**Special JS Features or Syntax**
There are no special features or syntax mentioned in the benchmark definitions or test results.

**Alternatives**

For converting strings to numbers, alternatives include:

*   **`Number()` with `replace()`:`
    *   Convert input string to a number using `Number()` and then apply any necessary formatting with `replace()`.
*   **Using regex:**
    *   Use regular expressions (regex) to extract the numeric part from the input string.
*   **Manual parsing:**
    *   Implement manual logic to parse the input string, potentially using techniques like removing non-numeric characters and then converting what remains to a number.

Each approach has its pros and cons, depending on the specific requirements and constraints of your application.

Related benchmarks:

Int conversion (version: 0)

Comparing performance of: parseInt vs +str vs Number()

Created: 4 years ago by: Guest

Jump to the latest result

parseInt

+str

Number()

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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