Benchmark: parseInt vs - MeasureThat.net

Script Preparation code:

var el = "5555"

Tests:

parseInt
for (var i = 0; i < 10000; i++) { x = parseInt(el, 10) }
Bitwise
for (var i = 0; i < 10000; i++) { x = el >> 0 }
Number
for (var i = 0; i < 10000; i++) { x = Number(el) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
parseInt
Bitwise
Number

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 dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition and Preparation**

The provided JSON represents a benchmark definition, which includes:

1. **Script Preparation Code**: A string variable `el` is assigned the value `"5555"`. This code is executed before running each test case.
2. **Html Preparation Code**: There is no HTML preparation code specified, meaning that no additional setup or configuration is required to run the benchmark.

The purpose of this script is to create a constant string value `el`, which will be used in the subsequent test cases.

**Individual Test Cases**

There are three individual test cases:

1. **parseInt**
```javascript
for (var i = 0; i < 10000; i++) {
  x = parseInt(el, 10)
}
```
This test case uses the built-in `parseInt()` function to convert the string value `el` to an integer. The second argument `10` specifies the radix (base) of the conversion.

**Bitwise**
```javascript
for (var i = 0; i < 10000; i++) {
  x = el >> 0
}
```
This test case uses a bitwise right shift operation (`>>`) to extract the integer value from the string `el`. The `>>` operator shifts the bits of the number and fills 0 on voids left as a result. In this case, shifting by 0 is equivalent to not shifting at all.

**Number**
```javascript
for (var i = 0; i < 10000; i++) {
  x = Number(el)
}
```
This test case uses the `Number()` function to convert the string value `el` to a number. This function returns either a number or NaN (Not a Number) depending on whether the conversion is possible.

**Pros and Cons**

* **parseInt()**: Pros: More human-readable input, Can be used for parsing decimal numbers. Cons: May throw errors if the radix is not specified correctly.
* **Bitwise**: Pros: Fastest and most efficient way to extract an integer value from a string. Cons: Limited use cases and may require additional processing.
* **Number()**: Pros: Simple and easy to use, Can be used for parsing decimal numbers. Cons: May return NaN if the conversion is not possible.

**Libraries and Special JS Features**

There are no external libraries required for these benchmark tests.

**Special JS Feature**

None of these test cases utilize any special JavaScript features, such as async/await or promises.

**Other Alternatives**

If you were to compare these approaches using a different framework or tool, you might consider the following alternatives:

* **ES6 template literals**: Instead of using `parseInt()` or `Number()`, you could use ES6 template literals to parse and convert string values to numbers.
* **Math.trunc()**: This function is available in modern browsers and can be used to extract an integer value from a string without rounding or truncating.

Keep in mind that the choice of approach depends on your specific requirements, performance considerations, and personal preference.

Related benchmarks:

parseInt vs (version: 0)

Comparing performance of: parseInt vs Bitwise vs Number

Created: 3 years ago by: Guest

Jump to the latest result

parseInt

Bitwise

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):