Benchmark: parse vs plus vs number

Script Preparation code:

var t;
function t1() {
	t = +'100000000';
}

function t2() {
	t = parseInt('100000000', 10);
}

function t3() {
	t = Number('100000000');
}

Tests:

Test 1
t1();
Test 2
t2();
Test 3
t3();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Test 1
Test 2
Test 3

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one month ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser/OS: Chrome 134 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Test 1	270549664.0 Ops/sec
Test 2	276620480.0 Ops/sec
Test 3	253246960.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and explain what's being tested, the different approaches compared, their pros and cons, and other considerations.

**Benchmark Definition**

The benchmark definition is a JSON object that contains three functions: `t1`, `t2`, and `t3`. These functions are used to test the parsing of large numbers in JavaScript. The script preparation code defines the variables and functions used in each test case:

* `t` is an array variable initialized with a string value.
* `t1` converts the string `'100000000'` to a number using the unary plus operator (`+`) and assigns it to the `t` variable.
* `t2` uses the `parseInt()` function to convert the string `'100000000'` to an integer, specifying base 10 as the radix. The result is assigned to the `t` variable.
* `t3` uses the `Number()` function to convert the string `'100000000'` to a number and assigns it to the `t` variable.

**Test Cases**

There are three test cases defined in the benchmark:

1. **Test 1**: Calls the `t1()` function.
2. **Test 2**: Calls the `t2()` function.
3. **Test 3**: Calls the `t3()` function.

These tests measure the execution time of each parsing approach ( unary plus, `parseInt()`, and `Number()`).

**Libraries and Special Features**

None of the test cases use any external libraries or special JavaScript features beyond basic arithmetic operations.

**Approaches Compared**

The three approaches compared are:

1. **Unary Plus (`+`)**: Uses the unary plus operator to convert a string to a number.
2. `parseInt()`: A built-in function that converts a string to an integer, specifying base 10 as the radix.
3. `Number()`: A built-in function that converts a string to a number.

**Pros and Cons**

* **Unary Plus (`+`)**:
	+ Pros: Simple and widely supported across browsers.
	+ Cons: May be slower due to string parsing and potential issues with non-numeric strings.
* `parseInt()`:
	+ Pros: Faster than unary plus for numeric strings, with less overhead.
	+ Cons: Requires specifying the radix, which can lead to errors if not provided.
* `Number()`:
	+ Pros: Faster and more convenient than `parseInt()`, as it automatically detects the radix.
	+ Cons: May be slower for very large numbers due to its internal implementation.

**Other Considerations**

* The benchmark uses a fixed input string (`'100000000'`) which may not represent real-world scenarios. Using larger or more complex inputs might provide more accurate results.
* The `DevicePlatform` and `OperatingSystem` fields in the latest benchmark result are likely used for profiling and performance analysis, but they don't directly impact the comparison of parsing approaches.

**Alternatives**

Other alternatives for converting strings to numbers include:

* Regular expressions (`RegExp`)
* String methods like `toString()`, `toFixed()`, or `toLocaleString()`
* Other libraries like `lodash` or `moment`

However, these alternatives may not be as widely supported or performant as the built-in unary plus, `parseInt()`, and `Number()` approaches.

Related benchmarks:

parse vs plus vs number (version: 0)

Comparing performance of: Test 1 vs Test 2 vs Test 3

Created: 4 years ago by: Guest

Jump to the latest result

Test 1

Test 2

Test 3

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):