Benchmark: Number parsing - MeasureThat.net

Tests:

Number
Number('9') === 9
parseInt
parseInt('9', 10) === 9
bitwise right
('9' >> 0) === 9
Multiply by 1
('9' * 1) === 9
not not
(~~'9') === 9

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Number
parseInt
bitwise right
Multiply by 1
not not

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.

The provided JSON represents a JavaScript microbenchmarking test suite. It includes a benchmark definition and multiple individual test cases.

**Benchmark Definition:**
The benchmark definition is an empty object, which means that no specific operation or functionality is being tested. Instead, the focus is on comparing different approaches to perform simple arithmetic operations.

**Individual Test Cases:**
There are four test cases:

1. `Number('9') === 9`
	* This test case checks if the `Number` function converts a string `'9'` to its integer equivalent, which is indeed `9`. The `Number` function is used to convert string literals to numbers.
2. `parseInt('9', 10) === 9`
	* This test case checks if the `parseInt` function with a radix of `10` converts the string `'9'` to its integer equivalent, which is indeed `9`. The `parseInt` function is used to convert string literals to integers with a specified radix.
3. `( '9' >> 0 ) === 9`
	* This test case checks if the bitwise right shift operator (`>>`) on the string `'9'` produces an integer equivalent of `9`. Note that this is a non-standard usage, as the bitwise operators are meant for numerical values only.
4. `( '9' * 1 ) === 9`
	* This test case checks if multiplying the string `'9'` by `1` produces an integer equivalent of `9`. Multiplying a string by `1` is not a standard operation, but it might be used as a trick to get around type checking.

**Libraries and Special Features:**

None of the individual test cases use any external libraries. However, some test cases may rely on browser-specific features or implementations, such as the bitwise right shift operator (`>>`).

**Options Comparison:**
The benchmark is comparing different approaches for simple arithmetic operations:

* `Number` vs. direct string conversion
* `parseInt` with radix 10 vs. direct string conversion
* Bitwise right shift operator (`>>`) on a string (non-standard usage)
* Multiplying a string by `1` (not a standard operation)

The pros and cons of these approaches are as follows:

* `Number`: Simple and widely supported, but might be slower due to the overhead of function calls.
* `parseInt`: Faster than direct conversion for strings with non-numeric characters, but slower for numeric strings. The radix parameter allows for more flexibility.
* Bitwise right shift operator (`>>`): Non-standard usage, may not work in all browsers or environments. Can produce unexpected results due to the binary representation of strings.
* Multiplying a string by `1`: Not a standard operation, might be slower than direct conversion.

**Other Considerations:**

* The benchmark is comparing different approaches to simple arithmetic operations, which are often used in numerical computations.
* The test cases cover various scenarios, such as converting strings to numbers and performing basic arithmetic operations.
* The benchmark can help identify performance differences between these approaches in different browsers or environments.

As for alternatives, some other approaches could be tested:

* Using `Number()` with the `replace()` method instead of direct string conversion
* Using a library like `lodash` with its `parse()` function instead of `parseInt`
* Comparing the performance of different numeric libraries (e.g., `Mathjs`)

Related benchmarks:

Number parsing (version: 0)

Comparing performance of: Number vs parseInt vs bitwise right vs Multiply by 1 vs not not

Created: 3 years ago by: Guest

Jump to the latest result

Number

parseInt

bitwise right

Multiply by 1

not not

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):