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Number vs + vs parseInt
(version: 0)
Comparing performance of:
Number vs Unary + vs parseInt
Created:
5 years ago
by:
Guest
Go to the latest result
Tests:
Number
var number = Number(Math.random().toString());
Unary +
var unary = +Math.random().toString();
parseInt
var parse = parseInt(Math.random().toString(), 10);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Number
Unary +
parseInt
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:136.0) Gecko/20100101 Firefox/136.0
Browser/OS:
Firefox 136 on Windows
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<iframe src="https://measurethat.net/Embed?id=590739" width="100%" height="500px"></iframe>
parseInt
260.1M/s
Unary +
8.5M/s
Number
8.4M/s
View exact numbers
Test name
Executions per second
✓
parseInt
260,149,728 Ops/sec
Unary +
8,502,796 Ops/sec
Number
8,380,920 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to help you understand what's being tested in the provided benchmark. **Benchmark Overview** The benchmark is designed to measure the performance difference between three ways of converting a random string to a number: using the built-in `Number` function, the unary plus operator (`+`), and the `parseInt` function. **Options Compared** There are three test cases: 1. **Number**: This test case uses the `Number` function to convert a random string to a number. 2. **Unary +**: This test case uses the unary plus operator (`+`) to convert a random string to a number. 3. **parseInt**: This test case uses the `parseInt` function to convert a random string to an integer, with the radix (base) set to 10. **Pros and Cons of Each Approach** 1. **Number**: This approach is simple and efficient, as it only requires a single function call. However, it may not work correctly for certain types of input strings. 2. **Unary +**: This approach is also simple and efficient, but it can be slower than the `Number` function due to the overhead of evaluating the operator. Additionally, this approach assumes that the input string can always be converted to a number using the unary plus operator, which may not always be the case. 3. **parseInt**: This approach provides more control over the conversion process, as it allows specifying the radix (base) for conversion from a string to an integer. However, it requires more function calls than the `Number` and unary + approaches. **Library Usage** None of the test cases use any external libraries. **Special JavaScript Features or Syntax** There are no special JavaScript features or syntax used in these test cases. The focus is on comparing the performance of different ways to convert a string to a number. **Other Alternatives** If you want to measure the performance of other ways to convert a string to a number, such as using `parseFloat` instead of `Number`, or experimenting with different radix values for `parseInt`, you can modify the benchmark definition and test cases accordingly. For example, you could add another test case like this: ``` { "Benchmark Definition": "var float = parseFloat(Math.random().toString());", "Test Name": "parseFloat" } ``` This would allow you to compare the performance of different ways to convert a string to a number, including `Number`, unary +, `parseInt`, and `parseFloat`.
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