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parseInt vs Number vs ~~
(version: 0)
Comparing performance of:
No conversion vs parseInt vs Number vs ~~
Created:
2 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var intA = 42.034; var strB = "42.034";
Tests:
No conversion
var res = intA + strB;
parseInt
var res = parseInt(intA) + parseInt(strB);
Number
var res = Number(intA) + Number(strB);
~~
var res = ~~intA + ~~strB;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
No conversion
parseInt
Number
~~
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:120.0) Gecko/20100101 Firefox/120.0
Browser/OS:
Firefox 120 on Mac OS X 10.15
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=488185" width="100%" height="500px"></iframe>
No conversion
745.4M/s
parseInt
743.6M/s
~~
743.3M/s
Number
34.9M/s
View exact numbers
Test name
Executions per second
✓
No conversion
745,357,568 Ops/sec
parseInt
743,623,808 Ops/sec
~~
743,337,600 Ops/sec
Number
34,903,272 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks. **Benchmark Definition** The provided JSON represents a benchmark that tests the performance of three different ways to perform numerical conversions in JavaScript: 1. `parseInt` 2. `Number` 3. `~~` (the bitwise NOT operator, which can be used as a "trick" to convert a string to an integer) These three methods are compared for their execution speed. **Options Compared** The options being compared are the different ways to perform numerical conversions in JavaScript: 1. **parseInt**: Converts a string to an integer using the `parseInt` function. 2. **Number**: Converts a string to a number using the `Number` function. 3. **~~**: Uses the bitwise NOT operator (`~~`) to convert a string to an integer. **Pros and Cons of Each Approach** Here's a brief summary of each approach: 1. **parseInt**: * Pros: Portable, widely supported, and relatively fast. * Cons: Can lead to unexpected behavior if the input string is not in the expected format (e.g., "42.034" would be converted to 42). 2. **Number**: * Pros: More modern and flexible than `parseInt`, can handle more complex inputs. * Cons: May be slower than `parseInt` due to its overhead, and may lead to unexpected behavior if the input string is not in a numeric format. 3. **~~**: * Pros: Fast and lightweight, with minimal overhead. * Cons: Non-standard and non-portable (not supported by all browsers), can lead to incorrect results if used incorrectly. **Library** None of these options rely on any external libraries. They are built-in JavaScript features or operators. **Special JS Feature/Syntax** No special JavaScript features or syntax are being tested in this benchmark, other than the `~~` operator which is a bit unconventional but widely supported. **Other Considerations** The benchmark does not account for the type of input data (e.g., floating-point numbers vs. integers) and may produce different results depending on the specific inputs used. **Alternatives** If you're looking for alternative methods to perform numerical conversions in JavaScript, some options include: 1. Using a dedicated library like `lodash` or `moment.js`, which provide more robust and feature-rich functions for working with numbers. 2. Utilizing modern JavaScript features like template literals (`${}>)`) or computed property names (e.g., `{ foo: bar }[bar]`) to create dynamic numerical expressions. 3. Implementing custom conversion logic using regular expressions or other string manipulation techniques. Keep in mind that these alternatives may have their own trade-offs and performance implications, so it's essential to evaluate the specific use case and requirements before choosing an approach.
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