Toggle navigation
MeasureThat
.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
parseInt vs Number vs implicit conversion
(version: 0)
Comparing performance of:
Implicit conversion vs parseInt vs Number
Created:
4 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var intA = 42.034; var strB = "42.034";
Tests:
Implicit conversion
var res = intA + +strB;
parseInt
var res = parseInt(intA) + parseInt(strB);
Number
var res = Number(intA) + Number(strB);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
Fork
Test case name
Result
Implicit conversion
parseInt
Number
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36
Browser/OS:
Chrome 136 on Mac OS X 10.15.7
View result in a separate tab
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=603069" width="100%" height="500px"></iframe>
Implicit conversion
242.6M/s
Number
237.6M/s
parseInt
161.2M/s
View exact numbers
Test name
Executions per second
✓
Implicit conversion
242,620,880 Ops/sec
Number
237,572,816 Ops/sec
parseInt
161,231,424 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested. **Benchmark Overview** The benchmark measures the performance of three different approaches to perform implicit conversions in JavaScript: 1. Using the `+` operator (also known as "implicit conversion" or "type coercion"). 2. Using the `parseInt()` function. 3. Using the `Number()` function. **Test Case Explanation** Each test case is a separate benchmark that tests one of these three approaches. The input variables are: * `intA`: an integer literal (`42.034`) * `strB`: a string literal containing a decimal number (`"42.034"`) The output variable, `res`, is the sum of the two inputs. **Implicit Conversion (Test Case 1)** This test case uses the `+` operator to concatenate and implicitly convert the string to a number. The JavaScript engine will attempt to convert the string "42.034" to a decimal number behind the scenes. Pros: * Simple and easy to implement. * Works well for most cases, as the JavaScript engine is capable of handling implicit conversions. Cons: * Can lead to unexpected behavior if the input string has leading zeros or other formatting that affects its interpretation as a number. * May be slower due to the overhead of type coercion. **parseInt() (Test Case 2)** This test case uses the `parseInt()` function to explicitly convert the integer literal to an integer. The second argument is set to `10`, which means the conversion will be base-10 (decimal). Pros: * Provides explicit control over the conversion process. * Can handle edge cases more accurately, as it allows the developer to specify the radix. Cons: * Requires additional function calls and arguments, which can add overhead. * May not work well for all input types or formats. **Number() (Test Case 3)** This test case uses the `Number()` function to explicitly convert the string literal to a decimal number. This is similar to using `parseInt()`, but it allows the conversion to be base-10 by default. Pros: * Simplifies the conversion process compared to `parseInt()`. * Works well for most cases, as the JavaScript engine can handle implicit conversions. Cons: * May not provide explicit control over the conversion process. * Can lead to unexpected behavior if the input string has leading zeros or other formatting that affects its interpretation as a number. **Library Considerations** None of the test cases use any external libraries. **Special JS Feature/Syntax** The benchmark uses the `+` operator for implicit conversions, which is a built-in JavaScript feature. The `parseInt()` and `Number()` functions are also standard JavaScript functions. **Other Alternatives** If you want to explore alternative approaches, here are some additional options: * Using `parseFloat()` instead of `+` or `parseInt()` for floating-point numbers. * Using regular expressions (e.g., `\d+(\.\d+)?`) to extract numeric values from strings. * Using a dedicated library like `lodash` or `moment.js` for string manipulation and conversion. These alternatives can provide more flexibility, control, or performance in specific use cases, but may also introduce additional overhead or complexity.
Related benchmarks
parseInt vs Number addition
parseInt vs Number parsing
parseInt vs Number mult
Comments
Confirm delete:
Do you really want to delete benchmark?