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Implicit vs parseFloat vs Number string to num
(version: 0)
Comparing performance of:
implicit vs parseFloat vs Number
Created:
3 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var strNum = '6969699.1'
Tests:
implicit
var imp = + strNum
parseFloat
var toStr = parseFloat(strNum)
Number
var num = Number(strNum)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
implicit
parseFloat
Number
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:123.0) Gecko/20100101 Firefox/123.0
Browser/OS:
Firefox 123 on Linux
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<iframe src="https://measurethat.net/Embed?id=514648" width="100%" height="500px"></iframe>
implicit
1601.5M/s
Number
1379.8M/s
parseFloat
26.7M/s
View exact numbers
Test name
Executions per second
✓
implicit
1,601,476,480 Ops/sec
Number
1,379,750,016 Ops/sec
parseFloat
26,722,464 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain the benchmark and its various aspects. **Benchmark Definition** The benchmark is designed to measure the performance of three different approaches for converting a string number to a numerical value in JavaScript: implicit conversion, `parseFloat()`, and `Number()`. The test cases use the following script preparation code: ```javascript var strNum = '6969699.1'; ``` This code defines a variable `strNum` with the value `'6969699.1'`, which is a string representation of the decimal number 6,699,690. **Test Cases** There are three test cases: 1. **Implicit Conversion**: The first test case uses implicit conversion to convert the string to a number: ```javascript var imp = + strNum; ``` In JavaScript, the `+` operator is used for both arithmetic and numeric conversions. This means that when the `+` operator encounters a string literal, it attempts to interpret the entire string as a single number. 2. **parseFloat()**: The second test case uses the `parseFloat()` function to convert the string to a floating-point number: ```javascript var toStr = parseFloat(strNum); ``` The `parseFloat()` function is used to parse a string and return a floating-point number. 3. **Number()**: The third test case uses the `Number()` function to convert the string to an integer or float, depending on its value: ```javascript var num = Number(strNum); ``` In JavaScript, the `Number()` function can take two arguments: a single value (which is converted to a number) and a radix argument (which specifies the base of the number in the range 1-36). **Pros and Cons** Here's a brief analysis of each approach: * **Implicit Conversion**: This approach can be faster because it avoids the overhead of a separate function call. However, it may also introduce rounding errors due to the conversion process. + Pros: potentially faster + Cons: may introduce rounding errors * **parseFloat()**: This approach is more explicit and less prone to rounding errors than implicit conversion. However, it may be slower because it involves an additional function call. + Pros: more predictable results + Cons: slower due to extra function call * **Number()**: This approach can convert both integers and floats, but it may also introduce rounding errors if the input string is not a valid integer representation. + Pros: versatile (converts integers and floats) + Cons: may introduce rounding errors **Library** There are no external libraries used in this benchmark. **Special JS Features or Syntax** None of the test cases use any special JavaScript features or syntax beyond what's commonly available in modern browsers. **Other Alternatives** If you were to compare these approaches on a different platform, such as Node.js or a web framework like React Native, you might also consider using other methods like: * **Big.js**: A library for big numbers and decimal arithmetic. * **Decimal.js**: Another library for decimal arithmetic. * **Arbitrary-precision arithmetic libraries** (e.g., `big.js`, `decimal.js`): These libraries can provide more precise control over the conversion process, especially when working with very large or small numbers. However, in general web browsers are unlikely to be a bottleneck for these kinds of conversions, and the differences between these approaches will likely be relatively small.
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