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Implicit vs parseInt vs Number string to num vs pipe
(version: 0)
Comparing performance of:
implicit vs parseInt vs Number vs Pipe
Created:
3 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var strNum = '6969699'
Tests:
implicit
var imp = + strNum
parseInt
var toStr = parseInt(strNum)
Number
var num = Number(strNum)
Pipe
var num = strNum|0
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
implicit
parseInt
Number
Pipe
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and its test cases. **Benchmark Definition** The benchmark is designed to compare four different ways of converting a string to a number: 1. Implicit conversion using unary plus (`+`) 2. Using `parseInt()` with no arguments 3. Using the built-in `Number` function 4. Using the pipe operator (`|`) for integer division **Options Compared** Each test case measures the execution speed of one of these options. * **Implicit Conversion**: Uses unary plus to convert the string to a number. + Pros: Simple, no additional libraries required. + Cons: May lead to NaN (Not a Number) if the input string is not a valid number. * **parseInt()**: Uses the `parseInt()` function with no arguments to convert the string to an integer. + Pros: More robust than implicit conversion, handles whitespace and leading zeros. + Cons: Can be slower due to the function call overhead. * **Number**: Uses the built-in `Number` function to convert the string to a number. + Pros: Simple, no additional libraries required. Can handle decimal numbers. + Cons: May lead to NaN if the input string is not a valid number. * **Pipe Operator**: Uses the pipe operator (`|`) for integer division to convert the string to an integer. + Pros: Simple, no additional libraries required. Fast and efficient. + Cons: Assumes that the decimal point should be ignored and that leading zeros are not significant. **Library Usage** There is no explicit library usage in these test cases. However, some browsers may have their own implementations of `parseInt()` or `Number` functions that might affect the results. **Special JavaScript Feature** The use of the pipe operator (`|`) for integer division is a special feature that was introduced in ECMAScript 2015 (ES6). It allows dividing two numbers using the `/` operator and discarding the remainder. In this benchmark, it's used to convert a string to an integer. **Other Considerations** * The use of `var imp = + strNum` assumes that the input string can be converted to a number without errors. If the input string contains invalid characters, this will result in NaN. * The use of `parseInt()` and `Number` functions is more robust than implicit conversion because they can handle whitespace, leading zeros, and invalid input strings. **Alternative Approaches** Other approaches for converting a string to an integer include: 1. Using a regular expression with the `match()` method: `strNum.match(/^\d+$/) && +strNum` 2. Using a library like Lodash or Moment.js 3. Using a third-party conversion function, such as the `convertStringToInt` function from the `string-int` module. These alternatives might offer better performance, robustness, or flexibility, but they may also introduce additional dependencies and complexity.
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