Benchmark: parseInt vs Number vs Plus addition

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);
Plus
var res = +intA + +strB;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
No conversion
parseInt
Number
Plus

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 9 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser/OS: Chrome 138 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
No conversion	120219440.0 Ops/sec
parseInt	125410440.0 Ops/sec
Number	148070704.0 Ops/sec
Plus	159569168.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**What is tested?**

The benchmark measures the performance of different approaches to perform addition on two variables:

1. `intA` - an integer value
2. `strB` - a string value containing a decimal number

The tests compare the performance of three methods:

a. **No conversion**: directly adding `intA` and `strB`
b. **parseInt**: converting both values to integers using `parseInt()` function
c. **Number**: converting both values to numbers using the `Number()` function
d. **Plus**: using the unary plus operator (`+`) to convert both values to numbers

**Options compared:**

The benchmark compares the performance of these four methods:

1. Direct addition without conversion (`No conversion`)
2. Using `parseInt()` for both conversions (`parseInt`)
3. Using `Number()` for both conversions (`Number`)
4. Using the unary plus operator for both conversions (`Plus`)

**Pros and Cons:**

Here's a brief overview of each method's pros and cons:

a. **No conversion**: This approach is simple and straightforward, but it may lead to unexpected results if the string value is not a valid decimal number.
	* Pros: Simple, fast execution
	* Cons: Potential for errors due to invalid input

b. **parseInt**: Converts both values to integers using `parseInt()`. This method is more predictable than direct addition, but it may have performance implications due to function calls.
	* Pros: Predictable results, easier to maintain
	* Cons: May incur performance overhead due to function calls

c. **Number**: Similar to `parseInt`, converts both values to numbers using the `Number()` function.
	* Pros: More flexible than `parseInt` and allows for decimal numbers
	* Cons: Still may incur performance overhead due to function calls

d. **Plus**: Uses the unary plus operator (`+`) to convert both values to numbers.
	* Pros: Fast execution, minimal function call overhead
	* Cons: May be less readable or maintainable than other approaches

**Library/Function explanations:**

The benchmark uses two built-in JavaScript functions:

1. `parseInt()`: Converts a string to an integer value, ignoring the decimal part if present.
2. `Number()`: Converts a string to a number value.

These functions are widely supported and used in various contexts.

**Special JS feature/syntax:**

There is no special JavaScript feature or syntax mentioned in this benchmark. The tests focus on the performance of different methods for performing arithmetic operations on strings and integers.

**Alternatives:**

If you're looking for alternative approaches, consider the following:

1. **Using a library like moment.js**: For working with dates and numbers, libraries like moment.js can provide more accurate and efficient results.
2. **Implementing a custom parser**: If you have specific requirements or constraints, implementing a custom parser for parsing decimal numbers from strings could be an alternative.
3. **Using other conversion methods**: Depending on the specific use case, you might consider using other conversion methods like `parseFloat()` (floating-point parsing) or `Big.js` for large number parsing.

Keep in mind that these alternatives may have different performance characteristics and trade-offs compared to the original benchmark.

Related benchmarks:

parseInt vs Number vs Plus addition (version: 0)

Comparing performance of: No conversion vs parseInt vs Number vs Plus

Created: 3 years ago by: Guest

Jump to the latest result

No conversion

parseInt

Number

Plus

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):