Benchmark: Boolean vs !! fork

Script Preparation code:

var emptyStr = '';
var str = 'str';
var nl = null;
var undfnd = undefined;
var zero = 0;
var num = 100;

Tests:

!!emptyStr
!!emptyStr
!!str
!!str
!!null
!!nl
!!undefined
!!undfnd
!!0
!!zero
!!num
!!num
Boolean(emptyStr)
Boolean(emptyStr)
Boolean(str)
Boolean(str)
Boolean(null)
Boolean(nl)
Boolean(undefined)
Boolean(undfnd)
Boolean(0)
Boolean(zero)
Boolean(num)
Boolean(num)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
!!emptyStr
!!str
!!null
!!undefined
!!0
!!num
Boolean(emptyStr)
Boolean(str)
Boolean(null)
Boolean(undefined)
Boolean(0)
Boolean(num)

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Measuring the performance of JavaScript code is essential to understand how different approaches impact execution speed. The provided JSON data represents two types of tests: Boolean tests and Boolean expressions with variables.

**Boolean Tests**

The first type of test compares the performance of two approaches:

1. `!!value` (double negation) vs
2. `Boolean(value)` (using the built-in `Boolean()` function)

In JavaScript, `!!value` is a common idiom for converting a value to a boolean. It works by first converting the value to a number (if it's not already a boolean), and then applying the logical NOT operator (`!`) twice.

The `Boolean(value)` approach uses the built-in `Boolean()` function, which converts its argument to a boolean value.

**Performance Comparison**

In general, `!!value` is faster than `Boolean(value)` because it avoids the overhead of a separate function call. However, the difference in performance may not be significant for most use cases.

**Variables in Boolean Expressions**

The second type of test compares the performance of two approaches:

1. `!!variable` (double negation) vs
2. `Boolean(variable)` (using the built-in `Boolean()` function)

In this case, variables are used to make the expressions more complex and representative of real-world scenarios.

**Performance Comparison**

Similar to the Boolean tests, `!!variable` is generally faster than `Boolean(variable)` because it avoids the overhead of a separate function call. However, the difference in performance may be less noticeable with variables involved.

**Key Takeaways**

1. Double negation (`!!value`) is often faster than using the built-in `Boolean()` function.
2. The difference in performance between these approaches may not be significant for most use cases.
3. Variables can make a difference in performance, but the effect is likely to be smaller compared to the Boolean tests.

It's essential to note that these results are specific to this particular test case and may not generalize to other scenarios or JavaScript versions. Additionally, other factors like code optimization, caching, and environment-specific differences can impact performance.

In general, when optimizing performance-critical code, it's always a good idea to profile your application and measure the actual performance impacts of different approaches.

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/119.0.0.0 Safari/537.36

Browser/OS: Chrome 119 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
!!emptyStr	36131640.0 Ops/sec
!!str	33557052.0 Ops/sec
!!null	35916212.0 Ops/sec
!!undefined	36453216.0 Ops/sec
!!0	35948856.0 Ops/sec
!!num	36228792.0 Ops/sec
Boolean(emptyStr)	12654229.0 Ops/sec
Boolean(str)	12626233.0 Ops/sec
Boolean(null)	12595537.0 Ops/sec
Boolean(undefined)	12490717.0 Ops/sec
Boolean(0)	12533720.0 Ops/sec
Boolean(num)	12003357.0 Ops/sec

Related benchmarks:

Boolean vs !! fork (version: 0)

Comparing performance of: !!emptyStr vs !!str vs !!null vs !!undefined vs !!0 vs !!num vs Boolean(emptyStr) vs Boolean(str) vs Boolean(null) vs Boolean(undefined) vs Boolean(0) vs Boolean(num)

Created: one year ago by: Guest

Jump to the latest result

!!emptyStr

!!str

!!null

!!undefined

!!0

!!num

Boolean(emptyStr)

Boolean(str)

Boolean(null)

Boolean(undefined)

Boolean(0)

Boolean(num)

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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