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boolean-vs-number
(version: 0)
compare !!number and number
Comparing performance of:
!!data vs data
Created:
2 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var data = 5;
Tests:
!!data
const result = !!data && 'olala';
data
const result = data && 'olala';
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
!!data
data
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36
Browser/OS:
Chrome 122 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=516531" width="100%" height="500px"></iframe>
data
29.5M/s
!!data
29.5M/s
View exact numbers
Test name
Executions per second
✓
data
29,511,604 Ops/sec
!!data
29,471,148 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Measuring the performance of JavaScript code is crucial in ensuring that our applications run efficiently and effectively. Let's break down the provided benchmark definition and test cases to understand what is being tested: **Benchmark Definition** The benchmark definition specifies two different tests: 1. `!!data` : This test checks the performance of a simple negation operator (`!!`) applied to the variable `data`. 2. `data` : This test checks the performance of direct access to the variable `data`. **Script Preparation Code and Html Preparation Code** The script preparation code is set to `"var data = 5;"`, which assigns a value of 5 to the variable `data`. There is no html preparation code provided. Now, let's analyze the options being compared: **Option 1: Negation Operator (`!!`)** In modern JavaScript, the negation operator (`!!`) can be used to coerce a value to a boolean. This means that if the value is falsey (e.g., `0`, `""`, `null`, etc.), it will be coerced to true, and if it's truthy, it will remain unchanged. The pros of using the negation operator are: * Simplified code: It eliminates the need for explicit conditional statements. * Performance: The negation operator is often optimized by modern JavaScript engines. However, there are some potential drawbacks: * Readability: Some developers may find the `!!` notation less readable than traditional boolean checks (`if (value)`). * Browser support: While most modern browsers support the `!!` operator, older versions might not.
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