Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
array.length === 0 vs !array.length
(version: 0)
Comparing performance of:
array.length === 0 vs !array.length
Created:
2 years ago
by:
Guest
Jump to the latest result
Tests:
array.length === 0
const array = []; for (let i = 0; i < 10000; i++) { if (array.length === 0) { // } }
!array.length
const array = []; for (let i = 0; i < 10000; i++) { if (!array.length) { // } }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
array.length === 0
!array.length
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain the benchmark test and its variations. **Benchmark Test Overview** The provided benchmark test is designed to measure the performance difference between two approaches for checking if an empty array has a length of 0: 1. `array.length === 0` 2. `!array.length` This test is useful in JavaScript development, as it can help identify potential optimization opportunities or performance bottlenecks. **Options Compared** The benchmark tests compare the performance of two options: 1. **`array.length === 0`**: This option uses a direct comparison to check if the array has a length of 0. 2. **`!array.length`**: This option uses the negation operator (`!`) to negate the result of `array.length`, effectively checking if the length is 0. **Pros and Cons** Here are some pros and cons of each approach: * `array.length === 0`: + Pros: Simple, readable, and easy to understand. + Cons: May be slower due to the comparison operation. * `!array.length`: + Pros: May be faster due to the negation operator being optimized by the JavaScript engine. + Cons: Less intuitive and may require more explanation to understand. **Library Usage** The test code does not use any external libraries. It only relies on built-in JavaScript features. **Special JS Features or Syntax** There is no special JavaScript feature or syntax used in this benchmark test. **Other Alternatives** If the `!array.length` approach is too hard to read, another alternative could be: * `array.length > 0`: This option checks if the array has a length greater than 0. While it may seem similar to `!array.length`, it's not exactly equivalent, as an empty string would still have a length of 0. However, using `array.length > 0` is generally considered less efficient and less readable than `!array.length`. In summary, the benchmark test is designed to measure the performance difference between two approaches for checking if an empty array has a length of 0. The `!array.length` approach may be faster due to optimization by the JavaScript engine, but it's less intuitive and requires more explanation.
Related benchmarks:
Zero vs One Compare
JS array emptiness check
array[array.length - 1] vs array.at(-1)
Array.from() vs new Array() - empty
Array(length).fill() vs Array.from({ length: length })
Comments
Confirm delete:
Do you really want to delete benchmark?