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arr delete: length=0 vs []
(version: 0)
Comparing performance of:
length vs other
Created:
6 years ago
by:
Guest
Go to the latest result
Tests:
length
var arr = [1, 2, 3, 4]; arr.length = 0;
other
var arr = [1, 2, 3, 4]; arr = [];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
length
other
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36 Edg/138.0.0.0
Browser/OS:
Chrome 138 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=614199" width="100%" height="500px"></iframe>
other
235.6M/s
length
52.8M/s
View exact numbers
Test name
Executions per second
✓
other
235,582,736 Ops/sec
length
52,797,072 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in the provided benchmark. **What is being measured?** The test case measures the performance of two different approaches to resetting an array to an empty state: setting `arr.length = 0` or using the assignment operator `arr = []`. **Options compared:** There are two options being compared: 1. **`arr.length = 0`**: This approach sets the length property of the array to 0, effectively reducing its size. 2. **`arr = []`**: This approach reassigns the entire array to a new empty array. **Pros and cons of each approach:** * **`arr.length = 0`**: + Pros: - Generally faster, as it only updates the length property without creating a new array. - Less memory allocation is required. + Cons: - May not work correctly in some older browsers or with certain array implementations (e.g., `ArrayBuffer`). * **`arr = []`**: + Pros: - More straightforward and readable code. - Works consistently across all browsers and array implementations. + Cons: - Generally slower, as it creates a new array object. **Other considerations:** When choosing between these two approaches, consider the specific requirements of your use case. If you need to iterate over the original array elements without modifying the array itself, using `arr = []` might be a better choice. However, if memory efficiency and speed are crucial, setting `arr.length = 0` is likely a better option. **Library usage:** There doesn't seem to be any specific library being used in these test cases. **Special JavaScript features or syntax:** None of the provided benchmark definitions use any special JavaScript features or syntax beyond standard array operations.
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