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length = 0 vs reassignment
(version: 0)
Comparing performance of:
Set length to 0 vs Reassign the array
Created:
3 years ago
by:
Guest
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Tests:
Set length to 0
const arr = []; for (let i = 0; i < 10000; i++) { for (let j = 0; j < 100; j++) { arr.push(i); } arr.length = 0; };
Reassign the array
let arr = []; for (let i = 0; i < 10000; i++) { for (let j = 0; j < 100; j++) { arr.push(i); } arr = []; };
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
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Test case name
Result
Set length to 0
Reassign the array
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
The provided JSON represents a JavaScript microbenchmark test case on the MeasureThat.net website. The benchmark is designed to compare two approaches for resetting an array in JavaScript: setting its length to 0 versus reassigning it using the assignment operator. **Benchmark Definition** The benchmark definition specifies the following: * Two test cases: * "Set length to 0": This test case creates an array, pushes 10,000 elements into it, and then sets its length to 0. * "Reassign the array": This test case is similar to the previous one but uses the assignment operator `arr = []` instead of setting the length to 0. **Options Compared** The benchmark compares two approaches for resetting an array: 1. **Setting the length to 0**: This method involves using the `length` property of the array object to reset its size. 2. **Reassigning the array**: This method involves reassigning the array variable itself to a new empty array, effectively replacing it with a fresh instance. **Pros and Cons** Here are some pros and cons of each approach: * **Setting the length to 0** * Pros: * Can be more efficient in terms of memory usage since it doesn't create a new object. * Can be faster because it's a simple property access operation. * Cons: * May not work correctly in all environments (e.g., older browsers). * **Reassigning the array** * Pros: * Works consistently across different environments. * Creates a new object, which can be beneficial for garbage collection. * Cons: * Can be less efficient in terms of memory usage since it creates a new object. * May be slower due to the assignment operation. **Library and Special JS Features** There is no library used in this benchmark. However, the test cases do utilize JavaScript's built-in `Array` prototype and its methods (e.g., `push`, `length`). No special JavaScript features are mentioned in the benchmark definition or individual test cases. **Alternatives** If you're interested in exploring alternative approaches for resetting an array, here are a few options: * **Using `splice()`**: Instead of setting the length to 0 or reassigning the array, you could use `splice(0, arr.length)` to remove all elements from the array. This method is more efficient than creating a new array but may not be suitable for all use cases. * **Using `concat()```**: Another approach is to concatenate an empty array with the original one using `arr = arr.concat([])`. However, this method creates a new object and may have performance implications. These alternatives can be used in different scenarios depending on your specific requirements and constraints.
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