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Arr clear
(version: 0)
Comparing performance of:
Asign vs Set length
Created:
one year ago
by:
Guest
Jump to the latest result
Tests:
Asign
const arr1 = [0,1,2,3,4,5,6,7,8,9]; arr1 = [];
Set length
const arr2 = [0,1,2,3,4,5,6,7,8,9]; arr2.length = 0;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Asign
Set length
Fastest:
N/A
Slowest:
N/A
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/126.0.0.0 Safari/537.36
Browser/OS:
Chrome 126 on Mac OS X 10.15.7
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<iframe src="https://measurethat.net/Embed?id=530526" width="100%" height="500px"></iframe>
Test name
Executions per second
Asign
0.0 Ops/sec
Set length
20447732.0 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll explain the benchmark being tested on MeasureThat.net. The provided JSON represents two test cases for JavaScript microbenchmarks: 1. "Arr clear" (not explicitly defined in the benchmark definition, but implied by its name) 2. "Asign" 3. "Set length" **Test Case 1: Arr clear** This test case is likely testing the performance of clearing an array in JavaScript. The `benchmark definition` script sets up an array with values from 0 to 9 and then clears it using the `arr1 = [];` statement. In modern JavaScript, arrays are implemented as dynamic data structures that can be easily resized. Clearing an array involves deallocating its memory and recalculating its length. The performance of this operation depends on various factors, such as: * The browser's garbage collector implementation * The array's initial size and the amount of data being cleared * The presence of other operations or overhead in the script **Test Case 2: Asign** This test case is likely testing the performance of assigning a new value to an element in an array using the bracket notation (`arr[0] = 10;`). The `benchmark definition` script sets up an array with values from 0 to 9 and then assigns the value 10 to its first element. In modern JavaScript, assigning a new value to an array's element involves: * Creating a new object reference for the element * Updating the array's internal pointers or metadata * Possibly triggering garbage collection if the old value is no longer referenced The performance of this operation depends on various factors, such as: * The browser's garbage collector implementation * The array's initial size and the amount of data being assigned to * The presence of other operations or overhead in the script **Test Case 3: Set length** This test case is likely testing the performance of setting an array's length using the `arr2.length = 0;` statement. The `benchmark definition` script sets up an array with values from 0 to 9 and then sets its length to 0. In modern JavaScript, setting an array's length involves: * Deallocating any previously allocated memory for the array * Recalculating the array's capacity or bounds * Possibly triggering garbage collection if the old length is no longer referenced The performance of this operation depends on various factors, such as: * The browser's garbage collector implementation * The array's initial size and the amount of data being cleared * The presence of other operations or overhead in the script **Library usage** None of the provided benchmark definitions explicitly use a JavaScript library. However, some modern browsers have their own optimizations or features that might affect the performance of these tests: * `Map` or `Set` data structures (not used in this benchmark) can provide faster access and modification operations compared to arrays. * `TypedArray`s (e.g., `Int32Array`) might offer better performance for numeric operations. **Special JavaScript features** None of the provided benchmark definitions explicitly use any special JavaScript features, such as: * `let` or `const` declarations * Arrow functions * Promises or async/await However, some modern browsers have their own optimizations or features that might affect the performance of these tests, even if they are not explicitly used in the script.
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