Benchmark: Js array test andrei

Script Preparation code:

let arr = [];

Tests:

test 2
let arr = []; for(i=0; i<10; i++){ arr.push(i); }
test 3
let arr = []; for(i=0; i<10; i++){ arr[i] = i; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
test 2
test 3

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

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This benchmark on MeasureThat.net compares two different ways to populate a JavaScript array with numbers from 0 to 9.

**Test Case Descriptions:**

* **Test "test 2":** Uses a `for` loop and the `push()` method to add each number to the end of the array.
   ```javascript
   let arr = []; // initialize an empty array
   for(i=0; i<10; i++){ // iterate from 0 to 9
       arr.push(i); // add the current value 'i' to the end of the array
   }
   ```

* **Test "test 3":** Uses a `for` loop and direct indexing to assign values within the array.
   ```javascript
   let arr = []; 
   for(i=0; i<10; i++){
       arr[i] = i; // assign the current value 'i' at index 'i' in the array
   }
   ```

**Comparison and Considerations:**

* **Performance:** The `push()` method, used in "test 2," is generally considered to be slower than direct indexing. This is because `push()` requires allocating new memory each time an element is added, while direct indexing directly modifies existing elements within the array.
* **Array Memory Allocation:** Direct indexing ("test 3") can potentially lead to more efficient memory allocation as the array's size is known in advance.  `push()` might involve resizing and copying data when the array exceeds its initial capacity.

**Alternatives:**

Besides these methods, JavaScript offers other ways to create arrays:

* **Array constructor with values:** `let arr = new Array(10).fill(i)`
* **Spread syntax:** `let arr = [...Array(10).keys()]` (generates a sequence of numbers)

**Library Usage:** There are no libraries used in these benchmark tests.  The provided code relies solely on built-in JavaScript functionality.

Let me know if you have any more questions!

Related benchmarks:

Js array test andrei (version: 0)

Comparing performance of: test 2 vs test 3

Created: 3 years ago by: Guest

Jump to the latest result

test 2

test 3

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):