Benchmark: mybencmark11500 - MeasureThat.net

Tests:

1
var arr = []; for (let i = 0; i < 10e6; ++i) { arr.push(i); }
2
var arr2 = []; arr2.length = 10e6; for (let i = 0; i < 10e6; ++i) { arr2[i] = i; }
3
var arr3 = new Array(100000); for (let i = 0; i < 10e6; ++i) { arr3[i] = i; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2
3

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

**Benchmark Explanation**

MeasureThat.net is designed to test the performance of different JavaScript arrays in various scenarios. The provided benchmark consists of three individual test cases, each creating an array and performing a specific operation on it.

**Test Case 1:**

```javascript
var arr = [];
for (let i = 0; i < 10e6; ++i) {
    arr.push(i);
}
```

In this test case, an empty array is created using the `[]` syntax. The loop then pushes 1 million elements onto the array. This test case exercises the **array push** operation.

**Test Case 2:**

```javascript
var arr2 = [];
arr2.length = 10e6;
for (let i = 0; i < 10e6; ++i) {
    arr2[i] = i;
}
```

In this test case, an array is created with a fixed length of 1 million elements using the `length` property. The loop then assigns each element from 0 to 999,999 to its corresponding index in the array. This test case exercises the **array assignment** operation.

**Test Case 3:**

```javascript
var arr3 = new Array(100000);
for (let i = 0; i < 10e6; ++i) {
    arr3[i] = i;
}
```

In this test case, an array is created using the `new Array()` constructor with a fixed length of 100,000 elements. The loop then assigns each element from 0 to 999,999 to its corresponding index in the array. This test case exercises the **array constructor** operation.

**Comparison of Options**

The three test cases compare the performance of different JavaScript array operations:

1.  Array push: Creating an empty array and pushing elements onto it.
2.  Array assignment: Creating an array with a fixed length and assigning values to its elements.
3.  Array constructor: Creating an array using the `new Array()` constructor.

**Pros and Cons**

*   **Array Push:**
    *   Pros:
        *   Less memory allocation overhead compared to creating a new array with a fixed length.
        *   More flexible, as you can push any number of elements onto the array.
    *   Cons:
        *   May lead to more memory fragmentation and slower performance due to frequent reallocations.
*   **Array Assignment:**
    *   Pros:
        *   Less memory allocation overhead compared to creating a new array with a fixed length.
        *   Can be faster for large arrays, as it avoids the need for repeated push operations.
    *   Cons:
        *   Requires knowing the exact number of elements in advance, which may not always be possible.
*   **Array Constructor:**
    *   Pros:
        *   More efficient than array push or assignment for large arrays, as it only requires a single allocation.
    *   Cons:
        *   Less flexible, as you must specify the exact length of the array.

**Library and Syntax Considerations**

In this benchmark, no libraries are used. However, if a library were to be used, it might impact the performance results.

**Special JS Features or Syntax**

None of the provided test cases utilize any special JavaScript features or syntax beyond what's standard in JavaScript.

**Alternative Benchmarks**

MeasureThat.net offers various alternative benchmarks for comparing different JavaScript engines and scenarios. Some examples include:

*   **Array creation with dynamic lengths:** This benchmark tests how different browsers handle array creation with variable lengths.
*   **Array iteration performance:** This benchmark compares the performance of different browser's array iteration methods, such as `forEach`, `map`, and `filter`.
*   **Object creation performance:** This benchmark measures how quickly different browsers can create objects using constructors.

Related benchmarks:

mybencmark11500 (version: 0)

sdasdas

Comparing performance of: 1 vs 2 vs 3

Created: 2 years ago by: Guest

Jump to the latest result

1

2

3

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):