Benchmark: array of objects assign vs push (tiny array)

Script Preparation code:

var arr = [];

Tests:

new object and assign
for(let i=0; i < 10; i++) { arr[i] = { i_val: i, i_val2: i+0.001 }; }
array push object
for(let i=0; i < 10; i++) { arr.push({ i_val: i, i_val2: i+0.001 }); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
new object and assign
array push object

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down what's being tested in this benchmark.

The test is comparing two approaches for adding objects to an array:

1. **Assigning a new object**: In this approach, a new object is created on each iteration of the loop and assigned to the corresponding index in the array using the syntax `arr[i] = { i_val: i, i_val2: i+0.001 }`.
2. **Pushing an object onto the array**: In this approach, a new object is created on each iteration of the loop and pushed onto the end of the array using the syntax `arr.push({ i_val: i, i_val2: i+0.001 })`.

**Comparison**

The benchmark measures the execution time difference between these two approaches.

**Pros and Cons**

* **Assigning a new object**: Pros:
	+ More control over memory allocation (assigning a new object creates a new copy of the object).
	+ Can be more efficient if the array is not fully allocated.
Cons:
	+ Creates multiple objects in memory, which can lead to increased garbage collection overhead.
* **Pushing an object onto the array**: Pros:
	+ More concise and easier to read code.
	+ Push operation is optimized by the browser's engine (it adds the object to a buffer and updates the internal link list).
Cons:
	+ Less control over memory allocation, which can lead to slower performance if the array is not fully allocated.

**Library usage**

None of the test cases use any libraries.

**Special JavaScript features**

This benchmark does not use any special JavaScript features. The code uses standard JavaScript syntax and constructs.

**Other alternatives**

In this specific case, there are no other significant alternatives for adding objects to an array. However, if you were to modify this benchmark to compare different approaches (e.g., using a custom allocator), some alternative implementations could include:

* Using a more efficient data structure, such as a linked list or a vector.
* Implementing a custom allocator that uses memory allocation strategies optimized for performance.
* Using JavaScript's `Array.prototype.map()` method, which can create a new array with the specified transformations (although this would be less efficient than the push operation).

Keep in mind that these alternatives would require significant changes to the benchmark and may not provide direct comparisons with assigning or pushing objects onto an array.

Related benchmarks:

array of objects assign vs push (tiny array) (version: 0)

Adding to array of objects assign vs push

Comparing performance of: new object and assign vs array push object

Created: 3 years ago by: Registered User

Jump to the latest result

new object and assign

array push object

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):