Benchmark: Push one by one vs push arr to alloc array

Tests:

push
let src_arr = [] for (let i = 0; i < 1024; ++i) { src_arr.push(-0) } for (let n = 0; n < 100; ++n) { let arr = [] for (let i = 0; i < 10*1024; ++i) { arr.push(-0) } }
concat
let src_arr = [] for (let i = 0; i < 1024; ++i) { src_arr.push(-0) } for (let n = 0; n < 100; ++n) { let arr = [] for (let i = 0; i < 10; ++i) { arr.push(...src_arr) } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
push
concat

Fastest: N/A

Slowest: N/A

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

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**What is being tested?**

The provided benchmark measures the performance of two approaches to push elements onto an array: `push` and `concat`.

* The `push` approach involves pushing individual elements onto an array using the `push()` method, which allocates a new element on the heap.
* The `concat` approach involves creating a new array by concatenating an existing array (`src_arr`) with another array containing the same elements.

**Options compared**

The benchmark compares two options:

1. **Push one by one**: This approach pushes individual elements onto an array using the `push()` method, which allocates a new element on the heap for each push operation.
2. **Push array to allocated array**: This approach creates a new array with the right allocated size (in this case, 10 times the length of `src_arr`) and then pushes all elements from `src_arr` onto it using the `push()` method.

**Pros and Cons**

* **Push one by one**:
	+ Pros: Simple and easy to implement.
	+ Cons: Allocates multiple elements on the heap for each push operation, leading to increased memory allocation overhead.
* **Push array to allocated array**:
	+ Pros: Reduces memory allocation overhead since a single large array is created beforehand.
	+ Cons: Requires more complex implementation and may not be as efficient in some cases.

**Library usage**

The `push` test case uses the built-in JavaScript `Array.prototype.push()` method, which is a standard part of the ECMAScript specification. The `concat` test case also uses the `Array.prototype.concat()` method, which concatenates two or more arrays into a new array.

**Special JS feature/syntax**

The benchmark does not use any special JavaScript features or syntax that are not widely supported by modern browsers.

**Other alternatives**

There are other approaches to push elements onto an array, such as:

* Using the `set()` method on a Map object, which can be more efficient than pushing individual elements onto an array.
* Using a data structure like a LinkedList, which can provide better performance for certain use cases.

However, these alternatives may not be directly comparable to the `push` and `concat` approaches tested in this benchmark, as they may involve different underlying data structures or implementation details.

Related benchmarks:

Push one by one vs push arr to alloc array (version: 0)

to allocate a array with the right allocated size, which one is the fastest ?

Comparing performance of: push vs concat

Created: 2 years ago by: Guest

Jump to the latest result

push

concat

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):