Benchmark: spread vs push - simple3

Tests:

spread
var arr = []; new Array(5).fill(1).forEach((item) => { arr = [...arr, item] })
push
var arr = []; new Array(5).fill(1).forEach((item) => { arr.push(item) })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread
push

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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Let's break down the benchmark and its various components.

**What is being tested?**

The benchmark compares two approaches for adding elements to an array in JavaScript: using `Array.prototype.push()` and using the spread operator (`...`) with the `Array.prototype.fill()` method. The test creates an empty array, fills it with 5 elements, and then adds each element to the array using either approach.

**Options being compared**

The two options being compared are:

1. **`push()`**: This is a method on the Array prototype that appends one or more elements to the end of an array. It modifies the original array.
2. **Spread operator (`...`) with `fill()`**: This creates a new array filled with the specified number of elements, and then spreads those elements into the original array.

**Pros and cons of each approach**

**`push()`**:

Pros:

* Efficient, as it modifies the original array in-place
* May be faster due to less overhead compared to creating a new array

Cons:

* Modifies the original array, which may not be desirable in all situations (e.g., when working with immutable data structures)
* Can lead to unexpected behavior if not used carefully

**Spread operator (`...`) with `fill()`**:

Pros:

* Creates a new array, which can be useful for preserving the original array's state
* May be more predictable and easier to understand than using `push()`

Cons:

* More overhead compared to `push()`, as it creates a new array and then spreads elements into it
* May be slower due to additional memory allocation and copying

**Other considerations**

When choosing between these two approaches, consider the trade-offs between performance, predictability, and code readability. If you're working with large datasets or need to preserve the original array's state, `push()` might be a better choice. However, if you prioritize predictability and ease of understanding, using the spread operator with `fill()` could be a better fit.

**Library usage**

There is no library being used in this benchmark.

**Special JS features/syntax**

The benchmark uses modern JavaScript syntax, including:

* The arrow function syntax (`(item) => { arr = [...arr, item] }`)
* The spread operator syntax (`[...arr, item]`)

If you're not familiar with these features, don't worry! They are widely supported in modern browsers and Node.js environments.

**Alternatives**

Other alternatives for adding elements to an array include:

* `Array.prototype.splice()`: This method replaces a section of the array with new elements and returns the removed elements.
* `Array.prototype.concat()`: This method creates a new array by concatenating two or more arrays.
* Using `Array.prototype.set()` (in modern browsers): This method sets all elements in an array to a specified value.

Keep in mind that each approach has its own trade-offs, and the choice of which one to use depends on the specific requirements of your project.

Related benchmarks:

spread vs push - simple3 (version: 0)

Comparing performance of: spread vs push

Created: 4 years ago by: Guest

Jump to the latest result

spread

push

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):