Benchmark: push vs spread operator

Tests:

push
const tab = [1, 2, 3, 4, 5, 6, 7]; tab.push(8);
spread
const tab = [1, 2, 3, 4, 5, 6, 7]; const tab1 = [...tab, 8];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
push
spread

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 dive into the world of JavaScript microbenchmarks and explain what's tested on MeasureThat.net.

**Benchmark Definition**

The benchmark definition is a simple JavaScript code snippet that defines an array `tab` with some initial values, followed by either the `push()` method or the spread operator (`...`) to add a new element. The goal is to compare the performance of these two approaches:

* `push()`: Appends a new element to the end of the array.
* Spread Operator (`...`): Creates a new array by copying all elements from an existing array and adding one or more new elements.

**Options Compared**

The benchmark compares the performance of these two options:

1. **Push**: The `push()` method adds a new element to the end of the array. This approach has a time complexity of O(1), making it relatively efficient.
2. **Spread Operator**: The spread operator creates a new array by copying all elements from an existing array and adding one or more new elements. This approach also has a time complexity of O(1) for basic cases, but can be slower when dealing with large arrays due to the overhead of creating a new array.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

* **Push**: Pros:
	+ Fast and efficient.
	+ Well-supported in most browsers and engines.
Cons:
	+ May not perform well for very large arrays due to memory allocation.
* **Spread Operator**: Pros:
	+ Creates a new array, which can be beneficial when dealing with large datasets.
Cons:
	+ Slower than `push()` for basic cases.
	+ May have additional overhead due to the creation of a new array.

**Other Considerations**

When choosing between these two approaches, consider the following factors:

* **Array size**: For small arrays (e.g., < 100 elements), both methods are likely to be comparable in performance. For larger arrays (e.g., > 10,000 elements), the spread operator may incur additional overhead.
* **Browser support**: Both methods are widely supported by modern browsers and engines. However, some older browsers or engines might have slightly different behavior.

**Library Usage**

In this benchmark, no external libraries are used.

**Special JS Features or Syntax**

None of these test cases use special JavaScript features or syntax that would require additional explanation.

**Alternatives**

If you're interested in exploring alternative approaches, consider the following:

* **Array.prototype.concat()**: Another way to create a new array by concatenating two arrays. While similar to the spread operator, `concat()` can be slower for large datasets.
* **Object.assign()**: A method to merge one or more source objects into a target object. This approach can also be used to create a new array, but it might incur additional overhead.

Keep in mind that these alternatives are not directly related to the comparison between `push()` and the spread operator, as they represent distinct methods for array manipulation.

Related benchmarks:

push vs spread operator (version: 0)

Comparing performance of: push vs spread

Created: 6 years ago by: Guest

Jump to the latest result

push

spread

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):