Benchmark: Array.prototype.concat vs Array.push

Tests:

Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
Array.push
const other = [1, 2]; other.push("hello", true, 7);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator
Array.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 provided benchmark and explain what is being tested, compared, and their pros and cons.

**What is being tested?**

MeasureThat.net is comparing three different ways to concatenate arrays in JavaScript:

1. `Array.prototype.concat()`
2. The new ES6 spread operator (`...`)
3. `Array.push()` with multiple arguments

These are the core methods used for array concatenation, which can have varying performance characteristics depending on the browser and device.

**Options compared:**

* **`Array.prototype.concat()`**: This method is a traditional way of concatenating arrays in JavaScript. It creates a new array by copying the elements from both arrays.
* **The spread operator (`...`)**: Introduced in ES6, this operator allows for more concise syntax when creating arrays. Instead of `concat()`, you can use `...` to expand an array and combine it with another array.
* **`Array.push()` with multiple arguments**: While `push()` is primarily used for adding a single element to the end of an array, some browsers (like Chrome) support passing multiple arguments to `push()`. This allows for a more concise way of concatenating arrays.

**Pros and Cons:**

* **`Array.prototype.concat()`**:
	+ Pros: Well-established syntax, easy to understand, and widely supported.
	+ Cons: Can be slower than other methods due to the overhead of creating a new array.
* **The spread operator (`...`)**:
	+ Pros: Concise syntax, can lead to less memory allocation (since it avoids creating a new array).
	+ Cons: May not be as well-supported in older browsers or versions of JavaScript. Can also lead to unexpected behavior if not used correctly.
* **`Array.push()` with multiple arguments**:
	+ Pros: Concise syntax and potentially faster execution due to fewer allocations.
	+ Cons: Less intuitive than other methods, may not work consistently across all browsers.

**Library usage:**

None of the benchmark cases explicitly use any external libraries. The `concat()` method is a standard Array prototype function, while the spread operator and `push()` with multiple arguments are syntax-specific features built into JavaScript.

**Special JS feature or syntax:**

The benchmark uses ES6 syntax (spread operator) that may not be supported in older versions of JavaScript or browsers.

**Alternative approaches:**

Other methods for array concatenation include:

* Using `Array.prototype.reduce()` to concatenate arrays
* Creating an intermediate array and then using `Array.prototype.concat()`
* Using a library like Lodash, which provides a more concise way to concatenate arrays

Keep in mind that these alternatives might not be as efficient or well-supported as the methods being compared.

I hope this explanation helps software engineers understand the benchmark and its various aspects!

Related benchmarks:

Array.prototype.concat vs Array.push (version: 0)

Compare the new ES6 spread operator with the traditional concat() method

Comparing performance of: Array.prototype.concat vs spread operator vs Array.push

Created: 7 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Array.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):