Benchmark: Array concat vs spread operator vs push for strings

Tests:

Array.prototype.concat
var params = [ "hello", "true", "aaaaa" ]; var other = [ "hello", "hello" ].concat(params);
spread operator
var params = [ "hello", "true", "aaaaa" ]; var other = [ "hello", "hello", ...params ]
Push
var params = [ "hello", "true", "aaaaa" ]; var other = [ "hello", "hello" ].push(...params);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator
Push

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36

Browser/OS: Chrome 83 on Linux

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	7333169.5 Ops/sec
spread operator	32131322.0 Ops/sec
Push	25155052.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Let's dive into the benchmark.

**What is being tested?**

The provided JSON represents a JavaScript microbenchmark that compares three different approaches to concatenate an array of strings: `concat()`, the spread operator (`...`), and `push()`.

**Options compared:**

1. **Array.prototype.concat**: The traditional method for concatenating arrays in JavaScript.
2. **Spread operator (`...`)**: A new ES6 feature that allows spreading the elements of an array into a new array.
3. **Push():** The `push()` method is used to add one or more elements to the end of an array.

**Pros and Cons of each approach:**

1. **Array.prototype.concat**:
	* Pros:
		+ Well-established and widely supported.
		+ Easy to understand for beginners.
	* Cons:
		+ Can be slower than other methods due to the overhead of creating a new array.
		+ May not be suitable for large datasets or performance-critical applications.
2. **Spread operator (`...`)**:
	* Pros:
		+ Fast and efficient, as it avoids the overhead of creating a new array.
		+ Modern and supported by most browsers.
	* Cons:
		+ Less well-established than `concat()`, which may make it harder to understand for beginners.
		+ Only works with arrays, not other data structures like strings or objects.
3. **Push():**
	* Pros:
		+ Flexible and can be used with any data structure that supports the `push()` method (e.g., arrays, strings).
		+ Can be faster than `concat()` for large datasets.
	* Cons:
		+ Less readable and more verbose than `concat()`, as it requires chaining multiple `push()` calls.

**Library/Functionality usage:**

None of these options rely on any external libraries or built-in functions, so they are self-contained and easy to understand.

**Special JS feature/syntax:**

The spread operator (`...`) is a new ES6 feature that allows spreading the elements of an array into a new array. This syntax was introduced in ECMAScript 2015 (ES6) and has since been widely adopted by modern browsers.

**Other alternatives:**

For large datasets or performance-critical applications, other approaches like `Array.prototype.reduce()` or using a library like Lodash's `flatten` function might be more suitable. However, for small to medium-sized arrays or general-purpose concatenation, the options compared in this benchmark are likely sufficient.

I hope this explanation helps!

Related benchmarks:

Array concat vs spread operator vs push for strings (version: 0)

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

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

Created: 4 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):