Benchmark: Array.prototype.concat vs spread operator1

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 ]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator

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 definition and explain what is being tested, compared, and considered.

**What is being tested?**

The benchmark compares two approaches for concatenating arrays in JavaScript:

1. **Array.prototype.concat()**: This method creates a new array that contains all elements from both arrays.
2. **Spread operator (...)**: Introduced in ES6, the spread operator allows you to pass multiple arguments to a function or create a new array by spreading existing values.

**What options are compared?**

The benchmark only compares these two approaches for concatenating arrays. There might be other ways to concatenate arrays, such as using the '+' operator or the 'push' method, but they are not being tested in this benchmark.

**Pros and Cons of each approach:**

1. **Array.prototype.concat()**
	* Pros:
		+ Widely supported across browsers.
		+ Easy to read and understand.
	* Cons:
		+ Creates a new array, which can be inefficient for large datasets.
		+ Can lead to performance issues due to the overhead of creating a new object.
2. **Spread operator (...)**
	* Pros:
		+ More concise and readable than using '+' or 'push'.
		+ Reduces the number of operations required.
	* Cons:
		+ Not supported in older browsers.
		+ May lead to performance issues if used incorrectly.

**Library usage:**

There is no library being used in this benchmark. The test cases only involve native JavaScript features.

**Special JS feature/syntax:**

The spread operator (... ) is a new syntax introduced in ES6, which allows you to pass multiple values to a function or create a new array by spreading existing values.

**Other alternatives:**

There are other ways to concatenate arrays in JavaScript, such as using the '+' operator or the 'push' method. For example:

```javascript
// Using '+'
var arr1 = [1, 2];
var arr2 = 'hello';
var merged = arr1 + arr2;

// Using 'push'
var arr1 = [1, 2];
arr1.push('hello');
```

However, these approaches are not being tested in this benchmark.

**Other considerations:**

The benchmark only tests the concatenation of two arrays. In real-world scenarios, you might need to concatenate multiple arrays or handle edge cases, such as null or undefined values.

For more comprehensive benchmarks, it's recommended to test additional scenarios and edge cases to ensure that the results are representative of real-world usage.

Related benchmarks:

Array.prototype.concat vs spread operator1 (version: 0)

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

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

Created: 7 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

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):