Benchmark: Array.prototype.concat vs spread operator

Tests:

Array.prototype.push.apply(arr, params)
var arr = [ 1, 2, "world" ]; var params = [ "hello", true, 7 ]; Array.prototype.push.apply(arr, params);
arr.push(...params)
var arr = [ 1, 2, "world" ]; var params = [ "hello", true, 7 ]; arr.push(...params);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.push.apply(arr, params)
arr.push(...params)

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 test cases to understand what's being tested.

**Benchmark Definition:**
The benchmark is designed to compare two approaches for concatenating arrays in JavaScript:

1. Using `Array.prototype.push.apply(arr, params)`: This method applies an array (`params`) to another array (`arr`) using the `push` method.
2. Using the spread operator (`...`) with the `push` method: This method uses the spread operator to concatenate the elements of two arrays.

**Options Compared:**
The benchmark is comparing the performance of these two approaches, which have different syntax and behaviors:

1. **Traditional Concatenation**: `Array.prototype.push.apply(arr, params)` is a more verbose approach that uses the `apply` method to call the `push` method on the array.
2. **Spread Operator**: `arr.push(...params)` is a newer, more concise approach that uses the spread operator to create a new array with concatenated elements.

**Pros and Cons:**
Here are some pros and cons of each approach:

* Traditional Concatenation (`Array.prototype.push.apply(arr, params)`):
	+ Pros:
		- Wide browser support (no ES6 syntax required)
		- Can be more flexible for complex concatenations
	+ Cons:
		- Verbose syntax
		- May not be as efficient due to the use of `apply`
* Spread Operator (`arr.push(...params)`):
	+ Pros:
		- Concise syntax
		- More readable and expressive
		- Efficient, as it avoids the overhead of `push.apply()`
	+ Cons:
		- Requires ES6 or later syntax support
		- May not work in older browsers

**Library:**
There is no explicit library used in these benchmark definitions. However, it's worth noting that some JavaScript environments (e.g., Node.js) may have additional libraries or implementations that could affect the performance of these approaches.

**Special JS Features/Syntax:**
The spread operator (`...`) is a new syntax introduced in ECMAScript 2015 (ES6). It allows for concise array creation and manipulation. The `apply()` method, on the other hand, is an older way to invoke a function with specific arguments.

**Other Considerations:**

* **Browser Support:** The benchmark assumes that all tested browsers support the latest versions of Chrome and are running on Windows.
* **Device Platform:** The test results do not account for variations in device performance or architecture. Different devices may have different effects on execution speed due to factors like CPU, memory, and caching.

**Alternatives:**
Other alternatives for concatenating arrays could include:

1. Using `Array.prototype.concat()`: This method creates a new array with the elements of the original array and one or more additional arrays.
2. Using an array polyfill: Some libraries (e.g., Lodash) provide implementations of older array methods, including `push.apply()`.

Keep in mind that these alternatives may have different performance characteristics, syntax requirements, and compatibility issues depending on the specific use case and target environment.

Related benchmarks:

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

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

Comparing performance of: Array.prototype.push.apply(arr, params) vs arr.push(...params)

Created: 8 years ago by: Guest

Jump to the latest result

Array.prototype.push.apply(arr, params)

arr.push(...params)

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):