Benchmark: test1 array concat vs spred

Script Preparation code:

var params = ["hello", true, 7];

Tests:

spred
var other = [ 1, 2, ...params ]
concat
var other = [1, 2].concat(params);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spred
concat

Fastest: N/A

Slowest: N/A

Latest run results:

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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.

**Benchmark Definition**

The benchmark definition is represented by a JSON object, which includes the following information:

* `Name`: The name of the benchmark, "test1 array concat vs spread".
* `Description`: An empty string, indicating that there is no detailed description for this benchmark.
* `Script Preparation Code`: A JavaScript code snippet that initializes an array called `params` with three values: a string `"hello"`, a boolean `true`, and an integer `7`. This code is executed before running each test case to set up the input data.
* `Html Preparation Code`: An empty string, indicating that no HTML preparation code is required for this benchmark.

**Test Cases**

There are two individual test cases:

1. **spred**: The first test case uses the spread operator (`...`) to create a new array from the `params` array. This syntax is used to expand an array into multiple elements.
2. **concat**: The second test case uses the `concat()` method to concatenate the `params` array with an existing array `[1, 2]`.

**Options Compared**

The benchmark compares two different approaches for creating a new array from the input data:

* **spred**: Using the spread operator (`...`) to create a new array.
* **concat**: Using the `concat()` method to concatenate the input data with an existing array.

**Pros and Cons of Each Approach**

* **spred (Spread Operator)**:
	+ Pros:
		- More concise and expressive syntax.
		- Can be faster, as it avoids the overhead of function calls and method invocations.
	+ Cons:
		- May not work as expected if `params` is an array with a complex structure.
		- Some older browsers or engines may have issues with this syntax.
* **concat**:
	+ Pros:
		- Works in all browsers and engines, even those that support the spread operator but haven't optimized it yet.
		- Can be useful when working with existing codebases that use `concat()`.
	+ Cons:
		- More verbose syntax compared to `spred`.
		- May incur additional overhead due to method invocations and function calls.

**Libraries and Special Features**

There is no explicit library used in the benchmark definition. However, it's worth noting that the spread operator (`...`) was introduced in ECMAScript 2015 (ES6) as a part of the standardization process. The `concat()` method has been available since ES5.

**Other Alternatives**

If you need to create a new array from an existing one without using the spread operator or `concat()`, there are alternative approaches:

* Using `Array.prototype.slice()` and assigning the result to a new variable: `var other = Array.prototype.slice.call(params);`
* Using `Array.prototype.map()` with a callback function: `var other = params.map(function(item) { return item; });`
* Using a library like Lodash (if you're interested in using a utility library)

Related benchmarks:

test1 array concat vs spred (version: 0)

Comparing performance of: spred vs concat

Created: 5 years ago by: Guest

Jump to the latest result

spred

concat

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):