Benchmark: add items to arr

Script Preparation code:

var arr = [{a: "a"},{b: "b"},{c: "c"},{d: "d"},{e: "e"},{f: "f"},{g: "g"},{h: "h"},{i: "i"}];
var arr2 = [{v: "v"},{n: "n"},{m: "m"},{k: "k"},{o: "o"},{p: "p"},{u: "u"},{q: "q"},{s: "s"}];

Tests:

push
arr.push(...arr2);
concat
arr = arr.concat(arr2)
spread
arr = [...arr, ...arr2]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
push
concat
spread

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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I'll break down the provided JSON and explain what's being tested, compared, and considered.

**Benchmark Definition**

The benchmark definition is a JavaScript code snippet that defines two arrays, `arr` and `arr2`, and performs different operations on them: `push`, `concat`, and `spread`. These operations are used to add items from `arr2` to `arr`.

**Script Preparation Code**

This code creates two array literals:

* `var arr = [{a: "a"}, {b: "b"}, {c: "c"}, {d: "d"}, {e: "e"}, {f: "f"}, {g: "g"}, {h: "h"}, {i: "i"}];`
* `var arr2 = [{v: "v"}, {n: "n"}, {m: "m"}, {k: "k"}, {o: "o"}, {p: "p"}, {u: "u"}, {q: "q"}, {s: "s"}];`

**Html Preparation Code**

This code is empty, which means that no HTML code is being generated for the benchmark.

**Individual Test Cases**

The test cases are defined in an array of objects, each containing:

* `Benchmark Definition`: a JavaScript code snippet that performs one of the operations on the two arrays.
* `Test Name`: a unique name for each test case (e.g., "push").

The three test cases compare the performance of the following operations:

1. **push**: `arr.push(...arr2);`
	* This operation uses the spread operator (`...`) to add all elements from `arr2` to `arr`.
	* Pros: concise and efficient.
	* Cons: may not be supported in older browsers or environments.
2. **concat**: `arr = arr.concat(arr2);`
	* This operation uses the `concat()` method to concatenate `arr` with `arr2`.
	* Pros: widely supported, easy to understand.
	* Cons: may incur additional overhead due to function call and object creation.
3. **spread**: `arr = [...arr, ...arr2];`
	* This operation uses the spread operator (`...`) to add all elements from `arr` and `arr2` to a new array.
	* Pros: concise and efficient, modern syntax.
	* Cons: may not be supported in older browsers or environments.

**Library**

There is no library explicitly mentioned in the provided code. However, some libraries (e.g., Lodash) provide similar functionality for array manipulation.

**Special JS Features/Syntax**

The benchmark uses the spread operator (`...`), which was introduced in ECMAScript 2015 (ES6). This syntax allows for concise and efficient array creation and concatenation.

**Other Alternatives**

If the `push`, `concat`, or `spread` methods are not supported, alternative approaches could be:

* Using a loop to manually iterate over `arr2` and add its elements to `arr`.
* Using the `slice()` method to create a new array from `arr` and then using the spread operator (`...`) to concatenate it with `arr2`.

Keep in mind that these alternatives may incur additional overhead or be less efficient than the original methods.

Related benchmarks:

add items to arr (version: 0)

Comparing performance of: push vs concat vs spread

Created: 4 years ago by: Guest

Jump to the latest result

push

concat

spread

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):