Benchmark: Array concat vs spread operator vs push (forEach2)

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 ]
Push
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ]; params.forEach((item) => { other.push(item); });

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

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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 JSON benchmark definition and test cases.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark that compares three different approaches for concatenating or adding elements to an array:

1.  **Array.prototype.concat()**: This is a traditional method in JavaScript for merging two arrays into a new array.
2.  **Spread Operator (`...`)**: The spread operator is a new feature introduced in ES6 that allows you to expand an array (or object) and create a new one by including all the elements from the original array.
3.  **Push() method**: This method adds one or more elements to the end of an array.

**Options Compared**

The benchmark compares these three approaches:

*   **Array.prototype.concat()**: This traditional method uses the `concat()` function on the `Array` prototype, which creates a new array and returns it.
*   **Spread Operator (`...`)**: This approach spreads all elements from the `params` array into the `other` array, creating a new array.
*   **Push() method**: In this approach, each element in `params` is pushed to the `other` array using the `push()` function.

**Pros and Cons**

Here's an overview of the pros and cons for each approach:

*   **Array.prototype.concat()**:
    *   Pros: Efficient for small arrays; simple syntax.
    *   Cons: Creates a new array, which can lead to increased memory usage. It also involves function calls and returns a value, affecting performance due to overhead.
*   **Spread Operator (`...`)**:
    *   Pros: Native support in JavaScript, efficient for large datasets; easy to read and understand.
    *   Cons: Requires ES6+ support (non-standard); can lead to unexpected behavior if not used carefully.

**Library Usage**

None of the provided test cases use any external libraries beyond the built-in `Array.prototype`.

**Special JS Features or Syntax**

No special JavaScript features or syntax are used in these test cases. The focus is on demonstrating and comparing different approaches for array manipulation.

**Other Alternatives**

For similar use cases, other alternatives might include:

*   Using the `Array.from()` method to create a new array.
*   Utilizing libraries like Lodash that provide an efficient concatenation function (e.g., `lodash.concat()`) or utility functions (`lodash.unary()`).
*   Implementing custom, optimized functions for specific scenarios.

These alternatives might offer better performance, readability, or maintainability in certain contexts, depending on the requirements of your application.

Related benchmarks:

Array concat vs spread operator vs push (forEach2) (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: 5 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Push

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):