Benchmark: chumlamual - MeasureThat.net

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

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

I'll explain the benchmark results and options compared.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON represents a benchmark with three individual test cases: `Array.prototype.concat`, `spread operator`, and `Push`.

**Options Compared**

The benchmark compares different approaches for each test case:

1.  **`Array.prototype.concat()`**:
    *   Option A: Concatenating two arrays using the dot notation (`[1,2].concat([ "hello", true, 7 ])`).
    *   Option B: Using the spread operator (`[1,2,...[ "hello", true, 7 ]]`).
    *   **Pros and Cons**:
        *   Option A: This approach is more readable and intuitive, as it explicitly concatenates two arrays. However, it may incur higher overhead due to the dot notation.
        *   Option B: The spread operator (`...`) is a modern JavaScript feature that provides a concise way to concatenate arrays. It's generally faster than the dot notation but may be less readable for some developers.
2.  **`spread operator()`**:
    *   Option A: Using the spread operator with array destructuring (`[1,2,...[ "hello", true, 7 ]]`)
    *   Option B: The original approach using the spread operator without destructuring (`[1,2].concat([ "hello", true, 7 ])`)
        *   **Pros and Cons**:
            *   Option A: This approach takes advantage of array destructuring, which can improve performance. However, it may be less readable for developers unfamiliar with this syntax.
            *   Option B: The original spread operator approach is more concise and readable but may incur slightly higher overhead due to the extra layer of indirection.
3.  **`Push()`**:
    *   Option A: Using `forEach` loop (`params.forEach((item) => {\r\n\tother.push(item);\r\n});`)
    *   Option B: Using a `for` loop or a `map` function
        *   **Pros and Cons**:
            *   Option A: This approach is simple and readable, but it can be slower than the other options due to the overhead of the `forEach` method.
            *   Option B: The `for` loop or `map` function approaches are generally faster but may require more code and be less readable.

**Libraries Used**

None of the provided benchmark test cases rely on external libraries. They only use built-in JavaScript features and standard library functions.

**Special JS Features/Syntax**

The spread operator (`...`) is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). It provides a concise way to concatenate arrays and objects. While it's supported by most modern browsers, older versions may not execute this syntax correctly or at all.

**Other Alternatives**

If you're looking for alternative approaches or want to experiment with different scenarios:

1.  **Use `slice()` instead of `concat()`**: Instead of using `concat()`, you can use the `slice()` method to create a shallow copy of an array.
    ```javascript
var other = [1,2].slice().concat([ "hello", true, 7 ]);
```
2.  **Use `reduce()` instead of `forEach`/`push`**: The `reduce()` method can be used to accumulate elements in an array, making it a potential alternative to the `forEach` loop and `push` operation.
    ```javascript
var other = [1,2].reduce((acc, item) => acc.concat(item), []);
other.push([ "hello", true, 7 ]);
```
3.  **Use `Array.prototype.flat()` instead of `concat/spread`**: The `flat()` method is a relatively new addition to the Array prototype that provides a concise way to flatten arrays and objects.
    ```javascript
var other = [1,2].flat().concat([ "hello", true, 7 ]);
```

Related benchmarks:

chumlamual (version: 0)

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

Created: 3 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):