Benchmark: Concat vs spread for a single value

Script Preparation code:

var param = 3;
var array = [ 1, 2 ]

Tests:

Concat
var result = array.concat(param);
Spread
var result = [ ...array, param ]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
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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**Benchmark Overview**

The benchmark measures the performance difference between two approaches: using `concat()` and using the spread operator (`...`) to concatenate an array with a single value. The script preparation code initializes an array `array` with values `[1, 2]` and a variable `param` with value `3`.

**Options Compared**

There are two options being compared:

1. **Concat**: Using the `concat()` method to concatenate the array `array` with the value `param`.
```javascript
var result = array.concat(param);
```
2. **Spread**: Using the spread operator (`...`) to concatenate the array `array` with the value `param`.
```javascript
var result = [ ...array, param ];
```

**Pros and Cons**

*   **Concat:**
    *   Pros:
        *   Widespread support across browsers and JavaScript engines.
        *   Simple syntax.
    *   Cons:
        *   Performance overhead due to the creation of a new array object.
        *   Inefficient use of memory for large arrays or values.
*   **Spread:**
    *   Pros:
        *   More efficient than `concat()` since it uses a single assignment operation and doesn't create a new array object.
        *   Cleaner syntax in some cases, especially when concatenating multiple elements.
    *   Cons:
        *   Less supported across older browsers and JavaScript engines.
        *   Less intuitive syntax for non-expert users.

**Library and Special JS Features**

There is no explicit library mentioned in the benchmark definition. However, the spread operator (`...`) is a part of the ECMAScript 2015 (ES6) standard, which means it's widely supported across modern browsers and JavaScript engines.

No special JavaScript features or syntax are used in this benchmark. It focuses on comparing two basic approaches to concatenation.

**Alternative Approaches**

If you need to concatenate arrays with different values, other alternatives might include:

*   Using `push()` method: `array.push(param);`
*   Using `slice()` and `concat()` methods together: `array.slice(0).concat(param)`
*   Using a custom implementation using loops or iterative functions

Keep in mind that each of these approaches has its own trade-offs regarding performance, memory usage, and syntax complexity.

**Best Practice Considerations**

When working with arrays and concatenation:

*   Use the spread operator (`...`) when possible for cleaner syntax and better performance.
*   Be mindful of compatibility issues across older browsers and JavaScript engines.
*   Optimize array concatenation operations by minimizing unnecessary allocations and reassignments.

Related benchmarks:

Concat vs spread for a single value (version: 0)

Comparing performance of: Concat vs Spread

Created: 3 years ago by: Guest

Jump to the latest result

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):