Benchmark: Compare the new ES6 spread operator with the traditional concat() method

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.js"></script>

Script Preparation code:

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

Tests:

Array.prototype.concat
var result = [ 1, 2 ].concat(params);
spread operator
var result = [ 1, 2, ...params ];
Ramda assoc
const result = R.assoc([1, 2], params);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator
Ramda assoc

Fastest: N/A

Slowest: N/A

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Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

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This benchmark compares three different ways to combine the arrays `[1, 2]` with  `params` which contains `["hello", true, 7]`.  Let's break down each approach:

**1. `Array.prototype.concat()`:**

* **Definition:** This method uses the traditional way of concatenating arrays in JavaScript. The code `[1, 2].concat(params)` creates a new array by joining the elements of `[1, 2]` with those in `params`.
   * **Pros:** Widely understood and supported across all JavaScript engines. Simple to read and implement.
   * **Cons:** Can be slower than newer methods like the spread operator for large arrays due to its iterative nature.

**2. Spread Operator (`...`)**:

* **Definition:** Introduced in ES6, this operator unpacks the elements of an array into individual values within another array literal.  `[1, 2, ...params]` creates a new array with `1`, `2` followed by all the elements from `params`.
   * **Pros:** Concise and readable syntax. Often performs better than `concat()` for large arrays because it's more efficient under the hood.
   * **Cons:** Requires knowledge of ES6 syntax. May not be supported in older browsers (though widespread support exists).

**3. Ramda (`assoc`)**:

* **Definition:** This test case uses a library called Ramda, which specializes in functional programming paradigms. `R.assoc([1, 2], params)` utilizes the `assoc` function to insert `params` into an array at a specific index (determined by `[1, 2]`).
   * **Pros:** Offers powerful functional programming features for manipulating arrays immutably (without changing original data).
   * **Cons:** Introduces external library dependency. Can have a steeper learning curve compared to built-in JavaScript methods.

**Alternatives:**

Besides these three approaches, there are other ways to combine arrays:

* **`.push()` method:** Add elements one by one to an existing array.  
* **`for...of` loop:** Iterate through `params` and manually add each element to a new array.
* **Library-specific functions:** Other libraries besides Ramda might offer specialized array manipulation functions with different performance characteristics.

Let me know if you'd like more details about any specific aspect of these approaches!

Related benchmarks:

Compare the new ES6 spread operator with the traditional concat() method (version: 0)

Comparing performance of: Array.prototype.concat vs spread operator vs Ramda assoc

Created: 8 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Ramda assoc

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):