Benchmark: zk test spread vs push 2

Tests:

spread operator
var params = [ "hello", true, 7 ]; var other = [...params, {id: 123} ]
Push
var other = [ "hello", true, 7 ].push({id: 123});

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread operator
Push

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

I'd be happy to explain what's being tested in the provided JSON benchmark.

The benchmark is comparing two approaches for creating an array with additional elements: using the spread operator (`...`) and using the `push()` method.

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

In the first test case, the code creates an array `params` with three initial elements: `"hello"`, `true`, and `7`. Then, it uses the spread operator to create a new array `other` that includes all elements from `params` plus an additional object with an `id` property set to `123`. The syntax is:
```javascript
var params = [ "hello", true, 7 ];
var other = [...params, { id: 123 } ];
```
**Push Method (`push()`)**:

In the second test case, the code creates an array `other` with three initial elements: `"hello"`, `true`, and `7`. Then, it uses the `push()` method to add a new object with an `id` property set to `123` to the end of the array. The syntax is:
```javascript
var other = [ "hello", true, 7 ].push({ id: 123 });
```
**Comparison and Pros/Cons**:

The benchmark is interested in comparing the performance of these two approaches.

Pros of using the spread operator (`...`):

* It's a more modern and concise way to create arrays with additional elements.
* It creates a new array, which can be beneficial for large datasets since it avoids mutating the original array.

Cons of using the spread operator (`...`):

* It may incur a performance overhead due to the creation of a new array.
* In older browsers or environments, it might not be supported at all.

Pros of using the `push()` method:

* It's an established and widely-supported way to add elements to an array.
* It can be more efficient for large arrays since it only modifies the existing array.

Cons of using the `push()` method:

* It mutates the original array, which can lead to unintended consequences if the original array is used elsewhere in the code.
* It may incur a performance overhead due to the creation of a new object and its allocation on the heap.

**Other Considerations**:

It's worth noting that in modern JavaScript, both approaches are generally considered equal in terms of performance. The spread operator has become a de facto standard, and most modern browsers and engines optimize it well. However, if you're targeting older environments or specific use cases where performance is critical, the choice between these two approaches might depend on your priorities.

As for other alternatives, there are a few more ways to create arrays with additional elements:

* Using `Array.prototype.concat()`: `var other = [ "hello", true, 7 ].concat({ id: 123 });`
* Using `Array.prototype.push.apply()`: `var other = []; var params = [ "hello", true, 7 ]; other.push.apply(other, params);`

However, these approaches are generally less efficient and more verbose than the spread operator or `push()` method.

**Libraries and Special JS Features**:

There is no specific library mentioned in the benchmark. However, it's worth noting that the spread operator was introduced in ECMAScript 2015 (ES6) as a part of the JavaScript standardization process.

Related benchmarks:

zk test spread vs push 2 (version: 0)

Compare the new ES6 spread operator with the traditional concat() method and push

Comparing performance of: spread operator vs Push

Created: 2 years ago by: Guest

Jump to the latest result

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):