Benchmark: spread vs push test

Tests:

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

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:

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

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I'll break down the benchmark and explain what's being tested, compared, and the pros and cons of each approach.

**What is being tested?**

The benchmark is comparing two ways to add an object to an array in JavaScript:

1. **Spread operator (ES6)**: The `...` operator is used to create a new array by copying elements from an existing array and adding new elements.
2. **Push method**: The `push()` method is used to add one or more elements to the end of an array.

**Benchmark Definition JSON**

The benchmark definition JSON specifies that:

* There are two test cases: "spread operator" and "Push".
* No script preparation code or HTML preparation code is required for this benchmark.
* The benchmark is comparing the performance of both approaches on a sample input: `var params = [ "hello", true, 7 ]`.

**Options being compared**

The options being compared are:

1. **Spread operator**: Creates a new array by copying elements from an existing array (`params`) and adding a new element (`{test: 'hello'}`).
2. **Push method**: Adds the new object to the end of the original array using `push()`.

**Pros and Cons**

Here's a brief summary of each approach:

* **Spread operator**:
	+ Pros:
		- Creates a new array, which can be more efficient for large datasets.
		- Does not modify the original array.
	+ Cons:
		- Can lead to unnecessary memory allocations if done in a loop.
		- Requires JavaScript version support (introduced in ES6).
* **Push method**:
	+ Pros:
		- Modifies the original array, which can be more efficient for large datasets.
		- Does not create new objects or arrays unnecessarily.
	+ Cons:
		- Can modify the original array, potentially affecting other parts of the code.

**Library and special JS feature**

In this benchmark, no library is used. However, it's worth noting that if a library like Lodash were to be used, it could provide utility functions for working with arrays, including `spread()` or alternative methods.

**Special JS features**

The spread operator (`...`) was introduced in ECMAScript 2015 (ES6) and allows creating new arrays by copying elements from an existing array. The benchmark is specifically testing this feature.

**Other alternatives**

If you needed to add a single element to an array without using the spread operator or `push()`, other alternatives could be:

* `concat()` method: Returns a new array created by concatenating all the elements of an array.
* Array.prototype.slice() and Array.prototype.splice(): These methods can also be used to create new arrays, but they might not be as efficient as the spread operator or `push()`.

Keep in mind that the choice of approach depends on the specific use case and performance requirements.

Related benchmarks:

spread vs push test (version: 0)

Compare the new ES6 spread operator with the traditional push

Comparing performance of: spread operator vs Push

Created: 5 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):