Benchmark: Spread operator vs array push

Script Preparation code:

buffer = [];

Tests:

Spread
buffer = [ ...buffer, { foo: 'bar' } ];
Push
buffer.push({ foo: 'bar' });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread
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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Let's break down the provided benchmark and explain what is being tested.

**Benchmark Overview**

The benchmark compares two approaches to append an object to an array in JavaScript: using the spread operator (`...`) and using the `push()` method.

**Script Preparation Code**

The script preparation code initializes an empty array called `buffer`.

**Individual Test Cases**

There are two test cases:

1. **Spread**: The first test case uses the spread operator to append an object with a property `foo` set to `'bar'` to the existing array in `buffer`. This is represented by the JavaScript expression `[ ...buffer, { foo: 'bar' } ]`.
2. **Push**: The second test case uses the `push()` method to append the same object to the end of the array in `buffer`.

**Library Used**

There is no explicit library used in this benchmark.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax explicitly used in these test cases. However, it's worth noting that some browsers may have optimized implementations of these features that could affect the results.

**Options Compared**

The two options being compared are:

1. **Spread Operator**: Using the spread operator to append an object to an array.
2. **Push Method**: Using the `push()` method to append an object to an array.

**Pros and Cons of Each Approach**

* **Spread Operator**:
	+ Pros: Can be more concise and readable in some cases, as it allows for a more declarative syntax.
	+ Cons: May incur additional overhead due to the creation of a new array, which could potentially lead to slower performance.
* **Push Method**:
	+ Pros: More direct and efficient, as it modifies the existing array without creating a new one.
	+ Cons: Can be less readable or more verbose in some cases, especially for complex append operations.

**Other Considerations**

When evaluating these options, it's also worth considering factors such as:

* Array size: How many elements does the array need to hold? For small arrays, the spread operator might incur unnecessary overhead.
* Performance-critical code: In performance-critical code paths, the push method might be preferred for its directness and efficiency.
* Code readability: The choice between the two methods depends on the specific use case. If readability is a concern, the spread operator might be preferable.

**Alternative Approaches**

Other approaches to appending an object to an array in JavaScript include:

1. **Using `concat()`**: Instead of using the spread operator or push method, you can use the `concat()` method to create a new array and then assign it back to the original variable.
2. **Using `Array.prototype.reduce()`**: You can use the `reduce()` method to accumulate elements in an array.

However, these alternatives might not be as efficient or readable as the spread operator or push method, depending on the specific use case.

In summary, this benchmark compares two common approaches to appending an object to an array in JavaScript: using the spread operator and using the `push()` method. The choice between these options depends on factors such as performance requirements, code readability, and array size.

Related benchmarks:

Spread operator vs array push (version: 0)

Comparing performance of: Spread vs Push

Created: 7 years ago by: Guest

Jump to the latest result

Spread

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):