Benchmark: Spread vs Oneliner vs Split Liner

Script Preparation code:

var array = Array.from({ length: 10000 }).map((val, i) => i);

Tests:

Spread
array.splice(99, 1)[0] var newArray = [99, ...array];
Oneliner
var newArray = array.unshift(array.splice(99, 1)[0]);
Splitliner
array.splice(99, 1); var newArray = array.unshift(99);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread
Oneliner
Splitliner

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 benchmark and its test cases.

**Benchmark Purpose**

The purpose of this benchmark is to compare the performance of three different approaches for manipulating an array in JavaScript:

1. Spreading an element onto an array using the spread operator (`...`).
2. Using a one-liner expression to achieve the same result.
3. Splitting and unshifting elements onto an array.

**Options Compared**

The benchmark compares the performance of these three approaches on different input sizes (not explicitly specified in this example, but implied by the script preparation code).

**Pros and Cons of Each Approach**

1. **Spread Operator (`...`)**:
	* Pros: concise, readable, and efficient.
	* Cons: may lead to slower execution due to the overhead of creating a new array or modifying an existing one (depending on the browser's implementation).
2. **One-Liner Expression**:
	* Pros: often optimized by browsers for performance, as it can be executed in a single step.
	* Cons: may be less readable and maintainable than other approaches.
3. **Splitting and Unshifting Elements**:
	* Pros: allows for explicit control over the array's contents and can lead to better cache locality.
	* Cons: generally slower due to the overhead of creating new arrays, modifying existing ones, or handling edge cases.

**Libraries and Special JavaScript Features**

In this benchmark, there are no libraries used. However, it does utilize special JavaScript features:

1. **Template Literals (`\r\n`)**: used in some test cases for formatting purposes.
2. **Array Splicing and Unshifting**: used to manipulate the array.

**Other Alternatives**

For similar benchmarks, you might consider testing other approaches, such as:

* Using `Array.prototype.slice()` or `Array.prototype.concat()` instead of the spread operator.
* Utilizing more advanced JavaScript features like `Map` or `Set` for array-like data structures.
* Measuring performance on different types of input data (e.g., numbers, strings, objects).
* Examining the impact of browser optimizations or caching on performance.

Keep in mind that the specifics of these alternatives will depend on the benchmark's goals and requirements.

Related benchmarks:

Spread vs Oneliner vs Split Liner (version: 0)

Comparing performance of: Spread vs Oneliner vs Splitliner

Created: 3 years ago by: Guest

Jump to the latest result

Spread

Oneliner

Splitliner

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):