Benchmark: SPLICE vs SHIFT - MeasureThat.net

Tests:

Splice
const testArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]; testArray.splice(0, 19);
loop shift
const testArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]; for (let i = 0; i < 19; i++) testArray.shift();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Splice
loop shift

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

The provided benchmark is testing two approaches to remove elements from an array in JavaScript: `splice` and `shift`. We'll break down what's being tested, compare the options, and discuss their pros and cons.

**Tested Options:**

1. **`splice`**: The `splice` method modifies the original array by removing a specified number of elements at a given index (in this case, starting from the beginning).
2. **`loop shift`**: This approach uses a loop to repeatedly remove elements from the end of the array using the `shift()` method.

**Pros and Cons:**

* **`splice`**:
	+ Pros:
		- Efficient in terms of memory usage, as it modifies the original array.
		- Can be faster for large arrays due to its optimized implementation.
	+ Cons:
		- Creates a new array with the modified elements (if you don't specify an index), which can lead to increased memory allocation and garbage collection overhead.
		- May not be suitable for use cases where preserving the original array's structure is crucial.
* **`loop shift`**:
	+ Pros:
		- Preserves the original array's structure, as it only removes elements from the end without modifying the underlying array.
		- Can be useful when working with arrays that need to maintain a specific structure or order.
	+ Cons:
		- Requires more memory allocation and garbage collection overhead due to creating new local variables and iterating over the array.
		- May be slower for large arrays due to the loop and method calls.

**Library:** None of the tested options rely on any external libraries. However, it's worth noting that modern JavaScript engines often have built-in optimizations and micro-optimizations for various array methods, which may affect the results in a benchmarking context.

**Special JS Feature/Syntax:** None mentioned.

Now, let's consider alternative approaches to removing elements from an array:

* **`filter()`**: Instead of `splice` or `shift`, you can use the `filter()` method to create a new array with only the desired elements.
* **`slice()`**: Another approach is to use `slice()` to create a new array with a subset of the original array's elements.
* **Native array methods in older browsers**: If you need to support older browsers, you might consider using native array methods like `splice()`, `shift()`, or `pop()` for compatibility.

Keep in mind that these alternative approaches may have different performance characteristics and trade-offs compared to the tested options. MeasureThat.net's benchmarking framework can help determine which approach is most efficient for a specific use case.

In conclusion, the test case measures the performance difference between two common array manipulation techniques: `splice` and `loop shift`. The results provide valuable insights into the efficiency of each approach in different JavaScript engines and browsers.

Related benchmarks:

SPLICE vs SHIFT (version: 0)

Comparing performance of: Splice vs loop shift

Created: 3 years ago by: Guest

Jump to the latest result

Splice

loop shift

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):