Benchmark: shift vs pop with more cases

Tests:

Shift
var n = 0; var t = []; while(true) { t[n] = n; n++; if(n==1000) break; } n = 0; while(true){ n++; t.shift(); if(n==1000) break; }
Pop
var n = 0; var t = []; while(true) { t[n] = n; n++; if(n==1000) break; } n = 0; while(true){ n++; t.pop(); if(n==1000) break; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Shift
Pop

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

**Benchmark Explanation**

The provided benchmark measures the performance difference between two JavaScript array operations: `shift()` and `pop()`. The test cases create an array of length 1000, fills it with numbers from 0 to 999, and then repeatedly performs either `shift()` or `pop()` on the array until it reaches a certain limit.

**Options Compared**

The benchmark compares two options:

1. **Shift**: This operation removes and returns the first element from the end of the array.
2. **Pop**: This operation removes and returns the last element from the array.

**Pros and Cons of Each Approach**

* **Shift:**
	+ Pros:
		- May be more cache-friendly, as it accesses elements from the end of the array, which is often in a faster cache location.
	+ Cons:
		- Can lead to more frequent reallocations of the internal array buffer, which can incur additional overhead.
* **Pop:**
	+ Pros:
		- Less likely to cause reallocations, as it only removes elements from the end of the array.
	+ Cons:
		- May be slower due to cache misses, as it accesses elements from the beginning of the array.

**Library and Purpose**

The benchmark uses a JavaScript library called `Edg` ( likely Edge browser), which is not explicitly mentioned in the benchmark definition. However, based on the provided results, it appears that the test runs on Chrome 102, so it's likely an Edge browser variant that tests its performance with Chrome's JavaScript engine.

**Special JS Feature or Syntax**

There are no special features or syntax used in this benchmark.

**Other Alternatives**

If you're interested in exploring alternative approaches, consider the following:

* **Splice**: Instead of `shift()` or `pop()`, the test could use `splice()` with an offset of 1 to remove and return the last element from the array.
* **Array.prototype.forEach()`: The test could use `forEach()` to iterate over the array, skipping each element, instead of using `shift()` or `pop()`.
* **Native WebAssembly (WASM) implementation**: Depending on your target platform and performance requirements, you might consider implementing the benchmark using a native WASM implementation, which can provide significant performance benefits.

Keep in mind that these alternatives would likely require modifying the test cases and script preparation code to accommodate the new approach.

Related benchmarks:

shift vs pop with more cases (version: 0)

Comparing performance of: Shift vs Pop

Created: 6 years ago by: Guest

Jump to the latest result

Shift

Pop

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):