Benchmark: reduce with slice

Script Preparation code:

var list = Array.from(Array(1000).keys());

Tests:

reduce with if
var nonzero = list.reduce((prev, item, index) => { if (!index) { return [item]; } return prev.concat(item); }, []);
reduce with slice
var nonzero = list.slice(1).reduce((prev, item, index) => { return prev.concat(item); }, [list[0]]);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
reduce with if
reduce with slice

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.

The provided JSON represents two benchmark definitions for testing the performance of reducing an array using either the `slice()` method or a conditional statement (`if`).

**Benchmark Definitions**

There are two test cases:

1. **"reduce with if"`**: This benchmark definition uses a traditional `if` statement to check if the current index is zero (i.e., the first element in the array). If it's not zero, the function concatenates the new item to the accumulator.
2. **"reduce with slice"`**: This benchmark definition uses the `slice()` method to create a new array containing all elements except the first one. Then, it applies the same reduction logic as before.

**Options Compared**

The two approaches are compared in terms of their performance on the specified test cases. The results will show which approach is faster for each test case.

**Pros and Cons of Each Approach:**

1. **"reduce with if"`**:
	* Pros: Easy to understand, straightforward logic.
	* Cons: May be slower due to the conditional statement, potential branch prediction issues.
2. **"reduce with slice"`**:
	* Pros: Potential for better performance due to optimized `slice()` method implementation, reduced branching.
	* Cons: May be harder to understand, requires knowledge of array manipulation techniques.

**Other Considerations**

When comparing these two approaches, it's essential to consider the following factors:

* Array size and distribution (e.g., random vs. sequential elements).
* Browser/JavaScript engine support for optimized `slice()` method implementation.
* Potential impact of branch prediction on performance.

**Library/Function Used:**

The `reduce()` method is a built-in JavaScript function, which means it's available in all modern browsers. The `slice()` method is also a built-in function, but its implementation might vary depending on the browser or JavaScript engine used.

**Special JS Feature/Syntax:**

There are no specific JavaScript features or syntaxes being tested in these benchmark definitions. However, if you're interested in exploring other microbenchmarks that utilize advanced JavaScript features like async/await, generators, or WebAssembly, I'd be happy to help with those as well!

**Alternative Benchmarks:**

If you're interested in testing alternative approaches for reducing arrays, here are a few examples:

* Using `forEach()` instead of `reduce()`.
* Implementing custom array reduction logic using loops (e.g., `for` loops).
* Utilizing specialized libraries like Lodash or Underscore.js for optimized array manipulation functions.
* Comparing performance with different data structures, such as linked lists or trees.

Related benchmarks:

reduce with slice (version: 0)

Comparing performance of: reduce with if vs reduce with slice

Created: 5 years ago by: Guest

Jump to the latest result

reduce with if

reduce with slice

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):