Benchmark: for loop vs splice

Script Preparation code:

var arr = [1, 2, 3, 4, 5];

Tests:

for loop
let newArr = []; for (let i = 0; i < arr.length; i++) { if (!(i == 3)) newArr.push(arr[i]); }
splice
let newArr = arr.slice(); newArr.splice(3, 1);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for loop
splice

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's being tested, compared options, pros and cons of each approach, and other considerations.

**Benchmark Definition**

The benchmark is defined in two parts:

1. A general `Script Preparation Code` that sets up an array `arr` with five elements: `[1, 2, 3, 4, 5]`.
2. Two specific `Benchmark Definitions` for each test case:
	* "for loop" uses a traditional `for` loop to iterate over the array and push elements to a new array `newArr`, excluding element 3.
	* "splice" uses the `Array.prototype.splice()` method to remove the third element from the original array `arr` and assign it to a new array `newArr`.

**Options Compared**

The benchmark is comparing two approaches:

1. **Traditional For Loop**: The first test case uses a traditional `for` loop to iterate over the array, excluding element 3.
2. **Array.prototype.splice()**: The second test case uses the `Array.prototype.splice()` method to remove the third element from the original array and assign it to a new array.

**Pros and Cons of Each Approach**

1. **Traditional For Loop**
	* Pros:
		+ Can be more intuitive for developers familiar with traditional loops.
		+ Allows for direct access to the array elements through the index variable `i`.
	* Cons:
		+ Can be slower due to the overhead of incrementing the loop counter and checking the condition.
2. **Array.prototype.splice()**
	* Pros:
		+ Can be faster since it uses an optimized internal implementation that avoids the overhead of a traditional loop.
		+ Allows for removing elements from the array without modifying the original data structure.
	* Cons:
		+ Requires familiarity with the `Array.prototype` methods and can be less intuitive for developers new to JavaScript.

**Library Usage**

Neither test case uses any external libraries. The `splice()` method is a built-in JavaScript method that operates on arrays.

**Special JS Features or Syntax**

None of the benchmark test cases use special JavaScript features or syntax, such as ES6 classes, async/await, or Promises.

**Other Considerations**

When writing benchmarks, it's essential to consider factors like:

* **Code size and complexity**: The size and complexity of the code being tested can significantly impact execution time.
* **Array size**: Larger arrays tend to be slower due to increased memory access patterns.
* **Browser differences**: Different browsers may have varying performance characteristics for specific methods or features.

**Alternatives**

If you're looking for alternative benchmarks, here are a few ideas:

1. Array concatenation vs. `push()` vs. `unshift()`
2. Object creation (e.g., using `Object.create()` vs. `{}` literal)
3. String manipulation (e.g., concatenation vs. template literals)
4. DOM manipulation (e.g., appending elements to a container vs. inserting children)

When creating benchmarks, consider what you're trying to measure and choose test cases that accurately reflect the scenarios you want to compare.

Related benchmarks:

for loop vs splice (version: 0)

Comparing performance of: for loop vs splice

Created: 6 years ago by: Guest

Jump to the latest result

for loop

splice

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):