Benchmark: for loop length vs length+1

Tests:

Set in the loop
const dump=[]; const end=100000; for(var i=0; i<end; i++){ dump.push(i); }
set after the loop
const dump=[]; const end=99999; for(var i=0; i<end+1; i++){ dump.push(i); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Set in the loop
set after the loop

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Windows

View result in a separate tab

Test name	Executions per second
Set in the loop	589.1 Ops/sec
set after the loop	599.9 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested in the provided JSON.

**Benchmark Overview**

The benchmark is designed to compare two approaches for assigning values to an array `dump` inside a `for` loop:

1. **Set in the loop**: The value is assigned directly within the loop condition (`i < end`).
2. **Set after the loop**: The value is assigned outside the loop, after the loop has completed.

**Options Compared**

The two options are being compared to determine which one is faster and more efficient.

**Pros and Cons of Each Approach**

1. **Set in the loop**:
	* Pros: Reduced overhead for array push operations since it's done within the loop.
	* Cons: Potential performance impact due to increased number of loop iterations (due to the condition `i < end`).
2. **Set after the loop**:
	* Pros: Simplified loop logic, reduced overhead due to fewer loop iterations.
	* Cons: Increased overhead for array push operations since it's done outside the loop.

**Library and Special JS Features**

In this benchmark, no libraries are explicitly mentioned or used. However, some special JavaScript features are being utilized:

* **Variable `i`**: A common variable name in JavaScript, used to iterate over a range of values.
* **Array push**: Used to add elements to the `dump` array.

**Other Considerations**

When evaluating these two approaches, it's essential to consider factors such as:

* Loop iteration count: The number of times the loop runs affects performance. In this case, the first approach might run more iterations due to the condition `i < end`.
* Array push overhead: The cost of pushing elements to an array can be significant. By doing it within the loop (approach 1), the overhead is reduced.

**Alternatives**

Other approaches that could be considered for benchmarking array assignment in a loop include:

* Using a different data structure, like `splice()` or `unshift()`, instead of `push()`.
* Implementing a custom iterator or generator function to assign values to the array.
* Comparing performance using other programming languages or frameworks.

Keep in mind that the specific approach and language used can significantly impact the results. This benchmark is designed to test JavaScript-specific aspects, but exploring alternative approaches can provide valuable insights into optimization strategies.

Related benchmarks:

for loop length vs length+1 (version: 0)

Comparing performance of: Set in the loop vs set after the loop

Created: 2 years ago by: Guest

Jump to the latest result

Set in the loop

set after the loop

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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