Benchmark: arraybench2 - MeasureThat.net

Tests:

first
let array = [10, 0, 0, 20, 1, 0, 12, 2, 0]; for(let i = 0, l = array.length; i < l; i += 3) { console.log(array[i], array[i + 1], array[i + 2]); }
second
let array = [{id:10, x:0, y:0}, {id:20, x:1, y:0}, {id:12, x:2, y:0}]; for(let i = 0, l = array.length, current = null; i < l; ++i) { current = array[i]; console.log(current.id, current.x, current.y); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
first
second

Fastest: N/A

Slowest: N/A

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Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):

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Let's break down the benchmark definition and results.

**Benchmark Purpose**

The purpose of this benchmark is to measure the execution performance of two different JavaScript code patterns: iterating over an array with incrementing indices (Test Case "first") and iterating over an array of objects using a for loop (Test Case "second").

**Test Cases**

We have two test cases:

1. **"first"**: This test case iterates over an array of numbers using a traditional for loop, accessing elements at indices `i`, `i + 1`, and `i + 2`. The array is defined as: `[10, 0, 0, 20, 1, 0, 12, 2, 0]`.
2. **"second"**: This test case iterates over an array of objects using a for loop, accessing properties `id`, `x`, and `y` of each object. The array is defined as: `[ { id:10, x:0, y:0 }, { id:20, x:1, y:0 }, { id:12, x:2, y:0 } ]`.

**Library and Special JS Features**

There are no external libraries used in these test cases. The code uses basic JavaScript features, such as:

* `let` keyword for variable declaration
* Array and object literals
* For loops with incrementing indices
* Property access using dot notation (`current.id`, `current.x`, etc.)

**Options Compared**

We're comparing two different iteration patterns over an array:

1. **Traditional for loop**: Accessing elements at specific indices using `array[i]`.
2. **For loop with object properties**: Accessing properties of objects in an array using `array[i].property`.

**Pros and Cons**

Here are some pros and cons of each approach:

* **Traditional for loop**:
	+ Pros: Simple, efficient, and well-optimized by most JavaScript engines.
	+ Cons: Requires manual index calculation and can be prone to off-by-one errors.
* **For loop with object properties**:
	+ Pros: More readable and maintainable, especially when working with complex objects.
	+ Cons: May incur additional overhead due to property access and dot notation.

**Other Considerations**

When choosing between these two approaches, consider the following:

* The size of your array and the frequency of iteration.
* The complexity of your object properties and their access patterns.
* Your personal preference for code readability and maintainability.

**Alternatives**

If you're looking for alternative ways to iterate over arrays or objects, consider using:

* Array methods like `forEach()`, `map()`, or `reduce()`.
* Modern JavaScript features like `for...of` loops or `Spread syntax` (e.g., `{ ...obj }`).
* External libraries like Lodash or Underscore.js for additional utility functions.

Hope this explanation helps!

Related benchmarks:

arraybench2 (version: 0)

Comparing performance of: first vs second

Created: 4 years ago by: Guest

Jump to the latest result

first

second

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):