Benchmark: get object vs array key 2

Script Preparation code:

var array = []
var object1 = {}
var object2 = {}

for(var i = 0; i < 1e6; i++) {
    var v = Math.random()
    array[i] = v
    object1[i] = v
    object2[`v${i}`] = v
}

Tests:

array
var sum = 0 for(var i = 1e6 - 1; i >= 0; i--) { sum += array[i] } sum
object
var sum = 0 for(var i = 1e6 - 1; i >= 0; i--) { sum += object1[i] } sum
object with text field
var sum = 0 for(var i = 1e6 - 1; i >= 0; i--) { sum += object2[`v${i}`] } sum
object with concat
var sum = 0 for(var i = 1e6 - 1; i >= 0; i--) { sum += object2['v' + i] } sum

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array
object
object with text field
object with concat

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.125 Safari/537.36

Browser/OS: Chrome 84 on Linux

View result in a separate tab

Test name	Executions per second
array	9.8 Ops/sec
object	8.2 Ops/sec
object with text field	1.5 Ops/sec
object with concat	1.6 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark definition provides the script preparation code for each test case. In this case, we have four test cases:

1. **Array**: A simple array of 1 million elements is created using `var array = []`. The script then iterates over the array to calculate the sum of its elements.
2. **Object**: An object named `object1` and another named `object2` are created, each with a single property (`i`) that increments from 0 to 999999 (1 million - 1). The script then iterates over both objects to calculate the sum of their properties.
3. **Object with text field**: Similar to the previous object test case, but instead of using the array index as the key, a string prefix is used (`'v' + i`).
4. **Object with concat**: This test case uses the `concat()` method to concatenate strings when accessing the property.

**Options Compared**

The four test cases compare different approaches for accessing elements in an object:

1. **Direct Indexing (Array)**: Using the array index directly (`array[i]`) to access elements.
2. **Object Key (Object)**: Using a string key (`object1[i]` or `object2['v' + i]`) to access properties.
3. **Concatenated Text Field (Object with text field)**: Using a concatenated string prefix (`'v' + i`) when accessing properties.

**Pros and Cons of Each Approach**

Here's a brief summary:

* **Direct Indexing (Array)**:
	+ Pros: Fast, simple, and efficient.
	+ Cons: May not be suitable for large datasets or objects with many keys.
* **Object Key (Object)**:
	+ Pros: More flexible and suitable for objects with many keys. Can also be used when direct indexing is not possible.
	+ Cons: May be slower due to the overhead of string manipulation and key lookups.
* **Concatenated Text Field (Object with text field)**:
	+ Pros: Similar to object key, but uses a concatenated string prefix for faster lookup times.
	+ Cons: Requires careful consideration of the maximum length of the concatenated string.

**Library and Purpose**

There is no library explicitly mentioned in the benchmark definition. However, some libraries may be used indirectly by the browser or the operating system (e.g., `Math.random()`).

**Special JS Feature or Syntax**

The provided benchmark definition does not include any special JavaScript features or syntax that would require specific treatment.

**Other Alternatives**

If you were to modify the benchmark to explore different approaches, some alternatives could be:

1. Using a more efficient data structure (e.g., a `Map` instead of an object).
2. Using a caching mechanism to store previously computed results.
3. Comparing different sorting algorithms for accessing elements in an array.
4. Exploring the use of JavaScript primitives (e.g., `number`) vs. objects with properties.

Please note that these alternatives would require significant changes to the benchmark definition and script preparation code, which might not be feasible within the provided constraints.

Related benchmarks:

get object vs array key 2 (version: 0)

Comparing performance of: array vs object vs object with text field vs object with concat

Created: 4 years ago by: Guest

Jump to the latest result

array

object

object with text field

object with concat

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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