Benchmark: Create a map once then query it, or query each value.

Script Preparation code:

var arr = [];
var i = 0;

while (i <= 1E5) arr[i] = { id: i++ };

Tests:

Search the array.
let j = 0; while (j <= 1E5) { const item = arr.find(e => e.id == j++); }
Make a map then search.
let myMap = new Map(arr.map(e => ([e.id, e]))); let j = 0; while (j <= 1E5) { const item = myMap.get(j++); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Search the array.
Make a map then search.

Fastest: N/A

Slowest: N/A

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 is being tested in the benchmark.

**Benchmark Definition**

The first part of the JSON represents the overall benchmark definition. Here, we have:

* **Name**: A descriptive name for the benchmark.
* **Description**: A brief explanation of the purpose of the benchmark. In this case, it's about comparing two approaches: searching through a large array directly or using a map data structure to store and retrieve values efficiently.

**Script Preparation Code**

The script preparation code is used to set up the environment before running each test case. Here, we have:

* **Creating an empty array**: `var arr = [];`
* **Initializing a counter variable**: `var i = 0;`
* **Populating the array with data**: The `while` loop populates the array with objects, where each object has an `id` property.

**Html Preparation Code**

There is no HTML preparation code provided in this case.

Now, let's move on to the individual test cases:

**Test Cases**

We have two test cases:

1. **Search the array**: This test case uses a simple `while` loop to iterate through the array and find an item based on its `id` property.
2. **Make a map then search**: This test case creates a map data structure from the array using the `Map` constructor, which maps each element's `id` property to itself.

**Libraries and Features**

In the "Make a map then search" test case, we use the built-in `Map` object in JavaScript. The purpose of this library is to provide a data structure that stores key-value pairs, allowing for efficient lookups by key.

As for special JavaScript features or syntax, there are none mentioned in this benchmark.

**Approaches**

So, what approaches are being compared?

1. **Direct array search**: This approach involves searching through the entire array to find an item based on its `id` property.
2. **Using a map data structure**: This approach creates a map from the array and uses it to look up values by their `id` property.

**Pros and Cons**

Here are some pros and cons of each approach:

* **Direct array search**:
	+ Pros: Simple, easy to implement.
	+ Cons: Can be slow for large datasets due to linear search.
* **Using a map data structure**:
	+ Pros: Efficient lookups, especially for large datasets or frequent searches.
	+ Cons: Requires additional memory and computational resources to create the map.

**Other Considerations**

When designing benchmarks like this one, it's essential to consider factors such as:

* **Dataset size**: The larger the dataset, the more significant the differences between approaches will be.
* **Search patterns**: Are the searches uniform or will they follow a particular pattern? This can affect performance.
* **Hardware and software characteristics**: Different browsers, devices, or environments might exhibit different performance characteristics.

**Alternatives**

If you wanted to create alternative test cases, you could consider:

* Using other data structures like `Set` or `TreeMap`.
* Introducing noise in the search pattern (e.g., randomizing the order of elements).
* Varying the dataset size and composition.
* Adding additional factors that might impact performance, such as sorting or filtering.

By exploring these alternatives, you can gain a deeper understanding of how different approaches affect performance under various scenarios.

Latest run results:

Run details: (Test run date: 3 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36

Browser/OS: Chrome 127 on Windows

View result in a separate tab

Test name	Executions per second
Search the array.	2563.3 Ops/sec
Make a map then search.	106.0 Ops/sec

Related benchmarks:

Create a map once then query it, or query each value. (version: 0)

when receiving a large result, should you query said result and reused the cache value, or should you search the value each time.

Comparing performance of: Search the array. vs Make a map then search.

Created: 3 months ago by: Guest

Jump to the latest result

Search the array.

Make a map then search.

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):