Benchmark: map length - MeasureThat.net

Tests:

check each time
var map = new Map() for (let i = 0; i < 10000; i++) { if( map.size > 5000) { map = new Map() } map.set(i, Math.random()) }
check once
var map = new Map() for (let i = 0; i < 10000; i++) { map.set(i, Math.random()) } if( map.size > 5000) { map = new Map() }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
check each time
check once

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36 Edg/95.0.1020.40

Browser/OS: Chrome 95 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
check each time	505.9 Ops/sec
check once	506.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**What is being tested?**

MeasureThat.net is testing the performance of JavaScript's `Map` data structure, specifically how it handles resizing and adding elements. The benchmark defines two test cases:

1. "check each time": This test case creates a new `Map` every 5000 iterations.
2. "check once": This test case creates a single `Map` with 10000 elements and then checks its size.

**Options compared**

The two test cases compare the performance of creating and resizing a `Map`:

1. **"check each time"**: Creates a new `Map` every 5000 iterations.
2. **"check once"**: Creates a single `Map` with 10000 elements.

**Pros and cons of each approach**

1. **"check each time"**
	* Pros:
		+ Reduces memory usage by creating a new `Map` every 5000 iterations, which can be beneficial for systems with limited memory.
	* Cons:
		+ May result in more overhead due to the repeated creation and resizing of the map.
2. **"check once"**
	* Pros:
		+ Reduces overhead by only creating a single `Map` and checking its size.
	* Cons:
		+ Increases memory usage since the same `Map` is used for 10000 iterations.

**Library and purpose**

There is no library explicitly mentioned in the benchmark definition. However, JavaScript's built-in `Map` data structure is being tested.

**Special JS feature or syntax**

None are mentioned specifically.

**Other alternatives**

To measure the performance of `Map`, other approaches could be considered:

1. **Creating an array and using `Object.assign()` to resize**: Instead of creating a new `Map`, you could create an array and use `Object.assign()` to add elements, resizing the array as needed.
2. **Using a custom data structure**: Depending on the specific requirements, a custom data structure like a doubly-linked list or a binary search tree could be used to measure performance.
3. **Benchmarking with other libraries or frameworks**: Measure the performance of `Map` using different libraries or frameworks, such as React or Angular, to see how they optimize and handle resizing.

Keep in mind that these alternatives would require modifying the benchmark definition and may not directly compare to the original test cases.

Related benchmarks:

map length (version: 0)

Comparing performance of: check each time vs check once

Created: 3 years ago by: Guest

Jump to the latest result

check each time

check once

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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