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Should you cache Intl.DateTimeFormat (simple key)?
(version: 1)
Testing creating a new Intl.DateTimeFormat each time vs. caching it using simple string as the key.
Comparing performance of:
No caching vs With simple cache
Created:
2 years ago
by:
Registered User
Go to the latest result
Script Preparation code:
FORMAT = { timeZone: 'Europe/Moscow', day: '2-digit', month: 'short', year: 'numeric' } cache = new Map()
Tests:
No caching
const date = new Intl.DateTimeFormat('en-AU', FORMAT).format(new Date())
With simple cache
const key = FORMAT.timeZone; let formatter = cache.get(key) if (!formatter) { formatter = new Intl.DateTimeFormat('en-AU', FORMAT) cache.set(key, formatter) } const date = formatter.format(new Date())
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
No caching
With simple cache
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
16 days ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36
Browser/OS:
Chrome 150 on Windows
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<iframe src="https://measurethat.net/Embed?id=633263" width="100%" height="500px"></iframe>
With simple cache
2.0M/s
No caching
31K/s
View exact numbers
Test name
Executions per second
✓
With simple cache
1,978,917 Ops/sec
No caching
30,638 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the benchmark and explain what's being tested. **What is being tested?** MeasureThat.net is testing two approaches to creating an `Intl.DateTimeFormat` object: 1. Creating a new instance of `Intl.DateTimeFormat` without caching (also known as "no caching"). 2. Caching instances of `Intl.DateTimeFormat` using a simple string as the key (also known as "with simple cache"). **Options compared** The benchmark is comparing two options: * Option 1: Create a new instance of `Intl.DateTimeFormat` each time it's needed, without storing any instances in memory. * Option 2: Cache instances of `Intl.DateTimeFormat` using a simple string (`FORMAT.timeZone`) as the key. This means that if an instance is created before with the same settings, it will be retrieved from the cache instead of creating a new one. **Pros and cons** Here are some pros and cons of each approach: **No Caching (Option 1)** Pros: * Simple to implement * No memory usage concerns * No potential for stale data or inconsistencies Cons: * Creating a new instance of `Intl.DateTimeFormat` can be slow, especially if the same settings are used frequently. * Memory usage increases linearly with the number of instances created. **With Simple Cache (Option 2)** Pros: * Can improve performance by reusing existing instances * Reduces memory usage compared to Option 1 Cons: * Adds complexity due to caching mechanism * If an instance is not cached, it needs to be created, which can still be slow. * There's a risk of stale data or inconsistencies if the cache is not updated properly. **Other considerations** In this benchmark, MeasureThat.net is using a simple string (`FORMAT.timeZone`) as the key for caching. This approach has some limitations: * If multiple instances with different settings are cached, it may lead to unexpected behavior. * The cache will only work if the same settings are used exactly, including all options (e.g., `day`, `month`, `year`). **Library and its purpose** The `Intl.DateTimeFormat` object is a part of the Internationalization API in JavaScript. Its purpose is to format dates and times according to the user's locale preferences. In this benchmark, the `FORMAT` object defines the settings for the date and time formatting, such as language (`'en-AU'`), timezone (`'Europe/Moscow'`), day format (`'2-digit'`), month format (`'short'`), and year format (`'numeric'`).
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