Benchmark: localStorage speed vs object field read

Tests:

localStorage getItem
localStorage.setItem('foo', 'bar'); var testObj = { 'foo': 'bar' }; localStorage.getItem('foo');
object field read
localStorage.setItem('foo', 'bar'); var testObj = { 'foo': 'bar' }; testObj.foo

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
localStorage getItem
object field read

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down what's being tested in the provided benchmark.

**Benchmark Definition:**

The main objective of this benchmark is to compare the performance of two different approaches:

1. **Directly accessing an object property:** `var testObj = {\r\n    'foo': 'bar'\r\n};\r\ntestObj.foo`
2. **Using the `localStorage` API to store and retrieve a value associated with a key:** `localStorage.setItem('foo', 'bar');\r\nlocalStorage.getItem('foo')`

**Pros and Cons of each approach:**

* Directly accessing an object property:
	+ Pros: Typically faster, as it involves only a simple property access.
	+ Cons: This approach relies on the object being in memory and accessible directly. If the object is not in scope or has been garbage collected, this will result in a runtime error.
* Using `localStorage` API to store and retrieve a value:
	+ Pros: This approach allows for storing values that persist across page loads and can be accessed even when the original script is not running. However, it involves an additional step of storing and retrieving data from storage, which may incur overhead.
	+ Cons: This approach requires additional resources (storage space) to store the value, and there might be latency due to the time it takes for the value to be retrieved from storage.

**Library/Functionality used in the test case:**

In this benchmark, the `localStorage` API is being used. `localStorage` is a W3C standard API that provides a way to store small amounts of data locally on an end-user's web browser or mobile device. It allows for storing key-value pairs that can be accessed across page loads.

**Special JS feature/syntax:**

There doesn't appear to be any special JavaScript features or syntax being tested in this benchmark, as it only involves basic JavaScript operations such as variable declaration and property access.

**Alternatives:**

Other alternatives for testing the performance of accessing object properties could include:

1. Accessing an array element (e.g., `var arr = [1, 2, 3];\r\narr[0]`)
2. Using a global variable (e.g., `var globalVar = 'bar';\r\nglobalVar`)
3. Creating and accessing a new object using the constructor function (`var newObj = function() {}\r\nnewObj()`)

Similarly, alternatives for testing the performance of using the `localStorage` API could include:

1. Using the `sessionStorage` API instead (which is more suitable for temporary storage)
2. Comparing the performance with other caching mechanisms, such as IndexedDB or Web Storage
3. Creating a mock `localStorage` implementation to simulate its behavior

Related benchmarks:

localStorage speed vs object field read (version: 0)

Comparing performance of: localStorage getItem vs object field read

Created: 3 years ago by: Registered User

Jump to the latest result

localStorage getItem

object field read

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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