Benchmark: State Scope vs Global

Tests:

using this
function session () { this.config = Object.create(null); this.observers = Object.create(null); this.memory = Object.create(null); this.selectors = Object.create(null); this.pages = Object.create(null); this.snapshots = Object.create(null); this.tracked = new Set(); return this; } const state = session() state.pages['foo'] = 'bar' state.tracked.add('foo')
global
const observers = Object.create(null); const memory = Object.create(null); const selectors = Object.create(null); const pages = Object.create(null); const snapshots = Object.create(null); const tracked = new Set(); pages.foo = 'bar' tracked.add('foo')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
using this
global

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

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**Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON represents two individual test cases, which are part of a benchmark named "State Scope vs Global". This explanation will help you understand what's being tested in these test cases.

**Test Cases**

There are two test cases:

1. **"using this"`**: This test case defines a function `session` that returns an object with several properties: `config`, `observers`, `memory`, `selectors`, `pages`, `snapshots`, and `tracked`. The `tracked` property is a Set that keeps track of the objects being tracked.
The test case then creates a new instance of this session function, `state = session()`, and assigns it to the `foo` property of the `pages` object. Finally, it adds the string `'bar'` to the `tracked` set.

2. **"global"`**: This test case defines several variables: `observers`, `memory`, `selectors`, `pages`, `snapshots`, and `tracked`. These variables are created using the `Object.create(null)` method, which creates an object with no prototype.
The test case then assigns a value to the `foo` property of the `pages` object and adds the string `'bar'` to the `tracked` set.

**Options Compared**

These two test cases compare two different approaches:

1. **Using the `this` keyword**: In the "using this" test case, the `session` function returns an object with properties that are bound to the current execution context using the `this` keyword.
2. **Global variables**: In the "global" test case, the variables are created using the `Object.create(null)` method, which creates an object in the global scope.

**Pros and Cons**

**Using the `this` keyword:**

Pros:

* Provides a way to create objects with properties that are scoped to the current execution context.
* Can be useful for creating objects that need to access specific variables or functions from the surrounding scope.

Cons:

* Can lead to tighter coupling between the object's properties and the surrounding code.
* May cause issues when the object is passed around or used in different contexts.

**Global Variables:**

Pros:

* Creates an object in the global scope, which can be useful for accessing external variables or functions.
* Allows for more flexibility when working with objects that need to access external resources.

Cons:

* Can lead to global variable pollution and make code harder to understand.
* May cause issues when the object is passed around or used in different contexts.

**Other Considerations**

Both test cases create objects using the `Object.create(null)` method, which creates an object with no prototype. This can be useful for creating objects that need to access specific variables or functions from the surrounding scope.

**Library Usage**

None of the provided test cases use any external libraries.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax used in these test cases. They only use standard JavaScript syntax and features.

**Alternative Approaches**

Other alternatives to compare could include:

* Using a different scoping mechanism, such as closures or bind()
* Creating objects using different constructors (e.g., `Object.create()`, `new` keyword)
* Comparing object property access patterns (e.g., dot notation vs bracket notation)

Note that the choice of approach ultimately depends on the specific requirements and constraints of the project.

Related benchmarks:

State Scope vs Global (version: 0)

Comparing performance of: using this vs global

Created: 4 years ago by: Registered User

Jump to the latest result

using this

global

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):