Benchmark: Function override vs assignment

Tests:

Override
class BaseClass { a construct(a) { this.a = a } performTask(b) { return this.a + b; } } class ActualClass extends BaseClass { performTask(b) { return this.a * b; } } const random1 = Math.random() * 50 const random2 = [...Array(100)].map(v => Math.random() * 10) const expectedResult = random2.reduce((acc, cur, i) => acc + ((i % 2) * 2 - 1) * random1 * cur, 0) const instance = new ActualClass(random1) let result = 0 for (i = 0; i < random2.length; ++i) { result += ((i % 2) * 2 - 1) * instance.performTask(random2[i]) } console.log(result == expectedResult)
assignment
class ActualClass2 { a construct(a) { this.a = a } performTask = (a, b) => a + b } const random1 = Math.random() * 50 const random2 = [...Array(100)].map(v => Math.random() * 10) const expectedResult = random2.reduce((acc, cur, i) => acc + ((i % 2) * 2 - 1) * random1 * cur, 0) const instance = new ActualClass2(random1) instance.performTask = (a, b) => a * b let result = 0 for (i = 0; i < random2.length; ++i) { result += ((i % 2) * 2 - 1) * instance.performTask(random2[i]) } console.log(result == expectedResult)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Override
assignment

Fastest: N/A

Slowest: N/A

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

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I'll break down the provided benchmark for you.

**Benchmark Overview**

The benchmark measures the performance difference between two approaches to override the `performTask` method in a JavaScript class: function overriding and assignment.

**Function Overriding vs Assignment**

1. **Function Overriding**
In this approach, the `performTask` method is overridden by creating an instance of the `ActualClass` with the `a` property set to a random value. The `performTask` method is then called on each element of the `random2` array, and the results are accumulated.

Pros:

* Allows for more control over the method's behavior
* Can lead to more efficient execution if the overridden method is optimized

Cons:

* Requires creating an instance of the class before calling the method
* May incur overhead due to object creation and lookup

2. **Assignment**
In this approach, the `performTask` property is assigned a new function that takes two arguments, `a` and `b`. The same instance is used throughout the test, and the `performTask` property is reassigned with a new function after its initial assignment.

Pros:

* Reuses the existing instance without creating a new one
* May be faster due to reduced object creation overhead

Cons:

* Requires explicit reassignment of the `performTask` property for each execution
* May lead to slower performance if the new function is not optimized

**Library: None**

Neither of the test cases relies on any external libraries.

**Special JS Features/Syntax: None**

There are no special JavaScript features or syntax used in these test cases, such as async/await, generators, or decorators.

**Benchmark Preparation Code**

The preparation code for each benchmark is empty, which means that the test cases start from a clean slate without any additional setup or teardown.

**Alternative Approaches**

Other approaches to testing function overriding vs assignment could include:

* Using a mock framework like Jest or MockJS to isolate dependencies and improve testability
* Creating multiple instances of the `ActualClass` for each execution to eliminate instance creation overhead
* Using a different data structure, such as an array of functions, instead of an object with a single property

However, these alternative approaches may not be necessary depending on the specific requirements and goals of the benchmark.

Related benchmarks:

Function override vs assignment (version: 0)

Comparing performance of: Override vs assignment

Created: 3 years ago by: Guest

Jump to the latest result

Override

assignment

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):