Benchmark: () => this.something() vs this.something.bind(this)

Tests:

() => this.something()
function A() { this.something = function() { console.log(this); }; document.addEventListener('scroll', () => this.something()); } new A();
this.something.bind(this)
function A() { this.something = function() { console.log(this); }; document.addEventListener('scroll', this.something.bind(this)); } new A();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
() => this.something()
this.something.bind(this)

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is being tested.

**What is being tested?**

MeasureThat.net is testing two approaches to invoke the `something` method on an object in JavaScript:

1. **Arrow function notation**: The first test case, `"() => this.something()"`, uses an arrow function to create a new scope for the variable `this`. This approach is equivalent to using a traditional function expression with the same syntax.
2. **Method binding**: The second test case, `"this.something.bind(this)"`, uses the `bind()` method to explicitly set the context (`this`) of the `something` method.

**Options being compared**

The benchmark is comparing the performance of these two approaches in a specific scenario:

* Both tests create an object with a `something` property, which logs the value of `this` to the console when called.
* In both cases, the `document.addEventListener('scroll')` event listener is attached to call the `something` method on each iteration.

**Pros and cons of each approach**

1. **Arrow function notation (`() => this.something()`)**:
	* Pros: concise syntax, creates a new scope for `this`, easier to read.
	* Cons: may lead to unexpected behavior in older browsers that don't support arrow functions.
2. **Method binding (`this.something.bind(this)`)**:
	* Pros: explicit control over the context of the method, works in all browsers supporting JavaScript.
	* Cons: less concise syntax, may be perceived as more verbose.

**Other considerations**

In this specific benchmark, the main difference between the two approaches is how they handle the scope of `this`. In the arrow function notation, the scope of `this` is bound to the local context, whereas in method binding, the context is explicitly set using the `bind()` method. The choice between these approaches depends on personal preference, code readability, and compatibility requirements.

**Library usage**

There are no external libraries used in this benchmark.

**Special JavaScript features or syntax**

There are no special JavaScript features or syntax mentioned in this explanation. However, it's worth noting that MeasureThat.net is a web-based benchmarking tool that focuses on JavaScript performance, so any feature or syntax not related to performance optimization might be ignored.

**Alternative approaches**

Other alternatives for invoking the `something` method include:

* Using an explicit function expression with `this` set explicitly: `function() { this.something(); }`
* Using a class constructor to create the object: `class MyClass { constructor() { this.something = function() { console.log(this); }; } }`

These alternatives would not be included in the benchmark as they are not relevant to the specific comparison being made between arrow function notation and method binding.

Related benchmarks:

() => this.something() vs this.something.bind(this) (version: 0)

() => this.something() vs this.something.bind(this)

Comparing performance of: () => this.something() vs this.something.bind(this)

Created: 6 years ago by: Guest

Jump to the latest result

() => this.something()

this.something.bind(this)

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):