Benchmark: new Sym vs ++ vs new Arr vs new Obj 2

Script Preparation code:

var a = Symbol()
var b = []
var c = {}
var d = 0

Tests:

Symbol
var a2 = Symbol() a === a2
Array
var b2 = [] b === b2
Object
var c2 = {} c === c2
++
var d2 = d++ d === d2

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Symbol
Array
Object
++

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 benchmarking test cases and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**
The benchmark is testing four different approaches to compare values:

1. `Symbol()`: Creates a new symbol, which is a unique primitive value that can be used as a key in objects.
2. `++` (post-increment operator): Increments the value of a variable and returns the old value.
3. `new Arr[]` (creating a new array): Creates a new array instance.
4. `new Obj()` (creating a new object): Creates a new object instance.

**Options Compared**

The benchmark compares the execution time of each approach for the following test cases:

1. Comparing the symbol created in the script preparation code with itself (`var a2 = Symbol()\r\na === a2`).
2. Comparing the array created in the script preparation code with itself (`var b2 = []\r\nb === b2`).
3. Comparing the object created in the script preparation code with itself (`var c2 = {}\rc === c2`).
4. Comparing the value of `d++` (post-increment operator) with the original value of `d`.

**Pros and Cons**

1. **Symbol()**: This approach is efficient because symbols are unique and can be used as keys in objects, making them suitable for caching and other use cases. However, their performance may vary depending on the JavaScript engine.
2. **++**: The post-increment operator is a simple way to increment a variable while returning its old value. However, it's not suitable for all use cases, especially when used with primitive types like numbers or strings.
3. **new Arr[]** and **new Obj()**: Creating new arrays and objects can be computationally expensive, especially if the initial size is large. However, these approaches are useful when you need to create a new instance of an array or object from scratch.

**Library Usage**
In this benchmark, no specific library is used. The test cases rely on built-in JavaScript features like symbols, arrays, objects, and operators.

**Special JS Features/Syntax**
The test cases use the following special JavaScript features:

1. **Symbol**: A new primitive value introduced in ECMAScript 2015.
2. **++**: The post-increment operator, which increments a variable while returning its old value.

Other alternatives to these approaches might include:

* Using `Object.is()` or `===` with objects to compare their contents.
* Creating a wrapper class for arrays and objects to provide more control over their creation.
* Using specialized libraries like Lodash or Ramda for array and object operations.

Keep in mind that the choice of approach depends on the specific use case, performance requirements, and personal preference.

Related benchmarks:

new Sym vs ++ vs new Arr vs new Obj 2 (version: 0)

Comparing performance of: Symbol vs Array vs Object vs ++

Created: 2 years ago by: Registered User

Jump to the latest result

Symbol

Array

Object

++

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):