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__proto__ vs. create vs create
(version: 0)
Comparing performance of:
one vs create vs create and assign
Created:
7 years ago
by:
Guest
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Script Preparation code:
var obj = null; var i = 0;
Tests:
one
let p = {idx : i}; obj = {idx : -i, __proto__ : p}; ++i;
create
let p = {idx : i}; obj =Object.create(p, {idx : {value : -i}}); ++i;
create and assign
let p = {idx : i}; obj = Object.create(p); obj.idx = -i; ++i;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
one
create
create and assign
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested. **Benchmark Definition** The benchmark is defined by two approaches: `__proto__`, `create`, and `create and assign`. The goal is to compare their performance in creating an object with a specific property. **Options Compared** 1. **`__proto__`**: This approach uses the prototype chain to create the object. It sets the `obj.__proto__` property to reference the existing object `p`, which has the desired property `idx`. When `++i` is executed, it increments the `idx` property in both objects. 2. **`create`**: This approach uses the `Object.create()` method to create a new object with the specified prototype and properties. It creates an object `obj` with the same properties as `p`, including `idx`. The `++i` operation increments the `idx` property only in the newly created object. 3. **`create and assign`**: This approach is similar to the `create` method, but it assigns the value `-i` directly to the `obj.idx` property after creating the object. **Pros and Cons** 1. **`__proto__`**: * Pros: Efficient use of memory, as no new objects are created. * Cons: Can lead to unexpected behavior due to the prototype chain, making it harder to understand and debug. 2. **`create`**: * Pros: Creates a separate object with its own properties, which can be useful for encapsulation. * Cons: Requires more memory compared to `__proto__`, as a new object is created. 3. **`create and assign`**: * Pros: Similar to the `create` method but allows direct assignment of values, making it easier to manage complex objects. * Cons: May lead to slower performance due to the additional assignment operation. **Library** None mentioned in this specific benchmark definition. However, `Object.create()` is a built-in JavaScript method that creates a new object with the specified prototype and properties. **Special JS Feature or Syntax** The only special feature used here is the `++` operator, which increments the value of its operand by 1. This is a common JavaScript feature used for iteration and counter variables. **Other Alternatives** If you're looking for alternative approaches to create objects with specific properties: * **Using a class**: You can define a class using the `class` keyword and instantiate it to create an object with the desired properties. * **Using a constructor function**: Similar to classes, you can define a constructor function and use it to create objects with specific properties. Here's some sample code to illustrate these alternatives: ```javascript // Class approach class ObjectWithIdx { constructor() { this.idx = i; } } let objClass = new ObjectWithIdx(); // Constructor function approach function ObjectWithIdx(i) { this.idx = i; } let objConstructor = new ObjectWithIdx(0); ``` Keep in mind that these alternatives may not provide the exact same performance characteristics as the original benchmark methods.
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