Benchmark: Object literal vs Object.create

Script Preparation code:

var subarrs = [
 [ "hello", true, 7 ],
 [ "yes", "no", "maybe", false, 27 ],
 [ 16, "I", "wonder", "what", "will", "be", "fastest"]
];

Tests:

Object Literal
const result = Array(1000000).reduce((acc, _, index) => { return { a: index } }, {}) result.a = 1
Object.create
const result = Array(1000000).reduce((acc, _, index) => { return Object.create({ a: index }) }, {}) result.a = 1

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object Literal
Object.create

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 dive into the world of JavaScript microbenchmarks!

The provided JSON represents two benchmark test cases, comparing the performance of using object literals versus `Object.create()` in JavaScript.

**What is being tested?**

In this case, we're testing how fast it is to create an array of 1 million objects, where each object has a single property `a` initialized with its index. The goal is to determine which approach (object literal or `Object.create()`) results in faster execution.

**Options compared:**

There are two options being compared:

1. **Object Literal**: Using the syntax `const result = Array(1000000).reduce((acc, _, index) => {\r\n  return { a: index }\r\n}, {})`.
2. **Object.create()**: Using the syntax `const result = Array(1000000).reduce((acc, _, index) => {\r\n  return Object.create({ a: index })\r\n}, {})`.

**Pros and Cons of each approach:**

* **Object Literal:**
	+ Pros:
		- Simple and concise syntax
		- Fast, as it avoids the overhead of creating an object with no properties
	+ Cons:
		- Can be slower if the resulting object needs to have multiple properties or methods
* **Object.create():**
	+ Pros:
		- Allows for more flexibility in creating objects with multiple properties and methods
		- Can be faster in some cases, as it avoids the overhead of initializing an empty object
	+ Cons:
		- Requires more code to achieve the same result

**Library usage:**

Neither benchmark uses any external libraries. The `Array.reduce()` method is a built-in JavaScript function.

**Special JS feature or syntax:**

The benchmarks use the `reduce()` method, which is a functional programming pattern that allows us to iterate over an array and accumulate values in a new array. This is a common pattern in JavaScript development.

**Other alternatives:**

If you were to implement this benchmark manually without using `Array.reduce()`, you might consider using a simple loop instead:
```javascript
const result = [];
for (let i = 0; i < 1000000; i++) {
  const obj = {};
  obj.a = i;
  result.push(obj);
}
```
This approach would be slower than using `Array.reduce()`, as it involves more overhead and iterations.

Another alternative could be to use a different data structure, such as a `Map` or an `Object.create()` with multiple properties, to create the objects in a single step:
```javascript
const result = [];
for (let i = 0; i < 1000000; i++) {
  const obj = Object.create({ a: i });
  // ...
}
```
However, these alternatives would likely result in slower performance than using `Array.reduce()`.

In summary, the choice between object literals and `Object.create()` depends on your specific use case. If you need to create objects with multiple properties or methods, `Object.create()` might be a better option. Otherwise, object literals can provide faster execution times for simple use cases like this benchmark.

Related benchmarks:

Object literal vs Object.create (version: 0)

Comparing performance of: Object Literal vs Object.create

Created: 4 years ago by: Guest

Jump to the latest result

Object Literal

Object.create

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):