Benchmark: create temp object vs Object.fromEntries

Script Preparation code:

var array = Array.from(Array(10000).keys()).map(i => {
    var length = Math.round(Math.random()*100)
    var result           = '';
    var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    var charactersLength = characters.length;
    for ( var i = 0; i < length; i++ ) {
      result += characters.charAt(Math.floor(Math.random() * 
 charactersLength));
   }
   return result;
})

Tests:

Object.fromEntries
Object.fromEntries(array.map(value => [value, value]));
creating temporary objects
const data = {} array.forEach(value => data[value] = value);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.fromEntries
creating temporary objects

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.

I'll break down the provided benchmark and explain what's being tested, compared options, pros and cons of each approach, and other considerations.

**Benchmark Overview**

The benchmark is comparing two approaches for creating an object with dynamic key-value pairs:

1. `Object.fromEntries` (a built-in JavaScript method)
2. Creating a temporary object using the `forEach` loop and direct assignment (`data[value] = value`)

**Options Being Compared**

Two options are being compared:

* **Option 1: `Object.fromEntries`**
	+ Purpose: Create an object from key-value pairs provided as an array of entries.
	+ Description: Passes an array of key-value pairs to the `Object.fromEntries` method, which returns a new object with the specified keys and values.
* **Option 2: Creating temporary objects using the `forEach` loop**
	+ Purpose: Create a temporary object by iterating over an array using the `forEach` loop and assigning each value as a key-value pair in the object.

**Pros and Cons of Each Approach**

### Object.fromEntries

Pros:

1. **Concise and readable**: The syntax is straightforward, making it easy to understand for developers.
2. **Fast performance**: As this method is built-in, it's likely optimized for performance.

Cons:

1. **Limited control**: The `Object.fromEntries` method returns a new object, so you don't have direct access to the underlying data structure.

### Creating Temporary Objects using forEach

Pros:

1. **Flexibility**: You can directly modify or inspect the temporary object as needed.
2. **Low overhead**: No additional methods are called, making it potentially more efficient than `Object.fromEntries`.

Cons:

1. **Verbose syntax**: The code is less readable and more verbose compared to `Object.fromEntries`.
2. **Potential performance issues**: Depending on the specific use case, creating a temporary object using `forEach` might lead to unnecessary memory allocations or garbage collection.

**Library/Dependencies**

None mentioned in this benchmark definition.

**Special JS Features/Syntax**

The benchmark uses JavaScript syntax and features, such as:

1. `Array.from()` method
2. `map()` method
3. `forEach()` loop

These are standard JavaScript features and don't require special knowledge to understand.

**Other Alternatives**

If the goal is to create an object with dynamic key-value pairs, other alternatives might include:

1. Using a library like Lodash or Ramda for functional programming utilities.
2. Utilizing a different data structure, such as a Map or a WeakMap (if you're targeting modern browsers).
3. Implementing a custom solution using JavaScript's built-in data structures and methods.

For this specific benchmark, the focus is on comparing two approaches: `Object.fromEntries` and creating temporary objects using `forEach`.

Related benchmarks:

create temp object vs Object.fromEntries (version: 0)

Comparing performance of: Object.fromEntries vs creating temporary objects

Created: 4 years ago by: Guest

Jump to the latest result

Object.fromEntries

creating temporary objects

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):