Benchmark: object spread vs immutable-js merge 4.3.0

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/4.3.0/immutable.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/immutability-helper@2.7.0/index.min.js"></script>

Tests:

object spread
let obj = {}; for(i=0;i<100;i++){ const key = 'key'+i const value = 'value'+i obj = {...obj, [key]: {key, value}} }
immutable-js
let obj = Immutable.Map(); for(i=0;i<100;i++){ const key = 'key'+i const value = 'value'+i obj = obj.merge({key: {key, value}}) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
object spread
immutable-js

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**Benchmark Definition**

The website uses JSON to define the benchmark, which includes the following:

* `Name`: The name of the benchmark, which is "object spread vs immutable-js merge 4.3.0".
* `Description` and `Script Preparation Code` are empty, indicating that there's no description provided, and no special script preparation code needed.
* `Html Preparation Code` includes links to two external libraries: Immutable.js (version 4.3.0) and Immutability Helper (version 2.7.0). These libraries will be used in the benchmark.

**Test Cases**

The benchmark consists of two test cases, each with a different approach:

1. **Object Spread**: The first test case uses JavaScript's object spread operator (`{...obj, [key]: {key, value}}`) to add a new property to an existing object.
2. **Immutable-js**: The second test case uses the Immutable.js library (version 4.3.0) and its `merge` function to add a new property to an existing Map object.

**Options Compared**

The benchmark compares two approaches:

* **Object Spread**: This approach uses JavaScript's built-in object spread operator to modify the object.
* **Immutable-js**: This approach uses the Immutable.js library to create a new Map object and merge it with the original object.

**Pros and Cons of Each Approach**

Here are some pros and cons for each approach:

### Object Spread

Pros:

* Easy to understand and use
* Fast and efficient (since it's built-in JavaScript)

Cons:

* Creates a new object, potentially leading to memory issues if not done carefully
* Can be less predictable in certain scenarios, such as when dealing with nested objects or arrays

### Immutable-js

Pros:

* Provides a more explicit and predictable way of modifying immutable data structures
* Reduces the risk of memory issues since data is never modified directly

Cons:

* Requires additional library inclusion
* May have performance overhead due to the creation of new, isolated data structures

**Other Considerations**

When choosing between these approaches, consider the following factors:

* **Predictability**: If predictability and safety are critical for your use case, Immutable-js might be a better choice. However, if ease of use and speed are more important, object spread might be sufficient.
* **Memory Efficiency**: If memory efficiency is a concern, Immutable-js might be a better option since it avoids creating new objects in place.

**Special JS Features/Syntax**

There's no special JavaScript feature or syntax used in these test cases. Both approaches rely on standard JavaScript features.

**Alternatives**

If you're interested in exploring alternative approaches, consider the following options:

* **Lodash**: Lodash provides a `merge` function that can be used to merge objects in a similar way to Immutable-js.
* **JavaScript's `Array.prototype.push()` and object's `setItem()` methods**: These methods can be used to add properties to an object or array, although they might not provide the same level of predictability as Immutable-js.

I hope this explanation helps you understand the benchmark definition and test cases!

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36

Browser/OS: Chrome 111 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
object spread	6832.5 Ops/sec
immutable-js	44093.1 Ops/sec

Related benchmarks:

object spread vs immutable-js merge 4.3.0 (version: 0)

Comparing performance of: object spread vs immutable-js

Created: one year ago by: Guest

Jump to the latest result

object spread

immutable-js

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):