Benchmark: dissoc & dissoc2

Script Preparation code:

function dissoc(map, ...keys) {
 const newMap = Object.keys(map).reduce((accu, key) => {
    if (keys.indexOf(key) < 0) {
      accu[key] = map[key]
      return accu
    }

    return accu
  }, {})

  return newMap
}


function dissoc2(map, ...keys) {
    const newMap = Object.assign({}, map)
    for (const k of keys) {
        delete newMap[k]
    }

    return newMap
}


function dissoc3(map, ...keys) {
    const newMap = Object.assign({}, map)
    keys.forEach((k,i) => {
        delete newMap[k]
    })

    return newMap
}

Tests:

dissoc
dissoc({a:1, b:2, c:3, d:4}, 'a','d')
dissoc2
dissoc2({a:1, b:2, c:3, d:4}, 'a','d')
dissoc3
dissoc3({a:1, b:2, c:3, d:4}, 'a','d')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
dissoc
dissoc2
dissoc3

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:88.0) Gecko/20100101 Firefox/88.0

Browser/OS: Firefox 88 on Linux

View result in a separate tab

Test name	Executions per second
dissoc	5026940.0 Ops/sec
dissoc2	691577.8 Ops/sec
dissoc3	806652.6 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The MeasureThat.net benchmark is designed to measure the performance of different approaches to removing keys from an object in JavaScript. The benchmark consists of three test cases: `dissoc`, `dissoc2`, and `dissoc3`. Each test case uses a different implementation to remove keys from an object.

**Benchmark Definitions**

The three benchmark definitions are:

1. `dissoc(map, ...keys)`: This function takes a map (object) and one or more keys as arguments. It returns a new map with only the key-value pairs that are not in the list of provided keys.
2. `dissoc2(map, ...keys)`: This function takes a map and one or more keys as arguments. It creates a copy of the original map using `Object.assign()`, then deletes each key from the copy.
3. `dissoc3(map, ...keys)`: This function is similar to `dissoc2`, but it uses a `forEach` loop to delete each key from the copy.

**Comparison of Options**

The three options are compared in terms of their performance:

* **`dissoc`**: Uses `Object.keys()` and `reduce()` to iterate over the keys of the original map. This approach is likely to be slower than the other two options because it requires iterating over all key-value pairs.
* **`dissoc2`**: Creates a copy of the original map using `Object.assign()`, then deletes each key from the copy using `delete`. This approach is faster than `dissoc` but may use more memory because it creates an additional copy of the object.
* **`dissoc3`**: Uses a `forEach` loop to delete each key from the copy, which makes it slightly slower than `dissoc2`.

**Pros and Cons**

Here are some pros and cons of each approach:

* **`dissoc`**:
	+ Pros: Simple and easy to understand.
	+ Cons: May be slower due to iterating over all key-value pairs.
* **`dissoc2`**:
	+ Pros: Faster than `dissoc` and uses less memory because it creates only one copy of the object.
	+ Cons: May use more CPU cycles due to the `Object.assign()` call.
* **`dissoc3`**:
	+ Pros: Similar performance to `dissoc2`.
	+ Cons: Uses a `forEach` loop, which may be slightly slower.

**Library and Syntax**

The benchmark uses no external libraries or special JavaScript features. The implementations are straightforward and easy to understand.

**Other Considerations**

When choosing an approach for removing keys from an object in JavaScript, consider the following factors:

* Performance: If speed is critical, `dissoc2` or `dissoc3` may be a better choice.
* Memory usage: If memory efficiency is important, `dissoc2` or `dissoc3` may be a better choice.
* Code readability: If code readability is more important than performance, `dissoc` may be a better choice.

**Alternatives**

Some alternative approaches to removing keys from an object in JavaScript include:

* Using a library like Lodash or Underscore.js, which provide optimized implementations for this operation.
* Using the `delete` operator with a `for...in` loop to iterate over the keys of the object.
* Using the `Object.keys()` method and a `forEach` loop to remove keys from an object.

Related benchmarks:

dissoc & dissoc2 (version: 2)

Comparing performance of: dissoc vs dissoc2 vs dissoc3

Created: 4 years ago by: Registered User

Jump to the latest result

dissoc

dissoc2

dissoc3

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):