Benchmark: lodash pick vs omit

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@3.10.0/index.min.js"></script>

Script Preparation code:

var a = {
  foo: "foo",
  bar: undefined
};

Tests:

omit
_.omit(a, _.isEmpty)
pick
_.pick(a, _.identity)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
omit
pick

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 13 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Windows

View result in a separate tab

Test name	Executions per second
omit	12012156.0 Ops/sec
pick	11749218.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark for you.

**Benchmark Definition and Preparation Code**

The benchmark is defined as `lodash pick vs omit`, which implies that we're comparing two different ways of using the Lodash library, `pick` and `omit`, to manipulate an object `a`.

The preparation code is a JavaScript snippet that creates an object `a` with two properties: `foo` with string value "foo" and `bar` with undefined value. This object will be used as input for our benchmark.

**Html Preparation Code**

The HTML preparation code includes a script tag that loads the Lodash library version 3.10.0 from a CDN. This is necessary because the benchmark relies on this specific version of Lodash.

**Individual Test Cases**

We have two test cases:

1. `_.omit(a, _.isEmpty)`
2. `_.pick(a, _.identity)`

Let's analyze these test cases:

* In both cases, we're passing an object `a` to the respective functions.
* For `.omit()`, we're passing a predicate function `_`(`.isEmpty`) that will be called for each property in `a`. The function returns true if the value is undefined or empty string. The result of this predicate is used to determine which properties should be omitted from the original object.
* For `.pick()`, we're passing an identity function `_`(`_.identity`) as a selector. The identity function simply returns its input unchanged, so in this case, it will include all properties from `a`.

**Options Compared**

The two test cases are compared in terms of execution speed. The benchmark measures how fast each approach is to execute.

**Pros and Cons of Different Approaches**

* **_.omit()**: This approach can be faster for large objects because it only iterates over the keys that need to be omitted, whereas `.pick()` might require iterating over all properties (including those not present in `a`). However, if `a` is very small or has a high number of undefined values, `.pick()` might perform better.
* **_.pick()**: This approach can be slower because it includes all properties from the original object, even if they're not used. However, it's often more intuitive and easier to understand than `.omit()`, especially for developers who are accustomed to working with `Object.assign()` or similar methods.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides a collection of functional programming helpers. In this benchmark, we're using two specific functions from the Lodash library:

* `_.pick()`: Returns a new object containing only the specified properties from the original object.
* `_.omit()`: Removes properties from an object and returns a new object with only the specified keys.

Both functions are commonly used in JavaScript development for working with objects, but they serve opposite purposes: `.pick()` extracts values from an object while `.omit()` removes them.

**Special JS Feature or Syntax**

In this benchmark, we're not using any special JavaScript features or syntax. The code is written in standard ECMAScript 5/6 syntax and relies on the Lodash library's existing functionality.

**Other Alternatives**

If you need to perform object manipulation similar to this benchmark, you can consider alternative libraries or approaches:

* Vanilla JavaScript: You can use `Object.assign()` or `Object.fromEntries()` to create a new object with specific properties.
* Other utility libraries: Libraries like Immutable.js or Ramda provide similar functionality to Lodash and might be suitable alternatives.

Keep in mind that each library has its own strengths, weaknesses, and learning curves. The choice ultimately depends on your project's requirements, team preferences, and the desired level of abstraction.

Related benchmarks:

lodash pick vs omit (version: 0)

Comparing performance of: omit vs pick

Created: 5 years ago by: Guest

Jump to the latest result

omit

pick

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):