Benchmark: Optional Chaining versus _.get lodash

Script Preparation code:

var obj = {a: {b: {c: {d: 1}}}}
var badObj = {}

Tests:

Optional Chaining
(obj.a == null ? undefined : obj.a.b == null ? undefined : obj.a.b.c == null ? undefined : obj.a.b.c.d) || 2 (badObj.a == null ? undefined : badObj.a.b == null ? undefined : badObj.a.b.c == null ? undefined : badObj.a.b.c.d) || 2
Lodash
_.get(obj, "a.b.c.d", 2) _.get(badObj, "a.b.c.d", 2)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Optional Chaining
Lodash

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark is testing two approaches to accessing nested properties of objects:

1. **Optional Chaining**: This is a JavaScript feature introduced in ECMAScript 2020 (ES12). It allows you to access nested properties of an object while providing a default value if any of the intermediate steps are null or undefined.
2. **Lodash _.get() function**: Lodash is a popular utility library for JavaScript that provides various functions for common tasks, including data manipulation and string manipulation.

**Options Compared**

The benchmark compares two options:

1. **Optional Chaining**
2. **Lodash _.get() function with two arguments (value and default)**

**Pros and Cons**

**Optional Chaining**

Pros:

* More concise and expressive code
* Faster execution, as it avoids the overhead of calling a separate function
* Part of the standard JavaScript language, making it more familiar to developers

Cons:

* Not all browsers support ES12, so older browsers might not execute this benchmark correctly
* Can be less readable for developers who are not familiar with this syntax

**Lodash _.get() function**

Pros:

* More readable code, as the default value is explicitly specified
* Works in older browsers that don't support ES12
* Part of a well-known and widely-used library, making it easier to find resources and community support

Cons:

* More verbose code compared to Optional Chaining
* Slower execution, due to the overhead of calling a separate function
* Requires including an additional library, which can add overhead

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides various functions for common tasks, such as data manipulation, string manipulation, and functional programming utilities. The _.get() function is part of this library, which allows you to safely access nested properties of objects while providing a default value.

**Special JS Feature or Syntax: None**

There are no special JavaScript features or syntaxes being used in this benchmark beyond the Optional Chaining feature introduced in ES12.

**Other Alternatives**

If you want to compare alternative approaches to accessing nested properties, here are a few options:

1. **Brackets**: Brackets is another dot notation style for accessing nested properties of objects.
2. **Property access with multiple dots**: Accessing nested properties using multiple dots (e.g., `obj.a.b.c.d`) instead of Optional Chaining.
3. **Using a function**: Using a separate function to retrieve the value, like this: `function getValue(obj) { return obj.a && obj.a.b && obj.a.b.c && obj.a.b.c.d; }`

Keep in mind that these alternatives may have different performance characteristics and code readability trade-offs compared to Optional Chaining and Lodash _.get().

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:131.0) Gecko/20100101 Firefox/131.0

Browser/OS: Firefox 131 on Windows

View result in a separate tab

Test name	Executions per second
Optional Chaining	134739152.0 Ops/sec
Lodash	3552687.2 Ops/sec

Related benchmarks:

Optional Chaining versus _.get lodash (version: 0)

Comparing performance of: Optional Chaining vs Lodash

Created: 6 years ago by: Guest

Jump to the latest result

Optional Chaining

Lodash

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):