Benchmark: switch case vs object (string as key)

Tests:

switch case
const roleIndex = 'abcd'; let role; switch(roleIndex) { case 'abcd': role = 'admin'; break; case 'efgh': role = 'moderator'; break; default: role = 'user'; }
object
const roleIndex = 'abcd'; const role = { abcd: 'admin', efgh: 'moderator' }[roleIndex] ?? 'user';

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
switch case
object

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36

Browser/OS: Chrome 143 on Windows

View result in a separate tab

Test name	Executions per second
switch case	207604512.0 Ops/sec
object	185641536.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Purpose:**

The benchmark is designed to compare the performance of two approaches: traditional `switch` statements and object-based lookups (using the bracket notation).

**Options Compared:**

There are two main options being compared:

1. **Switch Statement:** The first option uses a traditional `switch` statement with multiple cases to determine the value of the `role` variable.
2. **Object-Based Lookup:** The second option uses an object-based approach, where an object is created with string keys and values for each role, and then the value is retrieved using the bracket notation (`[key] ?? 'user'`).

**Pros and Cons:**

* **Switch Statement:**
	+ Pros:
		- Easy to understand and maintain
		- Can be more readable for simple cases
	+ Cons:
		- Can lead to performance issues with many cases due to the overhead of jumping between cases
		- May not be suitable for large numbers of cases or complex logic
* **Object-Based Lookup:**
	+ Pros:
		- More efficient and scalable, especially for larger objects or more complex logic
		- Can reduce the number of jumps between cases, resulting in better performance
	+ Cons:
		- May require more boilerplate code (e.g., object creation, bracket notation)
		- Less readable than traditional `switch` statements for simple cases

**Library and Syntax:**

In both benchmark definitions, there are no external libraries used. However, the syntax used is specific to JavaScript.

**Special Features/Syntax:**

* **Optional Chaining (??):** The object-based lookup uses the optional chaining operator (`?.`) which was introduced in ECMAScript 2020. It allows for safe navigation and avoidance of null pointer exceptions.
* **Bracket Notation:** The object-based lookup also uses the bracket notation (`[key] ?? 'value'`) to retrieve values from an object. This syntax is also part of ECMAScript.

**Other Alternatives:**

For similar benchmarks, consider testing:

1. **Regular Expressions:** Using regular expressions to match and extract values.
2. **Array-Based Lookup:** Using arrays with index-based lookup.
3. **Function-Based Approach:** Using functions to perform the logic instead of traditional `switch` statements or object-based lookups.

These alternatives can provide different perspectives on performance, readability, and maintainability for similar use cases.

Related benchmarks:

switch case vs object (string as key) (version: 0)

Comparing performance of: switch case vs object

Created: 2 years ago by: Guest

Jump to the latest result

switch case

object

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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