Benchmark: Switch vs map with string keys

Tests:

Switch
const input = 'ten'; switch(input) { case 'one': return true; case 'two': return true; case 'three': return true; case 'four': return true; case 'five': return true; case 'six': return true; case 'seven': return true; case 'eight': return true; case 'nine': return true; case 'ten': return true; }
Map
const input = 'ten'; const LUT = { zero: true, one: true, two: true, three: true, four: true, five: true, six: true, seven: true, eight: true, nine: true, ten: true } LUT[input];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Switch
Map

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 8 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36

Browser/OS: Chrome 139 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Switch	180787984.0 Ops/sec
Map	184650624.0 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 Definition**

The benchmark consists of two test cases: `Switch` and `Map`. Both tests measure the performance of different approaches to check if a string value matches one of several predefined values.

**Options Compared**

1. **Switch Statement**: This approach uses a switch statement to check the input string against multiple case values.
2. **Array Lookup (Map)**: This approach uses an object (LUT) with string keys and boolean values, where the value corresponding to the input string is returned.

**Pros and Cons of Each Approach**

**Switch Statement**

Pros:

* Simple and easy to understand
* Can be more efficient for small numbers of cases

Cons:

* Not as scalable as other approaches (more cases means slower performance)
* May not work well with large datasets or dynamic values

**Array Lookup (Map)**

Pros:

* Scalable and efficient, even for large numbers of cases
* Can handle dynamic values and large datasets

Cons:

* More complex to understand and implement
* May require more memory to store the object

**Library Used**

In both test cases, no specific JavaScript library is used. The switch statement is a built-in JavaScript construct, while the array lookup approach uses an object literal (LUT).

**Special JS Feature or Syntax**

None of these approaches rely on special JavaScript features or syntax.

**Other Considerations**

When choosing between these two approaches, consider the following factors:

* **Number of cases**: If you need to check against a small number of values (e.g., 5-10), a switch statement might be sufficient. However, if you need to check against many values (e.g., hundreds or thousands), an array lookup approach is likely more efficient.
* **Data size and complexity**: If you're working with large datasets or dynamic values, an array lookup approach can provide better performance.

**Alternatives**

Other approaches that might be used for this type of benchmark include:

* Using a hash table (e.g., `Object.create()` or a third-party library like Lodash's `isEqual()` function)
* Implementing a custom search algorithm (e.g., binary search or linear search)
* Using a different data structure, such as a trie or suffix tree

However, these alternatives are not explicitly mentioned in the provided benchmark definition.

Related benchmarks:

Switch vs map with string keys (version: 0)

Comparing performance of: Switch vs Map

Created: 7 years ago by: Guest

Jump to the latest result

Switch

Map

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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