Benchmark: Switch true vs if else

Script Preparation code:

hi = {
1: 3,
4: 7,
2: 999
};
a=1;
b=3;

Tests:

switch
switch (true) { case (a in hi): console.log('wow'); break; default: console.log('nope'); } a = (a>1000) ? 0 : ++a
if else
if (a in hi) { console.log('wow'); } else { console.log('nope'); } a = (a>1000) ? 0 : ++a

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
switch
if else

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser/OS: Chrome 130 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
switch	356127.1 Ops/sec
if else	357896.7 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 is testing two different approaches to handle conditional statements: `switch` and `if-else`. The benchmark definition provides a script that contains a variable `a` initialized to 1, and an object `hi` with key-value pairs (e.g., `hi = {1: 3, 4: 7, 2: 999}`). The benchmark defines two test cases:

1. **switch**: Using the `switch` statement, it checks if the value of `a` is present in the object `hi`. If a match is found, it logs "wow" to the console and breaks out of the loop. If no match is found, it logs "nope".
2. **if-else**: Using the `if-else` statement, it checks if the value of `a` is present in the object `hi`. If a match is found, it logs "wow" to the console. If not, it logs "nope".

**Options Compared**

The benchmark is comparing the performance of two approaches:

1. **switch**: This approach uses a lookup table (the object `hi`) to determine which value in the object corresponds to the current value of `a`.
2. **if-else**: This approach checks if the value of `a` matches any key in the object `hi` using an `in` operator.

**Pros and Cons**

* **switch**:
	+ Pros: Can be faster when dealing with a fixed set of values, as it uses a lookup table.
	+ Cons: May not perform well if the number of possible values is large or constantly changing.
* **if-else**:
	+ Pros: Can handle variable numbers of cases and can be flexible in its logic.
	+ Cons: Can be slower than `switch` due to the overhead of the `in` operator and potential branching.

**Library Usage**

The benchmark uses a library for logging messages to the console. The exact library is not specified, but based on the code, it appears to be using the built-in `console.log()` function provided by JavaScript's web APIs.

**Special JS Feature or Syntax**

There are no special features or syntax used in this benchmark beyond what's required for standard JavaScript execution.

**Other Considerations**

When considering the performance of these two approaches, keep in mind that the use case and expected values can greatly impact the performance. For example, if `a` is likely to be within a specific range of values (e.g., 1-100), `switch` might be faster than `if-else`. On the other hand, if `a` can take on any value, including very large or small numbers, `if-else` might be more suitable.

**Alternatives**

Other alternatives to consider when dealing with conditional statements include:

* Using a more specialized data structure, such as an array of values and their corresponding logic.
* Implementing custom caching mechanisms to reduce lookup times.
* Utilizing parallel processing or multi-threading to handle large sets of cases concurrently.

Related benchmarks:

Switch true vs if else (version: 0)

Comparing performance of: switch vs if else

Created: 5 years ago by: Guest

Jump to the latest result

switch

if else

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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