Benchmark: switch vs if else vs do while vs object

Script Preparation code:

var a = 'yhahaha';

Tests:

switch
var b; switch(a) { case 'ahaha': b = 1; break; case 'ohoho': b = 2; break; case 'ihihi': b = 3; break; case 'yhahaha': b = 4; break; }
if else
var b; if (a === 'ahaha') { b = 1; } else if (a === 'ohoho') { b = 2; } else if (a === 'ihihi') { b = 3; } else if (a === 'yhahaha') { b = 4; }
do while 0
var b; do { if (a === 'ahaha') { b = 1; break; } if (a === 'ohoho') { b = 2; break; } if (a === 'ihihi') { b = 3; break; } if (a === 'yhahaha') { b = 4; } } while(0)
object
var b = { ahaha: 1, ohoho: 2, ihihi: 3, yhahaha: 4, }[a]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
switch
if else
do while 0
object

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	16338544.0 Ops/sec
if else	4373649.5 Ops/sec
do while 0	4370581.5 Ops/sec
object	16349788.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark definition and test cases to explain what's being tested, compare different approaches, and discuss pros and cons.

**Benchmark Definition**

The benchmark measures the performance of four different approaches:

1. `switch` statement
2. `if-else` chain
3. `do-while` loop with nested `if`s
4. Object-based indexing

Each approach is designed to achieve the same result: assigning a value to a variable `b` based on the string `a`.

**Individual Test Cases**

Here's a brief explanation of each test case:

1. **Switch Statement**
```javascript
switch(a) {
  case 'ahaha': b = 1; break;
  case 'ohoho': b = 2; break;
  case 'ihihi': b = 3; break;
  case 'yhahaha': b = 4; break;
}
```
The switch statement uses a `switch` keyword to evaluate the value of `a`. If the value matches one of the specified cases, the corresponding code is executed.

2. **If-Else Chain**
```javascript
if (a === 'ahaha') { b = 1; } else if (a === 'ohoho') { b = 2; } else if (a === 'ihihi') { b = 3; } else if (a === 'yhahaha') { b = 4; }
```
This code uses an `if-else` chain to evaluate the value of `a`. Each conditional statement is checked in sequence until a match is found.

3. **Do-While Loop with Nested Ifs**
```javascript
do {
  if (a === 'ahaha') { b = 1; break; }
  if (a === 'ohoho') { b = 2; break; }
  if (a === 'ihihi') { b = 3; break; }
} while(0)
```
This code uses a `do-while` loop with nested `if` statements to evaluate the value of `a`. The loop continues until all conditions are met.

4. **Object-Based Indexing**
```javascript
var b = {
  ahaha: 1,
  ohoho: 2,
  ihihi: 3,
  yhahaha: 4
}[a]
```
This code uses an object with string keys to access a value based on the value of `a`.

**Pros and Cons**

Here's a brief analysis of each approach:

* **Switch Statement**: Pros - concise, efficient for multiple cases. Cons - may not be suitable for more complex logic.
* **If-Else Chain**: Pros - easy to read, maintainable. Cons - can become cluttered for many conditions.
* **Do-While Loop with Nested Ifs**: Pros - can be optimized for performance. Cons - can be challenging to read and maintain.
* **Object-Based Indexing**: Pros - concise, flexible. Cons - may not be suitable for all data structures.

**Library Usage**

The benchmark uses the `break` statement, which is a built-in JavaScript statement that exits the switch block.

**Special JS Features**

There are no special JavaScript features or syntax used in this benchmark.

**Alternative Approaches**

Other alternatives to these approaches include:

* **Array Indexing**: Instead of using an object, you can use an array with string keys.
* **Regular Expressions**: You can use regular expressions to match the value of `a` and assign a value to `b`.
* **Polymorphic Functions**: You can define a function that takes an argument and returns a value based on the input.

Keep in mind that these alternatives may have performance implications or trade-offs in terms of maintainability and readability.

Related benchmarks:

switch vs if else vs do while vs object (version: 0)

Comparing performance of: switch vs if else vs do while 0 vs object

Created: 6 years ago by: Registered User

Jump to the latest result

switch

if else

do while 0

object

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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