Benchmark: Switch vs Object Literal methods

Script Preparation code:

var str = 'abc'.charAt(Math.floor(Math.random() * 3));

Tests:

Switch
function test(str) { switch (str) { case 'a': return 'A'; break; case 'b': return 'B'; break; case 'c': return 'C'; break; } } console.log(test(str));
Object Literal
function test(str) { return { a: 'A', b: 'B', c: 'C', }[str]; } console.log(test(str));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Switch
Object Literal

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided benchmark and explain what's being tested, compared, and the pros/cons of each approach.

**Benchmark Definition**

The benchmark is designed to compare two approaches: `switch` statements and object literal methods (also known as bracket notation). The script preparation code creates a random string variable `str` with values 'a', 'b', or 'c'. This variable will be used in both test cases.

**Script Preparation Code**
```javascript
var str = 'abc'.charAt(Math.floor(Math.random() * 3));
```
This line generates a random index for the string 'abc' using `Math.random()` and `Math.floor()`. The resulting value is stored in the variable `str`.

**Html Preparation Code**

There is no HTML preparation code provided, which means that only JavaScript execution time is being measured.

**Test Cases**

Two test cases are defined:

### Switch Test Case
```javascript
function test(str) {
  switch (str) {
    case 'a': return 'A'; break;
    case 'b': return 'B'; break;
    case 'c': return 'C'; break;
  }
}
```
This test case uses a traditional `switch` statement to determine the value of `str`. The `break` statements ensure that the execution stops after the correct branch is reached.

### Object Literal Test Case
```javascript
function test(str) {
  return {
    a: 'A',
    b: 'B',
    c: 'C',
  }[str];
}
```
This test case uses bracket notation to access an object property based on the value of `str`. The syntax `object[property]` returns the value associated with the specified key.

**Comparison**

The benchmark is comparing the execution time of both approaches:

* `switch` statements
* Object literal methods (bracket notation)

**Pros and Cons:**

### Switch Statements

Pros:

* Easy to read and maintain, especially for large numbers of cases.
* Can be more efficient in some situations due to caching.

Cons:

* Can lead to slower execution times due to the overhead of branch prediction and misprediction penalties.
* May not perform well with a large number of cases or dynamic values.

### Object Literal Methods

Pros:

* Can be faster than `switch` statements, especially for small numbers of cases.
* Often more concise and readable.

Cons:

* Can lead to slower execution times due to the overhead of property lookup.
* Requires careful consideration of object size and complexity to avoid performance issues.

**Library/ Framework**

There is no library or framework mentioned in the benchmark. The script uses built-in JavaScript features only.

**Special JS Feature/Syntax**

No special JavaScript feature or syntax is used in this benchmark. However, it's worth noting that the use of bracket notation with object literals is a common pattern in modern JavaScript development.

**Alternatives**

Other alternatives to these approaches include:

* Using `if-else` statements instead of `switch`
* Implementing a hash table or other data structure for faster lookups
* Utilizing just-in-time (JIT) compilation or other optimization techniques

In summary, the benchmark is comparing two common JavaScript approaches: traditional `switch` statements and object literal methods. The results will indicate which approach is faster in this specific scenario, providing insights into optimization strategies for similar use cases.

Related benchmarks:

Switch vs Object Literal methods (version: 0)

Comparing performance of: Switch vs Object Literal

Created: 4 years ago by: Guest

Jump to the latest result

Switch

Object Literal

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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