Benchmark: Switch VS Object tiktok

Script Preparation code:

var str = 'a';

Tests:

Switch
switch (str) { case 'a': {return 'a'} case 'b': {return 'b'} case 'c': {return 'c'} }
Object Literal
const objLiteral = { a: 'a', b: 'b', c: 'c' } objLiteral[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:

No previous 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 JSON data and explain what's being tested, compared, and considered in the benchmark.

**Benchmark Overview**

MeasureThat.net is a platform that allows users to create and run JavaScript microbenchmarks. The provided JSON data represents two individual test cases: "Switch" and "Object Literal". These test cases aim to compare the performance of JavaScript switch statements versus object literals.

**Test Cases: Switch and Object Literal**

1. **Switch Test Case**
The "Switch" test case is defined by a benchmark definition in the JSON data:
```javascript
switch (str) {
  case 'a': { return 'a' }
  case 'b': { return 'b' }
  case 'c': { return 'c' }
}
```
This code uses a traditional `switch` statement with a variable `str`. The test aims to measure the execution time of this simple switch statement.

**Pros and Cons of Switch Statements**

Switch statements are generally considered slower than object literals due to:

* ** overhead**: Each case in a switch statement requires a jump instruction, which can lead to higher memory usage.
* **branch prediction**: Modern CPUs often struggle with predicting branch outcomes in switch statements, leading to more cache misses.

However, switch statements have some advantages:

* **Readability**: Switch statements can be easier to read and maintain than object literals, especially for simple cases.

**Test Case: Object Literal**

The "Object Literal" test case is defined by another benchmark definition in the JSON data:
```javascript
const objLiteral = {
  a: 'a',
  b: 'b',
  c: 'c'
}
objLiteral[str];
```
This code uses an object literal and accesses its property dynamically using bracket notation.

**Pros and Cons of Object Literals**

Object literals are generally considered faster than switch statements due to:

* **Caching**: Modern CPUs often cache object literals, making it easier for the CPU to access their properties.
* **branch prediction**: Branch prediction is typically better for object literals, leading to fewer cache misses.

However, object literals have some disadvantages:

* **Readability**: Object literals can be harder to read and maintain than switch statements, especially for complex cases.
* **Memory usage**: Object literals require more memory than switch statements due to the overhead of objects.

**Library Usage**

In both test cases, no specific libraries are used. However, it's worth noting that modern JavaScript engines often use various internal optimizations and heuristics when dealing with object literals, which can impact performance.

**Special JS Features/Syntax**

There is no special JavaScript feature or syntax mentioned in these test cases. The focus is on comparing the performance of switch statements versus object literals.

**Alternatives to Switch Statements and Object Literals**

If you need alternative approaches to switch statements or object literals, consider:

* **Lookup tables**: Precomputing a lookup table for a set of values can be faster than using a switch statement.
* **Polymorphic functions**: Using polymorphic functions with dynamic dispatch can provide similar performance to object literals while maintaining readability.
* **Array-based approaches**: In some cases, using arrays and array methods (e.g., `indexOf`, `findIndex`) can provide efficient alternatives to switch statements.

Keep in mind that these alternatives may require additional setup or boilerplate code and might not always outperform the original approach.

Related benchmarks:

Switch VS Object tiktok (version: 0)

Comparing performance of: Switch vs Object Literal

Created: 3 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):