Benchmark: Switch vs Object (Simplified)

Script Preparation code:

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

Tests:

Switch
switch (str) { case 'a': return 'a'; case 'b': return 'b'; case 'c': return 'c'; }
Object
var 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

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36

Browser/OS: Chrome 127 on Linux

View result in a separate tab

Test name	Executions per second
Switch	38487860.0 Ops/sec
Object	38661624.0 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 JSON and explain what's being tested.

**Benchmark Definition**

The benchmark is called "Switch vs Object (Simplified)" and has two test cases: "Switch" and "Object". The purpose of this benchmark is to compare the performance of using a `switch` statement versus an object literal to access a value.

**Script Preparation Code**

The script preparation code sets up a string variable `str` with a random character from 'a', 'b', or 'c'. This will be used as the value being accessed in both test cases.

**Html Preparation Code**

There is no HTML preparation code provided, so we'll assume that the benchmark only runs in a JavaScript environment.

**Test Cases**

### Switch

The "Switch" test case uses a `switch` statement to access the value of `str`. The `switch` statement takes two arguments: the expression to be evaluated and a series of cases to check. If the expression matches any of the cases, the corresponding code is executed.

```javascript
switch (str) {
  case 'a':
    return 'a';
  case 'b':
    return 'b';
  case 'c':
    return 'c';
}
```

### Object

The "Object" test case uses an object literal to access the value of `str`. The syntax is:

```javascript
var objLiteral = {
  a: 'a',
  b: 'b',
  c: 'c'
}

objLiteral[str];
```

This will return the value associated with the key specified by `str`.

**Pros and Cons**

Here are some pros and cons of each approach:

**Switch**

Pros:

* Simple and straightforward syntax
* Easy to read and understand

Cons:

* Can be slower than object literal access due to the overhead of executing a block of code for each case
* May not work as expected if the cases are not exhaustive (e.g., if `str` is not one of 'a', 'b', or 'c')

**Object**

Pros:

* Faster than switch statement access, since it's just a simple property access
* Can handle non-exhaustive cases without issues

Cons:

* More verbose syntax
* May require more memory to store the object literal

**Other Considerations**

* Both approaches assume that `str` is a string value. If `str` can be a different type (e.g., number, boolean), additional checks may be needed.
* The benchmark does not account for the possibility of `str` being null or undefined.

**Libraries and Special JS Features**

This benchmark does not use any external libraries. However, it's worth noting that some JavaScript engines may optimize object literal access differently than others (e.g., using a caching mechanism).

There are no special JS features used in this benchmark.

**Alternatives**

Some alternative approaches to compare in this benchmark could include:

* Using a lookup table or array to store the values instead of an object literal
* Using a ternary operator (`str === 'a' ? 'a' : str === 'b' ? 'b' : 'c';`) instead of a switch statement
* Using a different data structure, such as a hash table or a map

Related benchmarks:

Switch vs Object (Simplified) (version: 0)

Comparing performance of: Switch vs Object

Created: one year ago by: Guest

Jump to the latest result

Switch

Object

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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