Benchmark: switch vs dict - MeasureThat.net

Tests:

switch
function call() { let a = 'test' switch (a) { case 'test1': return 'ni'; case 'asdgsa': return 'sdfsd'; case 'test': return 'ok'; default: return; } } call();
dict
function call() { let a = 'test' let dict={ 'test1':'ni', 'asdgsa':'sdfsd', 'test':'ok' } return dict[a] } call();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
switch
dict

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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I'll explain the provided benchmark and its test cases in detail.

**Benchmark Definition**

The provided JSON defines two benchmark tests: `switch` and `dict`. The `Name`, `Description`, `Script Preparation Code`, and `Html Preparation Code` fields are all empty, indicating that no specific script or HTML setup is required for these benchmarks. This suggests that the focus is on comparing the performance of the JavaScript `switch` statement with a dictionary lookup.

**Test Cases**

There are two test cases:

1. **Switch Test**
The first test case defines a function named `call()` that uses a `switch` statement to return different values based on the value of variable `a`. The `switch` statement has three cases: `'test1'`, `'asdgsa'`, and `'test'`. If none of these cases match, the `default` clause returns an empty string.
2. **Dictionary Test**
The second test case defines a function named `call()` that uses a dictionary (`dict`) to look up a value based on the value of variable `a`. The dictionary has three entries: `'test1'`: `'ni'`, `'asdgsa'`: `'sdfsd'`, and `'test'`: `'ok'`.

**Options Compared**

The benchmark compares the performance of two approaches:

1. **Switch Statement**: The first test case uses a traditional `switch` statement to determine the value to return.
2. **Dictionary Lookup**: The second test case uses a dictionary to look up the value based on the variable `a`.

**Pros and Cons of Each Approach**

**Switch Statement:**

Pros:

* Can be more readable and maintainable for certain use cases, especially when dealing with simple cases or small ranges of values.
* Can be optimized by the JavaScript engine, depending on the specific implementation.

Cons:

* Can be slower than dictionary lookups for larger ranges of values or when the number of cases is large.
* Can lead to more complex code and harder-to-maintain when dealing with multiple cases.

**Dictionary Lookup:**

Pros:

* Generally faster than switch statements, especially for larger ranges of values or when the number of cases is high.
* More flexible and easier to maintain when dealing with dynamic data or large amounts of data.

Cons:

* Can be less readable and more complex than switch statements, especially when dealing with small ranges of values or simple cases.
* May require more memory to store the dictionary.

**Library and Purpose**

In this benchmark, there is no specific library used. However, JavaScript engines like V8 (used by Chrome) and SpiderMonkey (used by Firefox) may optimize or implement certain features that could affect the performance of these benchmarks.

**Special JS Feature/Syntax**

There are no special JS features or syntax mentioned in the provided benchmark definition. The focus is on comparing two different approaches to achieve a specific goal.

**Alternative Approaches**

Other alternatives for achieving similar results might include:

* Using an array or object with multiple properties and checking if `a` matches any of them.
* Implementing a custom lookup function using a hash table or other data structure.
* Utilizing the JavaScript engine's built-in functions, such as `Array.prototype.includes()` or `Object.prototype.hasOwnProperty()`, to perform lookups.

Note that these alternatives might have different performance characteristics, readability, and maintainability compared to the switch statement and dictionary lookup approaches.

Related benchmarks:

switch vs dict (version: 0)

Comparing performance of: switch vs dict

Created: 3 years ago by: Guest

Jump to the latest result

switch

dict

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):