Benchmark: Switch vs Object Literal for Values

Script Preparation code:

var str = 'abc';
str = str.charAt(Math.floor(Math.random() * 3));

var A = 'A';
var B = 'B';
var C = 'C';

function withSwitch(p) {
  switch (p) {
    case 'a': return A;
    case 'b': return B;
    case 'c': return C;
  }
}

const obj = {
  a: A,
  b: B,
  c: C
}

function withObj(p) {
  return obj[p]
}

Tests:

Switch
withSwitch(str)
Object Literal
withObj(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 its options.

**Benchmark Overview**

The benchmark, called "Switch vs Object Literal for Values," tests the performance of two different approaches to access values in an object:

1. `withSwitch(p)`: Uses a switch statement with multiple cases to access values.
2. `withObj(p)`: Uses object literals to access values.

**Script Preparation Code**

The script preparation code creates an array of three strings (`A`, `B`, and `C`) and assigns them to variables. It also defines two functions, `withSwitch` and `withObj`, which will be used in the benchmark.

The `withSwitch(p)` function uses a switch statement to return one of the strings based on the value of `p`. The `withObj(p)` function returns an object literal with the same values as the array.

**Benchmark Definition**

The benchmark definition consists of two test cases:

1. "Switch" (uses `withSwitch(str)`)
2. "Object Literal" (uses `withObj(str)`)

The benchmark is executed twice for each test case, with slightly different randomization to ensure that the results are not skewed by caching.

**Options Compared**

The two options being compared are:

1. `withSwitch(p)`: Uses a switch statement to access values.
2. `withObj(p)`: Uses object literals to access values.

**Pros and Cons of Each Approach**

* `withSwitch(p)`:
	+ Pros:
		- Can be faster for large numbers of cases (due to caching and optimized execution)
		- More intuitive for developers familiar with switch statements
	+ Cons:
		- May have slower performance for small numbers of cases (due to the overhead of the switch statement)
		- Less flexible than object literals
* `withObj(p)`.
	- Pros: 
		- Faster performance for large numbers of values (due to caching and optimized execution)
		- More flexible than switch statements, as it can handle arbitrary key-value pairs.
	+ Cons:
		- May be less intuitive for developers unfamiliar with object literals
		- Requires more memory to store the object

**Library/Function Used**

The `withSwitch(p)` function uses the built-in JavaScript `switch` statement. The `withObj(p)` function uses a simple object literal to store the values, which is also a built-in feature of JavaScript.

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

**Other Alternatives**

Some other alternatives for accessing values in an object could include:

* Using a lookup table or array to map keys to values
* Using a regular expression to extract values from a string
* Using a custom implementation, such as using a hash table or a trie

However, the switch statement and object literals are likely the most common and efficient approaches for this use case.

Related benchmarks:

Switch vs Object Literal for Values (version: 0)

Comparing performance of: Switch vs Object Literal

Created: 6 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):