Benchmark: const within vs outside a function

Script Preparation code:

var strToConvert = "yr89vi083hf*/:<>?\\|*/:<>?\\|*/:<>?\\|*/:<>?\\|*/:<>?\\|*/:<>?\\|984hijhfgvjhngkjqherkjfherh";

String.prototype.constWithin=function(o,e){
  const HW='"*/:<>?\\|',FW='＂＊／：＜＞？＼＼｜',FC=String.fromCharCode;
  return Array.prototype.reduce.call(this,
           o && Object.hasOwn(o,"char") && (e=o.char, !0) ? (r,c) => r + (HW.includes(c)?e:c)                         :
           o?.reverse                                     ? (r,c) => r + (FW.includes(c)?FC(c.charCodeAt(0)-65248):c) :
                                                            (r,c) => r + (HW.includes(c)?FC(c.charCodeAt(0)+65248):c) ,
         "")
}

{
  const HW='"*/:<>?\\|',FW='＂＊／：＜＞？＼＼｜',FC=String.fromCharCode;
  String.prototype.constOutside=function(o,e){
    return Array.prototype.reduce.call(this,
             o && Object.hasOwn(o,"char") && (e=o.char, !0) ? (r,c) => r + (HW.includes(c)?e:c)                         :
             o?.reverse                                     ? (r,c) => r + (FW.includes(c)?FC(c.charCodeAt(0)-65248):c) :
                                                              (r,c) => r + (HW.includes(c)?FC(c.charCodeAt(0)+65248):c) ,
           "")
  }
}

Tests:

const within function
strToConvert.constWithin()
const outside function
strToConvert.constOutside()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
const within function
const outside function

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser/OS: Chrome 121 on Windows

View result in a separate tab

Test name	Executions per second
const within function	96278.4 Ops/sec
const outside function	96929.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition and explain what's being tested, compared, and other considerations.

**Benchmark Definition:**

The provided JSON represents two individual test cases, each representing a JavaScript microbenchmark. The benchmarks are:

1. `strToConvert.constWithin()`: Tests the performance of a custom `constWithin` method within a function.
2. `strToConvert.constOutside()`: Tests the performance of a custom `constOutside` method outside a function.

**Script Preparation Code:**

The script preparation code defines two custom string prototype methods:

1. `String.prototype.constWithin(function, variable)`: A method that iterates over each character in the input string and appends either the original character or a constant value (`e`) if it matches a specific pattern (`HW`).
2. `String.prototype.constOutside()`: A method similar to `constWithin`, but without the function parameter.

**Options Compared:**

The two methods differ only in their behavior when called outside of a function:

1. `constWithin()`:
	* When called within a function, it behaves as described above.
	* When called outside a function, it returns an empty string (`""`).
2. `constOutside()`: Always returns an empty string (`""`), regardless of whether it's called inside or outside a function.

**Pros and Cons:**

1. **constWithin()`**:
	* Pros: Allows for flexibility in when the constant value is applied, which might be useful in certain scenarios.
	* Cons: Can lead to unexpected behavior if not used correctly, as the constant value is only applied within a specific context.
2. **constOutside()**:
	* Pros: Provides a clear and predictable behavior regardless of where it's called from.
	* Cons: Might be less flexible than `constWithin()` in certain situations.

**Library Usage:**

There are no libraries mentioned in the provided code snippets, so there is nothing to describe regarding library usage.

**Special JS Feature/Syntax:**

The only special syntax used here is the use of `String.prototype` and JavaScript's object prototype methods (e.g., `Array.prototype.reduce()`). These are standard JavaScript features and do not require any specific knowledge or expertise.

**Other Alternatives:**

For comparison, other alternatives to these custom string prototype methods could include:

1. Using built-in JavaScript functions like `Array.prototype.forEach()` or `String.prototype.replace()`.
2. Implementing a character-level iteration using `for` loops and conditional statements.
3. Utilizing a library like Lodash, which provides an `isEqual` function for comparing values.

Keep in mind that the choice of implementation depends on the specific requirements and constraints of your use case.

Related benchmarks:

const within vs outside a function (version: 0)

Comparing performance of: const within function vs const outside function

Created: 2 years ago by: Registered User

Jump to the latest result

const within function

const outside function

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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