Benchmark: Stringify vs full compare

Script Preparation code:

window.tests = []
let a,b,c,d,e,f,g,h,j,k;
for(let i = 0; i < 100; i++){
  a = b = c = d = e = f = g = h = j = k = i;
  window.tests[i] = {hello: "sunshine", a,b,c,d,e,f,g,h,j,k};
}

a = b = c = d = e = f = g = h = j = k = 50;
window.objTest = {hello: "sunshine", a,b,c,d,e,f,g,h,j,k};

function miniFullCompare(A,B){
  let misses = 0;
  for(let a of Object.keys(A))
    A[a] !== B[a] && (misses[i]++);
  return misses;
}

Tests:

stringify test obj 10
const jsonTest = JSON.stringify(objTest); const res = tests.map(test => JSON.stringify(test) === jsonTest);
obj compare
const res = tests.map(test => miniFullCompare(test, objTest));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
stringify test obj 10
obj compare

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Linux; Android 10; GM1901) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Mobile Safari/537.36

Browser/OS: Chrome Mobile 87 on Android

View result in a separate tab

Test name	Executions per second
stringify test obj 10	6069.7 Ops/sec
obj compare	979.8 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

**Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks, comparing different approaches for string comparison and object equality.

**Benchmark Definition JSON**

The provided benchmark definition json contains two test cases:

1. "Stringify vs full compare": This test case compares the performance of two string comparison methods:
	* `JSON.stringify()` method
	* Custom `miniFullCompare()` function that performs a full comparison of two objects (not just strings)
2. Individual test cases: These are smaller tests that measure the performance of specific string comparison or object equality scenarios.

**String Comparison Methods**

The benchmark defines two string comparison methods:

1. **`JSON.stringify()` method**: This method converts the input string to a JSON-formatted string and then compares it with another string. It's not suitable for comparing strings in JavaScript because it:
	* Adds quotes around the string
	* Escapes special characters (e.g., `\n`, `\t`)
	* Converts whitespace to spaces
	* May return different results due to browser differences in handling Unicode escape sequences
2. **`miniFullCompare()` function**: This custom function performs a full comparison of two objects by iterating over each property and checking if they are equal using the `===` operator. It's more efficient than `JSON.stringify()` but may be slower for very large objects due to the iteration.

**Pros and Cons**

1. **`JSON.stringify()` method**:
	* Pros: Simple, fast (in theory), easy to implement
	* Cons: Not suitable for string comparison in JavaScript, can produce different results due to browser differences, escapes special characters
2. **`miniFullCompare()` function**:
	* Pros: More accurate for object equality comparisons, handles whitespace and Unicode escape sequences correctly
	* Cons: Slower than `JSON.stringify()`, may be slower for very large objects due to iteration

**Library Used**

The benchmark uses the `JSON` library, which is a built-in JavaScript library that provides functions for working with JSON data.

**Special JS Features/Syntax**

None mentioned in the provided benchmark definition json.

**Alternative Approaches**

Other alternative approaches for string comparison and object equality could include:

1. Using the `===` operator directly on strings (without quotes or escaping)
2. Using a library like Lodash's `isEqual()` function
3. Implementing a custom string comparison algorithm, such as using regular expressions

Keep in mind that each approach has its pros and cons, and the best choice depends on the specific use case and performance requirements.

Related benchmarks:

Stringify vs full compare (version: 0)

Comparing performance of: stringify test obj 10 vs obj compare

Created: 4 years ago by: Registered User

Jump to the latest result

stringify test obj 10

obj compare

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):