Benchmark: Object value comparison vs array of object value comparison with different loops v1

Script Preparation code:

var items = Array.from(Array(1000), (_, x) => ({
    key: x,
    value1: Math.random() * 1000,
    value2: Math.random() * 1000
}));

var objContainer = {};
var arrContainer = [];

for (let i = 100; i >= 0; i--) {
    const index = Math.floor(Math.random() * 1000);
    const item = items[index];
    objContainer[item.key] = item;
    arrContainer.push(item)
}

Tests:

Object, for-in
var result = []; for (var k in objContainer) { if (objContainer[k].value1 >= 0 && objContainer[k].value1 <= 499 && objContainer[k].value2 >= 500 && objContainer[k].value2 <= 999) { result.push(k); } }
Array, for-of
var result = []; for (var item of arrContainer) { if (item.value1 >= 0 && item.value1 <= 499 && item.value2 >= 500 && item.value2 <= 999) { result.push(item.key); } }
Object, for
var result = []; var keys = Object.keys(objContainer); for (var i = 0; i < keys.length; i++) { if (objContainer[keys[i]].value1 >= 0 && objContainer[keys[i]].value1 <= 499 && objContainer[keys[i]].value2 >= 500 && objContainer[keys[i]].value2 <= 999) { result.push(keys[i]); } }
Array, for
var result = []; for (var i = 0; i < arrContainer.length; i++) { if (arrContainer[i].value1 >= 0 && arrContainer[i].value1 <= 499 && arrContainer[i].value2 >= 500 && arrContainer[i].value2 <= 999) { result.push(arrContainer[i].key); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object, for-in
Array, for-of
Object, for
Array, for

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is being tested.

**Benchmark Definition**

The benchmark tests the speed of three different approaches to compare object values:

1. **Object, for-in**: Using the `for...in` loop to iterate over the object's properties (keys) and checking if a property value falls within a certain range.
2. **Array, for-of**: Using the `for...of` loop to iterate over an array of objects and extracting the key from each object using the `key` property.
3. **Object, for**: Using a traditional `for` loop to iterate over an array of keys and checking if each key's corresponding object value falls within the specified range.
4. **Array, for**: Using a traditional `for` loop to iterate over an array of objects and extracting the key from each object using the `key` property.

**Comparison**

The benchmark measures the execution speed of these four approaches on both object and array data structures. The results are presented in terms of "ExecutionsPerSecond", which indicates how many iterations (i.e., comparisons) can be performed within a second by each browser.

**Options Compared**

Here's a brief summary of each option:

1. **Object, for-in**: Iterates over object properties using `for...in`, which has the advantage of being concise but may also incur performance overhead due to property lookup.
2. **Array, for-of**: Uses a more modern and expressive loop syntax (`for...of`) to iterate over an array of objects. This approach is generally faster than traditional loops because it avoids unnecessary object creation and property access.
3. **Object, for**: Iterates over an array of keys using a traditional `for` loop, which can be less readable but may also perform better due to potential optimizations.
4. **Array, for**: Uses a traditional `for` loop to iterate over an array of objects, similar to the object iteration approach.

**Pros and Cons**

Here's a brief analysis of each approach:

1. **Object, for-in**:
	* Pros: Concise, easy to read.
	* Cons: May incur performance overhead due to property lookup.
2. **Array, for-of**:
	* Pros: More modern, expressive syntax; generally faster than traditional loops.
	* Cons: Requires support for `for...of` loop syntax in the browser engine.
3. **Object, for**:
	* Pros: May perform better due to potential optimizations.
	* Cons: Less readable, more verbose.
4. **Array, for**:
	* Pros: More traditional and familiar syntax; potentially optimized performance.
	* Cons: Less expressive or modern than other approaches.

**Other Considerations**

1. **Browser Support**: The benchmark only tests the four specified loops on Chrome 108, which may not be representative of all browsers or their versions.
2. **JavaScript Version**: No information is provided about the JavaScript version used in the benchmark, which might impact loop syntax and performance.
3. **Data Generation**: The benchmark uses a random array generation approach, which can lead to varying execution times depending on the data distribution.

**Alternatives**

If you're interested in exploring other approaches or optimizations for object comparison, consider:

1. Using `Map` data structures instead of objects or arrays, as they provide more efficient key-value lookups.
2. Leveraging browser-specific optimization techniques, such as using `WeakMap` or `Map.prototype.has()` to avoid unnecessary property checks.
3. Investigating third-party libraries or frameworks that specialize in performance-critical JavaScript optimizations.

Keep in mind that these alternatives might require additional setup and code modifications to work within your specific use case.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36

Browser/OS: Chrome 108 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Object, for-in	65288.6 Ops/sec
Array, for-of	4189983.0 Ops/sec
Object, for	63273.3 Ops/sec
Array, for	61496.4 Ops/sec

Related benchmarks:

Object value comparison vs array of object value comparison with different loops v1 (version: 1)

Test speed of object value comparison vs array of object value comparison with for-in, for-of, and for loops

Comparing performance of: Object, for-in vs Array, for-of vs Object, for vs Array, for

Created: one year ago by: Registered User

Jump to the latest result

Object, for-in

Array, for-of

Object, for

Array, for

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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