Benchmark: dynamic create object vs array

Tests:

dynamic create object integer value
var object = {}; object["p1"] = 1; object["p2"] = 2; object["p3"] = 3; object["p4"] = 4; object["p5"] = 5; object["p6"] = 6; object["p7"] = 7; object["p8"] = 8; object["p9"] = 9;
dynamic create array integer value
var array = []; array.push("p1",1); array.push("p2",2); array.push("p3",3); array.push("p4",4); array.push("p5",5); array.push("p6",6); array.push("p7",7); array.push("p8",8); array.push("p9",9);
dynamic create object string value
var object = {}; object["p1"] = "1"; object["p2"] = "2"; object["p3"] = "3"; object["p4"] = "4"; object["p5"] = "5"; object["p6"] = "6"; object["p7"] = "7"; object["p8"] = "8"; object["p9"] = "9";
dynamic create array string value
var array = []; array.push("p1",1); array.push("p2",2); array.push("p3",3); array.push("p4",4); array.push("p5",5); array.push("p6",6); array.push("p7",7); array.push("p8",8); array.push("p9",9);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
dynamic create object integer value
dynamic create array integer value
dynamic create object string value
dynamic create array string value

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**Benchmark Definition**

The benchmark is designed to measure the performance difference between creating objects and arrays using dynamic property assignment. The test cases are identical, except for the type of values being assigned: integers or strings.

**Options Compared**

Two approaches are compared:

1. **Dynamic Object Creation**: Creating an object using the `object` keyword and assigning properties dynamically using bracket notation (`object["pX"] = value;`).
2. **Dynamic Array Creation**: Creating an array using the `array` keyword and pushing elements onto it dynamically using the `push()` method (`array.push("pX", value);`).

**Pros and Cons of Each Approach**

1. **Dynamic Object Creation**
	* Pros:
		+ Can be more readable and maintainable, as properties are assigned explicitly.
		+ Allows for easy iteration over object properties using bracket notation.
	* Cons:
		+ May incur a performance overhead due to the need for lookup and assignment.
2. **Dynamic Array Creation**
	* Pros:
		+ Typically faster than dynamic object creation, as arrays can be allocated in bulk.
		+ Can take advantage of caching and optimized array allocation mechanisms.
	* Cons:
		+ Requires explicit indexing or iteration over elements using `push()`.

**Library and Purpose**

There are no external libraries used in the benchmark. However, the `Array.prototype.push()` method is a part of the JavaScript language standard.

**Special JS Feature/ Syntax (None)**

No special JavaScript features or syntax are used in this benchmark.

**Other Considerations**

When writing performance-critical code, it's essential to consider the trade-offs between readability, maintainability, and optimization. In general:

* Dynamic object creation can be more readable and maintainable for large datasets, as properties can be assigned explicitly.
* Dynamic array creation is typically faster for large datasets, but may incur additional overhead due to indexing or iteration.

**Alternative Benchmarks**

Other alternatives for measuring performance differences between dynamic object and array creation include:

1. **Using a testing library**: Utilize libraries like Benchmark.js or Microbenchmark to create more complex and realistic benchmarks.
2. **Measuring memory allocation and deallocation**: Measure the number of allocations and deallocations required for each approach to understand their impact on memory management.
3. **Comparing compile-time optimizations**: Compare the performance of dynamically created objects and arrays with pre-compiled versions, such as those generated by just-in-time (JIT) compilers.

These alternative approaches can provide more comprehensive insights into the performance characteristics of dynamic object and array creation, but may require additional setup and configuration.

Latest run results:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Browser/OS: Chrome 67 on Mac OS X 10.11.6

View result in a separate tab

Test name	Executions per second
dynamic create object integer value	734201728.0 Ops/sec
dynamic create array integer value	16573828.0 Ops/sec
dynamic create object string value	162379056.0 Ops/sec
dynamic create array string value	18225588.0 Ops/sec

Related benchmarks:

dynamic create object vs array (version: 3)

Comparing performance of: dynamic create object integer value vs dynamic create array integer value vs dynamic create object string value vs dynamic create array string value

Created: 8 years ago by: Registered User

Jump to the latest result

dynamic create object integer value

dynamic create array integer value

dynamic create object string value

dynamic create array string value

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):