Benchmark: Delete Pair vs Create New Dict

HTML Preparation code:

Object

Script Preparation code:

var obj = {
  a:1,
  b:2,
  c:3,
  d:4,
  e:5,
  f:6,
  g:7,
  h:8,
  i:9,
  j:10
}

Tests:

delete
for (var key in obj) { delete obj[key]; }
create/assign dict
obj = {};

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
delete
create/assign dict

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared options, pros and cons of each approach, and other considerations.

**Benchmark Definition**

The benchmark is designed to compare two approaches:

1. **Delete Pair**: This involves deleting individual properties from an object using a `for` loop with `in` keyword.
2. **Create New Dict**: This involves creating a new empty dictionary (object in JavaScript) instead of modifying the existing one.

**Options Compared**

The benchmark compares the performance of these two approaches:

* **Delete Pair**: This approach uses the `delete` operator to remove properties from the object, iterating over each property using the `for...in` loop.
* **Create New Dict**: This approach creates a new empty dictionary (`obj = {}`) and assigns it to a variable, effectively replacing the original object.

**Pros and Cons**

* **Delete Pair**:
	+ Pros:
		- Modifies the existing object in-place, reducing memory allocation.
		- Can be more efficient for large objects with many properties.
	+ Cons:
		- Requires iterating over each property using `for...in`, which can lead to slower performance due to the overhead of iteration.
		- May not be suitable for objects where property names are dynamically generated or unpredictable.
* **Create New Dict**:
	+ Pros:
		- Creates a new object without modifying the original one, reducing potential side effects.
		- Can be faster for small objects with few properties due to reduced iteration overhead.
	+ Cons:
		- Allocates new memory for the new object, increasing memory pressure.
		- May not be suitable for large objects or performance-critical applications.

**Other Considerations**

* The benchmark assumes that the original object is not modified elsewhere in the codebase. If modifications are expected, the `Delete Pair` approach may be more suitable.
* The benchmark does not consider potential differences in memory allocation patterns between JavaScript engines (e.g., V8, SpiderMonkey).
* The benchmark does not take into account any potential caching or optimization techniques that might affect performance.

**Library and Special JS Features**

In this benchmark, no libraries are used explicitly. However, the `for...in` loop is a built-in JavaScript feature used to iterate over object properties.

**Other Alternatives**

For large objects, other approaches might include:

* **Using `Object.keys()` and `forEach()`**: This method iterates over property names using an array, which can be more efficient than `for...in`.
* **Using a custom iterator**: Writing a custom iterator function to iterate over the object's properties can provide better control over iteration and potentially improve performance.

Keep in mind that these alternatives may introduce additional complexity or overhead, so it's essential to evaluate their suitability for specific use cases.

Related benchmarks:

Delete Pair vs Create New Dict (version: 0)

Comparing performance of: delete vs create/assign dict

Created: 4 years ago by: Guest

Jump to the latest result

delete

create/assign dict

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):