Benchmark: fedfadsfdsfadfdsfasf

Script Preparation code:

var obj = {};
for(i=0; i<1000; i++){obj[i+" item"]=true;};

Tests:

in
var a = ("999 item" in obj);
hasownproperty
var a = obj.hasOwnProperty("999 item");
loop
for(var key in obj){if(key=="999 item"){var a = true;break;}};

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
in
hasownproperty
loop

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

I'll break down the provided JSON data and explain what's being tested, compared, and considered.

**Benchmark Definition**

The benchmark definition is represented by two types of test cases:

1. **In operator (`"999 item" in obj`)**: This test case checks how fast the browser can perform a lookup using the `in` operator on an object.
2. **hasOwnProperty method (`obj.hasOwnProperty("999 item")`)**: This test case evaluates how quickly a browser can check if a property exists in an object using the `hasOwnProperty` method.
3. **Loop-based comparison (`for(var key in obj){if(key=="999 item"){var a = true;break;}}`)**: This test case measures how fast a browser can iterate over an object's properties and compare them to a specific value.

**Comparison Options**

The three test cases are being compared across various browsers. The options being compared include:

* **In operator vs. hasOwnProperty method**: Both methods are used to check if a property exists in an object. However, the `in` operator is often considered faster because it's a built-in language feature that can perform the lookup without creating a new object.
* **Loop-based comparison vs. built-in methods**: The loop-based approach requires iterating over all properties of the object and comparing them to the target value. In contrast, using `hasOwnProperty` or the `in` operator provides a more direct and efficient way to check for property existence.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

* **In operator (`"999 item" in obj`)**:
	+ Pros: Fastest, often considered most accurate.
	+ Cons: May not work as expected with certain data structures or objects (e.g., arrays with prototype chains).
* **hasOwnProperty method (`obj.hasOwnProperty("999 item")`)**:
	+ Pros: More predictable behavior, works well with arrays and objects that use prototype chaining.
	+ Cons: May be slower than the `in` operator for simple lookups.
* **Loop-based comparison (`for(var key in obj){if(key=="999 item"){var a = true;break;}}`)**:
	+ Pros: Can handle complex data structures, but may be slower and more memory-intensive.

**Library Usage**

None of the test cases use external libraries. The `in` operator, `hasOwnProperty`, and loop-based comparison rely on built-in JavaScript features.

**Special JS Features or Syntax**

There is no special JavaScript feature or syntax used in these test cases. They are standard, core language features that can be executed by most modern browsers.

**Alternatives**

Some alternative approaches to measure the performance of property existence checks include:

* Using a data structure like a hash table or a trie, which would allow for fast lookups and comparisons.
* Implementing a custom search algorithm using bitwise operations or bitwise masking.
* Measuring the performance of different data structures or algorithms that can be used to optimize object lookup.

However, these alternative approaches may not be directly comparable to the provided test cases, as they require significant modifications to the benchmark definition and implementation.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0

Browser/OS: Firefox 67 on Windows

View result in a separate tab

Test name	Executions per second
in	160129008.0 Ops/sec
hasownproperty	153580912.0 Ops/sec
loop	384670.6 Ops/sec

Related benchmarks:

fedfadsfdsfadfdsfasf (version: 0)

Comparing performance of: in vs hasownproperty vs loop

Created: 5 years ago by: Guest

Jump to the latest result

in

hasownproperty

loop

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):