Benchmark: For in vs Object.keys.asdasdasdasdasd

Script Preparation code:

var obj = new Object()
var keys = (new Array(100)).fill(0).map((x, i) => { return i + 1 })
keys.forEach((x) => { obj['prop' + x] = x })

Tests:

For In
for (var key in obj) { if (obj.hasOwnProperty(key)) console.log(obj[key]) }
Object keys forEach
for (var key of Object.keys(obj)) { if (obj.hasOwnProperty(key)) console.log(obj[key]) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
For In
Object keys forEach

Fastest: N/A

Slowest: N/A

Latest run results:

No previous 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 definition and test cases to understand what's being tested.

**Benchmark Definition JSON**

The first part of the JSON represents the overall benchmark, which includes:

*   "Name": A unique name for the benchmark, in this case, "For in vs Object.keys.asdasdasdasdasd".
*   "Description": An optional description of the benchmark, which is empty here.
*   "Script Preparation Code": This is a JavaScript code snippet that's executed before running each test. In this case, it creates an object `obj` and populates its properties with numbers from 1 to 100 using a loop.

**Individual Test Cases**

The second part of the JSON represents individual test cases:

*   Each test case has a unique "Test Name" (e.g., "For In", "Object keys forEach").
*   The "Benchmark Definition" field contains the actual JavaScript code being executed for each test. There are two test cases here:
    *   "for (var key in obj) {\r\n  if (obj.hasOwnProperty(key)) console.log(obj[key])\r\n}" This is a traditional `for...in` loop that iterates over an object's properties.
    *   "for (var key of Object.keys(obj)) {\r\n  if (obj.hasOwnProperty(key)) console.log(obj[key])\n}" This is using the `Object.keys()` method to get an array of an object's property keys, and then iterating over this array.

**Pros and Cons of Different Approaches**

Here's a brief analysis of each approach:

*   **Traditional For...In Loop**: 
    *   Pros: More human-readable and easier to understand, especially for those familiar with classic JavaScript.
    *   Cons: Can be slower than other approaches due to the overhead of checking `hasOwnProperty()` on each property.
*   **Object.keys()**:
    *   Pros: Generally faster since it doesn't require a separate `hasOwnProperty()` check and is more lightweight.
    *   Cons: Less intuitive for some developers, especially those without prior experience with modern JavaScript features.

**Library Used (if any)**

None of the benchmark test cases explicitly use any external libraries.

**Special JS Features or Syntax**

There are no special features or syntax used in these benchmark test cases. Both approaches are standard and widely supported JavaScript features.

**Other Alternatives**

Some possible alternatives to improve or extend this benchmark could be:

*   Using modern JavaScript features like `for...of` loops with `Object.entries()` instead of traditional `for...in`.
*   Incorporating additional objects or arrays to test for performance in scenarios like nested data structures.
*   Adding tests for edge cases, such as very large datasets.

Keep in mind that these alternatives would require modifications to the benchmark definition and preparation code.

Related benchmarks:

For in vs Object.keys.asdasdasdasdasd (version: 0)

Comparing performance of: For In vs Object keys forEach

Created: 6 years ago by: Guest

Jump to the latest result

For In

Object keys forEach

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):