Benchmark: arr.includes vs obj.hasOwnProperty

Script Preparation code:

var arr = []
var obj = {}

for (let i = 0; i < 1001; i++) {
  const lol = i.toString()
  arr.push(lol)
  obj[lol] = true
}

Tests:

arr
arr.includes("1000") === true
obj
obj.hasOwnProperty("1000") === true

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
arr
obj

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.

I'll break down the provided JSON benchmark definition and test cases to explain what's being tested, compared, and considered.

**Benchmark Definition:**

The benchmark measures the performance difference between two JavaScript methods:

1. `arr.includes()` (for arrays)
2. `obj.hasOwnProperty()` (for objects)

These two methods are used for membership testing in arrays and objects, respectively.

**Script Preparation Code:**

The script generates an array `arr` and an object `obj` with 1001 elements each, where the element values are strings created from numbers using `i.toString()`. This creates a large dataset to test performance.

**Html Preparation Code:**

There is no HTML preparation code provided for this benchmark.

**Test Cases:**

The benchmark has two individual test cases:

1. **arr**: Tests the performance of `arr.includes("1000") === true`.
2. **obj**: Tests the performance of `obj.hasOwnProperty("1000") === true`.

These test cases measure the execution time of these membership tests for both arrays and objects.

**Options Compared:**

The benchmark compares two options:

1. Using `includes()` on an array (`arr.includes()`).
2. Using `hasOwnProperty()` on an object (`obj.hasOwnProperty()`).

**Pros and Cons:**

Here are some pros and cons of each option:

**`arr.includes()`**

Pros:

* Widely supported by most browsers and engines.
* Simple and concise syntax.

Cons:

* Can be slower than `hasOwnProperty()` for large datasets, as it uses a linear search algorithm.
* Does not provide any information about the element's existence in the array.

**`obj.hasOwnProperty()`**

Pros:

* More efficient for large datasets, as it uses a hash table lookup.
* Provides accurate results for membership testing.

Cons:

* Less widely supported by older browsers and engines.
* Requires access to the object's prototype chain.
* Syntax can be less concise than `includes()`.

**Other Considerations:**

When choosing between these two options, consider the following factors:

* Dataset size: For very large datasets, `hasOwnProperty()` might be faster.
* Browser support: If you need to support older browsers, `includes()` might be a better choice.
* Readability and maintainability: Choose the option that best fits your coding style.

**Library/Language Features:**

There is no specific library or language feature being tested in this benchmark. However, it's worth noting that some modern JavaScript engines, like V8 (used by Chrome), have optimized `includes()` for performance.

**Special JS Feature/Syntax:**

No special JavaScript features or syntax are being used in this benchmark. The code uses standard JavaScript constructs and methods (`includes()`, `hasOwnProperty()`, arrays, objects, loops).

In conclusion, this benchmark measures the performance difference between using `arr.includes()` and `obj.hasOwnProperty()` for membership testing in arrays and objects, respectively. The results can help developers understand which method to use depending on their specific use case and requirements.

Related benchmarks:

arr.includes vs obj.hasOwnProperty (version: 0)

arr.includes vs obj.hasOwnProperty

Comparing performance of: arr vs obj

Created: 7 years ago by: Guest

Jump to the latest result

arr

obj

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):