Benchmark: in vs hasOwnProperty vs bool vs typeof vs hasOwn

Script Preparation code:

var pages = {
    "0-0": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-1": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-2": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-3": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-4": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-5": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-6": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-7": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-8": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-9": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-10": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-11": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-12": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-13": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-14": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-15": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-16": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-17": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-18": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-19": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-20": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-21": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-22": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] },
    "0-23": { "programs": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] }
}

Tests:

in
"0-12" in pages
hasOwnProperty
pages.hasOwnProperty("0-12")
hasOwn
Object.hasOwn(pages, "0-12")
bool
!!pages["0-12"]
typeof
typeof pages["0-12"] !== "undefined"

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
in
hasOwnProperty
hasOwn
bool
typeof

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is testing four different ways to check if a key exists in an object: `in`, `hasOwnProperty`, `hasOwn`, and `!!`. The `!!` operator is used to convert the result of the expression to a boolean value.

**Individual Test Cases**

There are four test cases, each representing one of the four methods:

1. **"0-12" in pages**: This test case uses the `in` operator to check if the key "0-12" exists in the `pages` object.
2. **`pages.hasOwnProperty("0-12")`**: This test case uses the `hasOwnProperty` method of the `pages` object to check if the key "0-12" is a direct property of the object.
3. **`Object.hasOwn(pages, "0-12")`**: This test case uses the `hasOwn` method of the `Object` class to check if the key "0-12" exists in the `pages` object as a direct property.
4. **`!!pages["0-12"]`**: This test case uses the `!!` operator to convert the result of accessing the key "0-12" in the `pages` object to a boolean value (true if the key exists, false otherwise).

**Test Results**

The latest benchmark results show that:

* The `typeof` method is the fastest (executions per second: 33384584.0)
* The `!!` operator is almost as fast as `typeof` (executions per second: 33215608.0)
* The `bool` test case (using the `!!` operator) is slower than the top two (executions per second: 24228030.0 and 10034139.0)
* The `hasOwnProperty` method is slower than the `in` operator (executions per second: 33340628.0 vs. 33384584.0)
* The `hasOwn` method is the slowest (executions per second: 10034139.0)

**What's being tested**

The benchmark is testing the performance of four different methods for checking if a key exists in an object. The results show that the `in` operator and the `!!` operator are relatively fast, while the `hasOwnProperty` method and the `hasOwn` method are slower. This suggests that the `in` operator and the `!!` operator are more efficient ways to check for key existence in objects.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36

Browser/OS: Chrome 117 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
in	33215608.0 Ops/sec
hasOwnProperty	24228030.0 Ops/sec
hasOwn	10034139.0 Ops/sec
bool	33340628.0 Ops/sec
typeof	33384584.0 Ops/sec

Related benchmarks:

in vs hasOwnProperty vs bool vs typeof vs hasOwn (version: 0)

Comparing performance of: in vs hasOwnProperty vs hasOwn vs bool vs typeof

Created: one year ago by: Guest

Jump to the latest result

in

hasOwnProperty

hasOwn

bool

typeof

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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