Benchmark: Strict equality VS typeof

Script Preparation code:

var bool = false;

Tests:

Strict equality
bool === null
Typeof
typeof bool === 'boolean'

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Strict equality
Typeof

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Linux

View result in a separate tab

Test name	Executions per second
Strict equality	19328202.0 Ops/sec
Typeof	18311820.0 Ops/sec

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.

**Benchmark Definition:**
The benchmark is comparing two approaches to check if a variable is of type `boolean`: strict equality (`===`) versus using the `typeof` operator with `'boolean'`.

**Script Preparation Code:**
The script starts by setting a variable `bool` to `false`.

**Html Preparation Code:** (empty)
There's no HTML code provided for preparation, so we can assume it's not relevant to this specific benchmark.

**Individual Test Cases:**
We have two test cases:

1. "Strict equality" (`bool === null`): This test case is checking if the strict equality operator (`===`) returns true when comparing `bool` with `null`.
2. "Typeof" (`typeof bool === 'boolean'`): This test case is checking if the `typeof` operator returns `'boolean'` when evaluating `bool`.

**Libraries and Special JS Features:**
There are no libraries explicitly mentioned, but we can assume that the JavaScript engine being tested supports the `typeof` operator.

**Pros and Cons of Different Approaches:**

* **Strict Equality (`===`)**:
	+ Pros: Fast and straightforward. It's a simple way to check if two values have the same value and type.
	+ Cons: Can lead to subtle bugs if not used carefully, as it doesn't perform a loose equality check like `==`.
* **Typeof Operator with `'boolean'`:**
	+ Pros: More robust than strict equality for checking types. It performs a loose equality check and can handle cases where `bool` might be converted to a boolean value (e.g., using `Boolean(bool)`).
	+ Cons: Slower than strict equality, as it involves a function call.

**Considerations:**

* When working with primitive values like booleans, strict equality (`===`) is often sufficient and faster.
* However, when dealing with more complex data structures or conversions, the `typeof` operator might be a better choice for ensuring type correctness.

**Other Alternatives:**
For additional testing or verification, you could consider using other methods to check if a value is of type `boolean`, such as:

* Using the `instanceof` operator (`bool instanceof Boolean`) to check if `bool` is an instance of the `Boolean` constructor.
* Implementing a custom function or helper to verify the type of a value.

Keep in mind that these alternatives might not be necessary for this specific benchmark, but they could provide additional insights into the performance and behavior of different approach.

Related benchmarks:

Strict equality VS typeof (version: 0)

Comparing performance of: Strict equality vs Typeof

Created: 6 years ago by: Registered User

Jump to the latest result

Strict equality

Typeof

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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