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Strict equality VS typeof
(version: 0)
Comparing performance of:
Strict equality vs Typeof
Created:
7 years ago
by:
Registered User
Go to the latest result
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>
Run tests (2)
Previous results
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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
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=497041" width="100%" height="500px"></iframe>
Strict equality
19.3M/s
Typeof
18.3M/s
View exact numbers
Test name
Executions per second
✓
Strict equality
19,328,202 Ops/sec
Typeof
18,311,820 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
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.
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