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undefinedd
(version: 0)
Comparing performance of:
body.a === undefined vs body.b === undefined vs body.c === undefined vs typeof body.a === undefined vs typeof body.b === undefined vs typeof body.c === undefined
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var body = { a: 2, b: "string" };
Tests:
body.a === undefined
body.a === undefined
body.b === undefined
body.b === undefined
body.c === undefined
body.c === undefined
typeof body.a === undefined
typeof body.a === undefined
typeof body.b === undefined
typeof body.b === undefined
typeof body.c === undefined
typeof body.c === undefined
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (6)
Previous results
Fork
Test case name
Result
body.a === undefined
body.b === undefined
body.c === undefined
typeof body.a === undefined
typeof body.b === undefined
typeof body.c === undefined
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):
I'll break down the provided JSON and explain what's being tested, compared, and other considerations. **Benchmark Definition** The `Script Preparation Code` defines a JavaScript object `body` with two properties: `a` and `b`. Property `c` is not defined. This setup is likely intended to test how different browsers handle undefined properties in objects. **Individual Test Cases** Each test case uses a specific property of the `body` object and checks if it's `undefined`. The six test cases are: 1. `body.a === undefined` 2. `body.b === undefined` 3. `body.c === undefined` 4. `typeof body.a === undefined` 5. `typeof body.b === undefined` 6. `typeof body.c === undefined` These tests cover different aspects of object property checks and type conversions. **Library: None** The benchmark does not use any external libraries. **Special JS Features or Syntax: None** There are no special JavaScript features or syntax used in the benchmark. **Other Alternatives** If this benchmark were to be implemented using a different approach, alternatives might include: 1. Using `hasOwnProperty` instead of direct property checks (e.g., `body.hasOwnProperty('a') === undefined`). 2. Using `Object.keys()` and checking if the resulting array includes the property name (e.g., `Object.keys(body).includes('a') === undefined`). 3. Testing with a different data structure, such as an array or a set. However, these alternatives might not provide identical results, so they are not considered direct equivalents of the original benchmark. **Pros and Cons of Different Approaches** Here's a brief summary: * Direct property checks (`body.a === undefined`, `typeof body.a === undefined`): Simple and straightforward, but may be slower due to the overhead of comparing values. * Using `hasOwnProperty`: May provide better performance for objects with many properties, as it avoids unnecessary iterations. * Using `Object.keys()` and checking if the resulting array includes the property name: May be slower due to the overhead of creating an array, but can be more readable. Overall, the original benchmark provides a clear and concise way to test object property checks and type conversions.
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