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check property exists {} vs Object.create(null)
(version: 3)
check property exists {} vs Object.create(null)
Comparing performance of:
{} vs null
Created:
2 years ago
by:
Registered User
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Tests:
{}
const y = ["asdfadf", "asdfasdf", "asdf3432wsfs", "sadf343sadfga", "asdfaw343fhsdgf", "asdfhgsd34dsgsdf", "asdfsd", "sfawe", "asdfasd3r4rq2f", "asdfad3f", "asdfas5df", "asdf34332wsfs", "sadf34223sadfga", "asdfaw343fh5sdgf", "asdfhgxdsd34dsgsdf", "asdf34ssd", "sggfawe", "asdfasd3r4rq2f"]; const x = ["asdfadf", "asdfasdf", "asdf3432wsfs", "sadf343sadfga", "asdfaw343fhsdgf", "asdfhgsd34dsgsdf", "asdfsd", "sfawe", "asdfasd3r4rq2f"]; const o = x.reduce((acc, key) => ((acc[key]=null), acc), {}); const a = []; for (const k of x) { if (k in o) { a.push(k); } }
null
const y = ["asdfadf", "asdfasdf", "asdf3432wsfs", "sadf343sadfga", "asdfaw343fhsdgf", "asdfhgsd34dsgsdf", "asdfsd", "sfawe", "asdfasd3r4rq2f", "asdfad3f", "asdfas5df", "asdf34332wsfs", "sadf34223sadfga", "asdfaw343fh5sdgf", "asdfhgxdsd34dsgsdf", "asdf34ssd", "sggfawe", "asdfasd3r4rq2f"]; const x = ["asdfadf", "asdfasdf", "asdf3432wsfs", "sadf343sadfga", "asdfaw343fhsdgf", "asdfhgsd34dsgsdf", "asdfsd", "sfawe", "asdfasd3r4rq2f"]; const o = Object.freeze(x.reduce((acc, key) => ((acc[key]=null), acc), Object.create(null))); const a = []; for (const k of x) { if (k in o) { a.push(k); } }
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Suite status:
<idle, ready to run>
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Test case name
Result
{}
null
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark and explain what's being tested, compared, and their pros and cons. **Benchmark Definition** The benchmark compares two approaches to check if a property exists in an object: 1. **Approach 1: `in` operator with an empty object `{}`** 2. **Approach 2: `Object.create(null)`** **Approach 1: `in` operator with an empty object `{}`** This approach uses the `in` operator to check if a property exists in the object. An empty object `{}` is used as the container. Pros: * Simple and straightforward implementation * Fast, as it only requires a simple lookup Cons: * May be slower than other approaches for large datasets due to the overhead of creating an empty object * Does not account for the fact that objects are dense, meaning that many properties may be present in the same memory location **Approach 2: `Object.create(null)`** This approach uses `Object.create(null)` to create a new object with no prototype. The idea is to avoid any potential overhead of creating an empty object. Pros: * Avoids the overhead of creating an empty object * May be faster for large datasets, as it avoids the dense property issue Cons: * More complex implementation compared to Approach 1 * Not all browsers support `Object.create(null)`, which may affect performance **Other considerations** The benchmark also uses a similar approach for constructing the object, using the `reduce` method and an initial value of `{}`. This is done to ensure that both approaches are tested with the same setup. **Library usage** None of the test cases use any external libraries or dependencies. **Special JavaScript features/syntax** There are no special JavaScript features or syntax used in these benchmark tests. **Benchmark results** The latest benchmark result shows two executions, one for each approach. The execution time and number of executions per second are not provided, but they can be inferred from the `ExecutionsPerSecond` values. In this case, Approach 1 (`in` operator with an empty object `{}`) seems to perform slightly better than Approach 2 (`Object.create(null)`), possibly due to the overhead of creating and managing objects in modern browsers. However, the actual performance difference may depend on various factors, including the specific use case and browser version. **Alternatives** Other approaches for checking if a property exists in an object include: 1. Using `hasOwnProperty` method: `o.hasOwnProperty(key)` 2. Using `in` operator with a different container, such as an array or a Map 3. Using a custom implementation that uses bit manipulation to check for property existence These alternatives may have their own pros and cons, depending on the specific use case and performance requirements.
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