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Object addition - checking for existence
(version: 0)
Comparing performance of:
Set New, No Check vs Set New, Check vs Set Existing, No Check vs Set Existing, Check
Created:
4 years ago
by:
Registered User
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Script Preparation code:
var obj = { "one": null, "two": null, }
Tests:
Set New, No Check
obj["three"] = null;
Set New, Check
if (obj["three"] !== undefined) { obj["three"] = null; }
Set Existing, No Check
obj["two"] = null;
Set Existing, Check
if (obj["two"] !== undefined) { obj["two"] = null; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
Set New, No Check
Set New, Check
Set Existing, No Check
Set Existing, Check
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):
Let's break down the provided benchmark and its options. **Benchmark Overview** The benchmark measures how fast different browsers can perform object addition operations with checks for existence. There are four test cases: 1. `Set New, No Check`: Sets a new property on an object without checking if it already exists. 2. `Set New, Check`: Sets a new property on an object while checking if the property already exists. 3. `Set Existing, No Check`: Sets an existing property of an object to null without checking if it already exists. 4. `Set Existing, Check`: Sets an existing property of an object to null while checking if the property already exists. **Options Compared** The options being compared are the two approaches for setting a new property on an object: 1. **Direct Assignment (`obj["three"] = null;`)**: This approach sets a new property directly without any checks. 2. **Property Check and Assignment (`if (obj["three"] !== undefined) { obj["three"] = null; }`)**: This approach first checks if the property exists before setting it to null. **Pros and Cons of Each Approach** 1. **Direct Assignment (`obj["three"] = null;`)`: * Pros: + Faster, as it directly sets the property without any checks. * Cons: + May lead to unexpected behavior if the property does not exist. 2. **Property Check and Assignment (`if (obj["three"] !== undefined) { obj["three"] = null; }`)**: * Pros: + Safer, as it prevents unexpected behavior by checking for existence before setting the property. * Cons: + Slower, as it requires an additional check. **Library and Special JS Feature** There is no specific library mentioned in the benchmark. However, the `obj` object is used throughout all test cases, which suggests that it's a simple JavaScript object. As for special JS features, there are none explicitly mentioned or used in this benchmark. **Other Alternatives** If you were to modify this benchmark to include additional options, some possible alternatives could be: * Using a more complex data structure, such as an array or a nested object. * Introducing random or varying inputs (e.g., different property names or values). * Adding more browsers or devices to the test cases. * Incorporating additional checks or optimizations (e.g., using `in` operator instead of bracket notation). Keep in mind that these modifications would require careful consideration of the resulting benchmark's accuracy, relevance, and scalability.
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instanceof vs hasOwnProperty
instanceof vs hasOwnProperty2
null vs. typeof vs. in vs. hasOwnProperty
hasOwn vs hasOwnProperty vs typeof
in vs Object.hasOwn vs Object.prototype.hasOwnProperty
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