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Iterate object
(version: 0)
Iterate object
Comparing performance of:
prop not declared vs prop declared
Created:
9 years ago
by:
Guest
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HTML Preparation code:
<html> <head></head> <body> <script type="text/javascript"> var doc = new Document({width: 50, height: 50}); </script> </body> </html>
Script Preparation code:
var Document = function(Config) { this.config = { width: "auto", height: "auto" }; this.init(Config); };
Tests:
prop not declared
Document.prototype.init = function(Config) { var config = this.config; if(typeof Config == "object") { for(prop in Config) { if(config.hasOwnProperty(prop)) this.config[prop] = Config[prop]; } } };
prop declared
Document.prototype.init = function(Config) { var config = this.config; if(typeof Config == "object") { for(var prop in Config) { if(config.hasOwnProperty(prop)) this.config[prop] = Config[prop]; } } };
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
prop not declared
prop declared
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Overview** The provided benchmark measures the performance of JavaScript objects in iterating over properties, specifically focusing on whether the property is declared or not. **Options Compared** There are two options being compared: 1. **Variable Declaration**: Two variants: * `var prop in Config` (Test Case: "prop not declared") * `var prop in Config` with a declaration (`let` or `const`, assuming they're equivalent to `var`) - however, this is not the exact option being tested as declared variables are skipped in ECMAScript 6. Hence it's more like `var` keyword only which in modern browsers behave same way as `let`. 2. **Using `hasOwnProperty()`**: Both tests use this method. **Pros and Cons** * Using `in` operator (both variants): + Pros: Simple, easy to read. + Cons: Performance may vary depending on browser implementation. * Using `hasOwnProperty()`: + Pros: More accurate when checking if the property is owned by the object. + Cons: May introduce additional overhead due to the method call. **Library and Purpose** No external libraries are used in this benchmark. The `Document` class is a custom class created for this benchmark, with an `init()` method that demonstrates the iteration over properties using both options. **Special JS Feature or Syntax** The benchmark does not utilize any special JavaScript features or syntax beyond what's currently supported in modern browsers (ECMAScript 6 and later). **Other Alternatives** If you wanted to explore other approaches for iterating over object properties, consider: 1. **Using `for...in` loop**: Similar to using the `in` operator, but can be more readable. 2. **Using `Object.keys()` and a `forEach` loop**: A more modern approach, utilizing the `keys` method of objects. 3. **Using `Map` or `Set` data structures**: Depending on your use case, these may offer better performance for iterating over properties. Keep in mind that benchmarking performance can be complex, and results may vary depending on browser implementation, hardware, and other factors.
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