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Object Property x Local Variable Accessing
(version: 0)
Comparing performance of:
Object Property vs Local Variable
Created:
7 years ago
by:
Guest
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Tests:
Object Property
class Bar { constructor() { this.prop = { foo: function() { console.log('foo!') } } } test() { if(this.prop.foo) { this.prop.foo() } } } const b = new Bar() b.test()
Local Variable
class Bar { constructor() { this.prop = { foo: function() { console.log('foo!') } } } test() { const foo = this.prop.foo if(foo) { foo() } } } const b = new Bar() b.test()
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Object Property
Local Variable
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36 Edg/139.0.0.0
Browser/OS:
Chrome 139 on Windows
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<iframe src="https://measurethat.net/Embed?id=614961" width="100%" height="500px"></iframe>
Object Property
214K/s
Local Variable
202K/s
View exact numbers
Test name
Executions per second
✓
Object Property
213,632 Ops/sec
Local Variable
201,926 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what is being tested. **Benchmark Purpose** The provided benchmark tests two different approaches to accessing properties of objects in JavaScript: using a local variable (direct property access) versus accessing through an object property. **Options Compared** 1. **Local Variable**: The first approach uses a local variable `foo` to store the value of `this.prop.foo`. This means that the code is accessing the `foo` function as if it were a standalone variable, rather than a method on the `prop` object. 2. **Object Property**: The second approach accesses the `foo` function directly through the `this.prop` object. **Pros and Cons** * **Local Variable Approach**: + Pros: May be faster since it avoids the overhead of method calls and property lookups (if the property exists). + Cons: May not work as expected if the code relies on the `foo` function being a part of the `prop` object's prototype chain. * **Object Property Approach**: + Pros: More intuitive and expressive, as it clearly conveys the intention of accessing a method through an object property. + Cons: May be slower due to the overhead of property lookups (if the property exists). In general, the choice between these approaches depends on the specific use case and performance requirements. **Library Usage** There is no explicit library usage in this benchmark. However, it's worth noting that some JavaScript engines may have optimizations or behaviors related to object property access that could impact the results of this benchmark. **Special JS Features/Syntax** This benchmark does not use any special JavaScript features or syntax beyond standard ES6+ language features. **Alternative Approaches** If you want to explore alternative approaches, consider the following: 1. **Property Destructuring**: Instead of using a local variable, you could use property destructuring (`const { foo } = this.prop;`) to access the `foo` function directly. 2. **Proxy Manipulation**: If you need more control over the access mechanism, you could use Proxies (introduced in ES6+) to manipulate the object property access. 3. **Function Caching**: If performance is critical, you might consider caching the result of the `this.prop.foo()` call using a technique like memoization or function caching. Keep in mind that these alternatives may introduce additional complexity and overhead, so they should be used judiciously depending on your specific requirements.
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