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new class from fn vs function returning obj from fn 2
(version: 0)
Measure the performance of instanceOf operator vs comparing a basic string type.
Comparing performance of:
new class vs new fn
Created:
2 years ago
by:
Registered User
Go to the latest result
HTML Preparation code:
<script> class TestClass { constructor() { this.a = 2; this.t = 'mesh'; } } function TestFn(){ return { a:2, t:'mesh' }; } </script>
Tests:
new class
var obj = new TestClass()
new fn
var obj = TestFn()
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
new class
new fn
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36
Browser/OS:
Chrome 117 on Linux
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=524763" width="100%" height="500px"></iframe>
new class
14.2M/s
new fn
9.9M/s
View exact numbers
Test name
Executions per second
✓
new class
14,204,040 Ops/sec
new fn
9,910,564 Ops/sec
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 the pros and cons of each approach. **Benchmark Definition** The benchmark defines two test cases: 1. `new class from fn vs function returning obj from fn 2` 2. `Measure the performance of instanceOf operator vs comparing a basic string type.` **Test Cases** There are two individual test cases: 1. `var obj = new TestClass()` 2. `var obj = TestFn()` Let's analyze each test case and compare them. **Test Case 1: New Class (`var obj = new TestClass()`)** In this test case, an instance of the `TestClass` class is created using the `new` keyword. **Pros:** * More explicit and readable way to create a new object. * Allows for more control over the object's creation process (e.g., initialization, prototype chain). **Cons:** * May be slower due to the overhead of creating an instance and setting its properties. * Can lead to more complex code if not used carefully. **Test Case 2: Function Returning Object (`var obj = TestFn()`)** In this test case, a function `TestFn` returns an object directly. This is similar to using the `new` keyword, but with a twist: * The function returns an existing object (not a new one), which can be more efficient. * The code is concise and easy to read. **Pros:** * More efficient way to create objects, as it avoids the overhead of creating a new instance. * Can lead to better performance, especially in complex scenarios where multiple objects are created. **Comparison** The benchmark is comparing the performance of using the `new` keyword (`var obj = new TestClass()`) versus returning an object directly from a function (`var obj = TestFn()`). The goal is to measure which approach is faster and more efficient. **Library and Special JS Features** In this benchmark, no libraries are used, and there are no special JavaScript features being tested. However, it's worth noting that the `instanceof` operator is being compared with a basic string comparison. **Instance of Operator** The `instanceof` operator checks whether an object is an instance of a given constructor function. In this benchmark, it's being used to compare the performance of creating instances using `new`. **Other Alternatives** If you're interested in alternative ways to create objects or compare their creation: 1. **Using constructors**: Instead of `new`, you can use the `TestClass` function directly to create a new object. ```javascript var obj = TestClass(); ``` This approach is often used with object literals, where no explicit constructor function is defined. 2. **Using prototypal inheritance**: You can define an object using the `Object.create()` method and set its prototype chain to the desired class. ```javascript function TestFn() { return Object.create(TestClass.prototype); } var obj = TestFn(); ``` This approach allows for more control over the object's inheritance hierarchy. 3. **Using a factory function**: Instead of returning an existing object, you can create a new one using a factory function that returns an instance of the desired class. ```javascript function TestFn() { return Object.assign({}, TestClass()); } var obj = TestFn(); ``` This approach allows for more flexibility in creating objects and can be useful in certain scenarios.
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