Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
type of object
(version: 0)
Comparing performance of:
typeof vs equality check
Created:
2 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var x = { a: 2, b: 3 }
Tests:
typeof
typeof x === 'object'
equality check
Object(x) === x
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
typeof
equality check
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what is being tested in the provided JSON benchmark. **Benchmark Definition** The benchmark definition provides information about the type of object being measured, which is `var x = { a: 2, b: 3 }`. This means that the benchmark is testing the performance of JavaScript code related to object types. **Options Compared** There are two options being compared in this benchmark: 1. **`typeof x === 'object'`**: This option tests whether the result of the `typeof` operator on the variable `x` returns `'object'`. 2. **`Object(x) === x`**: This option tests whether the equality between calling the `Object()` constructor on `x` and assigning it to a variable `x`. **Pros and Cons** 1. **`typeof x === 'object'`**: * Pros: Simple, easy to understand, and fast. * Cons: May not be accurate for all object types (e.g., arrays or functions). 2. **`Object(x) === x`**: * Pros: More accurate than `typeof` for determining if an object is of type `'object'`. * Cons: Can be slower due to the overhead of calling a function. **Library and Purpose** The `Object()` constructor is used to test whether `x` is an object. In JavaScript, `Object()` can be called with an argument to return a new object with the specified properties. This allows the benchmark to determine if `x` has been properly assigned as an object. **Special JS Feature or Syntax** There are no special JS features or syntax mentioned in this benchmark. However, it's worth noting that modern JavaScript engines often use techniques like Just-In-Time (JIT) compilation and optimization to improve performance. This benchmark may not reflect these optimizations, but it can still provide valuable insights into the underlying language implementation. **Other Alternatives** If you want to test different aspects of object type checking or equality checks in JavaScript, here are some alternative benchmarks you could consider: * Testing `Object.prototype.toString.call(x)` instead of `typeof x` * Comparing the performance of `JSON.stringify(x) === JSON.stringify(y)` versus `x === y` * Examining the impact of using `instanceof` to check if an object is of a specific class These alternative benchmarks can help you further understand the nuances of JavaScript's type checking and equality checks.
Related benchmarks:
Variable assignment from object | traditional vs destructuring
variable assignment
object destruction vs. dot notation 2
instanceof vs number
Comments
Confirm delete:
Do you really want to delete benchmark?