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instanceof vs number
(version: 0)
Comparing performance of:
instanceof vs number
Created:
2 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var obj = {a:2};
Tests:
instanceof
obj instanceof Object
number
obj.a === 2
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
instanceof
number
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 months ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36
Browser/OS:
Chrome 140 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=629061" width="100%" height="500px"></iframe>
number
43.3M/s
instanceof
42.7M/s
View exact numbers
Test name
Executions per second
✓
number
43,332,064 Ops/sec
instanceof
42,727,792 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks. **Benchmark Definition** The provided JSON represents a benchmark definition, which outlines the test case and its requirements. In this case, there are two test cases: 1. `instanceof vs number`: This test case compares the performance of using `instanceof` versus comparing with a literal value (`===`) to check if an object is equal to a certain property value. 2. The second test case has no description or preparation code, but its benchmark definition is `obj instanceof Object`, which tests whether the `instanceof` operator returns true for the given object. **Options Compared** In the first test case, two approaches are compared: 1. `typeof obj === "object"` (not shown in the JSON, but assumed) 2. `obj instanceof Object` The pros and cons of these approaches are: * `typeof obj === "object"`: + Pros: This method is concise and easy to read. + Cons: It can return false positives if the object's constructor is not a function (e.g., `new Date()`). * `obj instanceof Object`: + Pros: This method is more precise, as it only returns true for objects created using the `Object` constructor. + Cons: It may be slower due to the overhead of checking the prototype chain. **Library Used** In the second test case, no library is explicitly mentioned. However, since the test involves checking if an object is equal to a certain property value (`obj.a === 2`), it's likely that the `===` operator uses a internal method that checks the values using a library like ECMAScript. **Special JS Feature or Syntax** There are no special features or syntax used in these benchmark definitions. **Other Considerations** When writing microbenchmarks, consider the following: 1. **Use meaningful names**: Choose descriptive names for your test cases and variables to ensure readability. 2. **Keep it simple**: Avoid using complex logic or optimizations that might skew the results. 3. **Test a variety of scenarios**: Include different edge cases and corner cases to ensure robustness. 4. **Use precise data types**: Use `Number` instead of `Number` (with quotes) for numeric comparisons. **Alternatives** Some alternatives to MeasureThat.net include: 1. jsbench.org: A popular online platform for running JavaScript benchmarks. 2. JSHunter: A tool for optimizing JavaScript performance by analyzing execution patterns. 3. Benchmarking libraries like benchmarkjs or micro-benchmark, which provide a standardized way of writing and executing benchmarks. Keep in mind that the choice of benchmarking platform or library depends on your specific use case, requirements, and personal preferences.
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