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Compare typeof vs null check
(version: 0)
Comparing performance of:
Is number vs Is null
Created:
4 years ago
by:
Guest
Go to the latest result
Script Preparation code:
const value = null
Tests:
Is number
const value = null return typeof value === 'number'
Is null
const value = null return value == null
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Is number
Is null
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/131.0.0.0 Safari/537.36
Browser/OS:
Chrome 131 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=576930" width="100%" height="500px"></iframe>
Is number
60.7M/s
Is null
40.4M/s
View exact numbers
Test name
Executions per second
✓
Is number
60,732,252 Ops/sec
Is null
40,370,204 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what is being tested in the provided JSON data. **Benchmark Definition** The benchmark definition is comparing two approaches to check if a value is `null` or not: 1. Using `typeof` operator with `null`: `const value = null; return typeof value === 'number'` 2. Direct equality check using `==` operator: `const value = null; return value == null` **Pros and Cons of Each Approach** 1. **Using `typeof` operator**: * Pros: + More explicit and clear intention + Less prone to errors due to type coercion * Cons: + May be slower or more computationally expensive due to the extra operation 2. **Direct equality check using `==` operator**: * Pros: + Typically faster or more efficient, as it's a direct comparison without additional operations * Cons: + More prone to errors due to type coercion (e.g., comparing a number with a string) + Less readable and maintainable due to the potential for subtle bugs **Other Considerations** Both approaches have their trade-offs. In general, `typeof` is considered more reliable and safer when working with values that may be unexpectedly coerced during comparisons. **Library Usage** There is no explicit library mentioned in the provided data. However, some libraries like `lodash` or `assert` might provide functions that could be used for these types of checks. **Special JS Features/Syntax** None are explicitly mentioned in this example. **Other Alternatives** For similar benchmarks, you might consider: * Using `instanceof` operator to check if a value is an instance of `Number` * Utilizing the `is-null` library (e.g., `npm install is-null`) for more explicit null checks * Comparing the performance of other operators like `===` or `!=`
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