Benchmark: Compare comparison with null or undefined. With typeof

Compare comparison with null or undefined. With typeof (version: 0)

Comparing performance of: value == null vs value == undefined vs value === null vs value === undefined vs value === null || value === undefined vs _.isNil(value) vs value != null vs value != undefined vs value !== null vs value !== undefined vs value !== null && value !== undefined vs !_.isNil(value)

Created: one year ago by: Guest

Jump to the latest result

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>

Script Preparation code:

var value = { a: 123 }

Tests:

value == null
value == null
value == undefined
typeof value === "undefined"
value === null
value === null
value === undefined
value === undefined
value === null || value === undefined
value === null || value === undefined
_.isNil(value)
_.isNil(value)
value != null
value != null
value != undefined
typeof value !== "undefined"
value !== null
value !== null
value !== undefined
value !== undefined
value !== null && value !== undefined
value !== null && value !== undefined
!_.isNil(value)
!_.isNil(value)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
value == null
value == undefined
value === null
value === undefined
value === null \|\| value === undefined
_.isNil(value)
value != null
value != undefined
value !== null
value !== undefined
value !== null && value !== undefined
!_.isNil(value)

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36

Browser/OS: Chrome 118 on Linux

View result in a separate tab

Test name	Executions per second
value == null	11302197.0 Ops/sec
value == undefined	11262906.0 Ops/sec
value === null	11257614.0 Ops/sec
value === undefined	3906272.8 Ops/sec
value === null \|\| value === undefined	2896185.2 Ops/sec
_.isNil(value)	3814302.5 Ops/sec
value != null	11328180.0 Ops/sec
value != undefined	11185611.0 Ops/sec
value !== null	11271581.0 Ops/sec
value !== undefined	3950024.2 Ops/sec
value !== null && value !== undefined	2939169.2 Ops/sec
!_.isNil(value)	3801553.2 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents a JavaScript microbenchmarking test case, which compares different approaches to check if an object is null or undefined. The test is run in multiple browsers and devices.

**Options Compared**

There are three main options compared:

1. **Direct Comparison (e.g., `value == null`)**: This approach uses the strict equality operator (`===`) to check if a value is equal to another value, specifically `null`.
2. **Type Checking (e.g., `typeof value === "undefined"`)**: This approach checks the type of an object using the `typeof` operator and compares it with `"undefined"` to determine if it's null or undefined.
3. **Library-Provided Functions (e.g., `_isNil(value)`)**: In this case, a library function from Lodash is used to check if an object is null or undefined.

**Pros and Cons of Each Approach**

1. **Direct Comparison (`value == null`)**:
	* Pros: Simple, fast, and well-supported by most browsers.
	* Cons: Can be vulnerable to subtle issues due to the strict equality operator's behavior with NaN values, etc.
2. **Type Checking (`typeof value === "undefined"`)**:
	* Pros: More accurate than direct comparison for checking null/undefined, but can introduce unnecessary type checks.
	* Cons: May not work as expected in some cases (e.g., when `value` is a complex object with an `undefined` property).
3. **Library-Provided Functions (`_isNil(value)`)**:
	* Pros: More accurate and robust than direct comparison or type checking, especially for handling edge cases.
	* Cons: Requires the inclusion of the Lodash library, which may not be desirable in all situations.

**Benchmark Results**

The benchmark results show that:

1. Direct comparison (`value == null`) performs well but has some issues with accuracy (e.g., `value === null` vs. `value != null`).
2. Type checking (`typeof value === "undefined"`) is more accurate than direct comparison, especially for handling null/undefined values.
3. Library-provided functions (`_isNil(value)` and other variants) consistently outperform both direct comparison and type checking, with minimal overhead due to the library's optimization.

**Conclusion**

This benchmark highlights the importance of choosing the right approach when working with JavaScript objects that may be null or undefined. While direct comparison can work well in many cases, it's essential to consider the pros and cons of each approach and choose the one that best suits your use case. The use of library-provided functions like `_isNil(value)` can provide an accurate and robust solution while minimizing the risk of subtle issues.

Related benchmarks:

Compare comparison with null or undefined. With typeof (version: 0)

Created: one year ago by: Guest

Jump to the latest result

value == null

value == undefined

value === null

value === undefined

value === null || value === undefined

_.isNil(value)

value != null

value != undefined

value !== null

value !== undefined

value !== null && value !== undefined

!_.isNil(value)

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):