Benchmark: validate undefined 3

Script Preparation code:

var data = { parentNode: true }

Tests:

data.parentNode
if (data.parentNode) { data.parentNode = true; }
data.parentNode !== undefined
if (data.parentNode !== undefined) { data.parentNode = true; }
data.parentNode != undefined
if (data.parentNode != undefined) { data.parentNode = true; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
data.parentNode
data.parentNode !== undefined
data.parentNode != undefined

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.129 Safari/537.36

Browser/OS: Chrome 81 on Windows

View result in a separate tab

Test name	Executions per second
data.parentNode	2849447.2 Ops/sec
data.parentNode !== undefined	1333065.6 Ops/sec
data.parentNode != undefined	1394175.6 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to explain what's being tested in the provided JSON benchmark.

**Benchmark Overview**

The benchmark is designed to measure the performance of JavaScript code that checks for the existence or value of the `parentNode` property of an object. The benchmark consists of three test cases:

1. `data.parentNode`
2. `data.parentNode !== undefined`
3. `data.parentNode != undefined`

These test cases are designed to check if the browser is able to optimize and execute JavaScript code quickly when checking for the existence or value of a property.

**Options Compared**

The options being compared in this benchmark are:

* Using the triple equals (`===`) operator for equality checks (`data.parentNode === true`)
* Using the double equals (`==`) operator for equality checks (`data.parentNode == true`)
* Using the not equal to (`!=`) operator for inequality checks (`data.parentNode != undefined`)

**Pros and Cons of Each Approach**

1. **Triple Equals (`===`) Operator**: This is the most modern and safe way to compare values in JavaScript. It checks both the value and type equality, which can prevent issues with type coercion.
	* Pros: Safe, explicit, and efficient.
	* Cons: May be slower than other approaches due to its additional type checking.
2. **Double Equals (`==`) Operator**: This operator performs type coercion, which means it tries to convert both operands to a common type before comparing them.
	* Pros: Fast, but may introduce type coercion issues if not used carefully.
	* Cons: Less safe and less explicit than triple equals.
3. **Not Equal To (`!=`) Operator**: This operator is similar to the double equals operator but checks for inequality instead of equality.
	* Pros: Faster than using `==` due to its simpler operation.
	* Cons: May still perform type coercion if not used carefully.

**Library and Special JavaScript Feature**

There are no libraries or special JavaScript features being tested in this benchmark. The code is simple and standard JavaScript.

**Considerations**

When writing JavaScript code, it's essential to consider the potential pitfalls of each operator:

* Using `===` for equality checks can prevent type coercion issues.
* Using `==` or `!=` may introduce type coercion issues if not used carefully.
* Always use consistent operators (either `===`, `==`, or `!=`) in a given codebase.

**Alternatives**

Other alternatives to measure JavaScript performance include:

* Checking for property existence using the `in` operator (`data.parentNode in data`)
* Using a library like Benchmark.js, which provides more features and flexibility than MeasureThat.net
* Creating custom microbenchmarks using a different programming language or toolchain.

Related benchmarks:

validate undefined 3 (version: 2)

Comparing performance of: data.parentNode vs data.parentNode !== undefined vs data.parentNode != undefined

Created: 4 years ago by: Registered User

Jump to the latest result

data.parentNode

data.parentNode !== undefined

data.parentNode != undefined

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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