Benchmark: set value if non existent

Script Preparation code:

self.attributeHandler = {}
self.initialValue = 123

Tests:

ternary
attributeHandler.default = 'default' in attributeHandler ? attributeHandler.default : initialValue
if
if (!('default' in attributeHandler)) attributeHandler.default = initialValue

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
ternary
if

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.0

Browser/OS: Chrome 120 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
ternary	5733707.0 Ops/sec
if	17097682.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its associated JSON data.

**Benchmark Overview**

The provided benchmark tests two different ways of setting a default value if it doesn't exist in an object, specifically using JavaScript's ternary operator or an `if` statement with conditional assignment. The test aims to compare the performance difference between these two approaches on modern JavaScript engines.

**Test Cases**

There are two individual test cases:

1. **Ternary**: This test case uses the ternary operator (`?:`) to set the default value if it doesn't exist in the `attributeHandler` object.
```javascript
attributeHandler.default = 'default' in attributeHandler ? attributeHandler.default : initialValue
```
2. **If**: This test case uses an `if` statement with conditional assignment to set the default value if it doesn't exist in the `attributeHandler` object.
```javascript
if (!('default' in attributeHandler)) attributeHandler.default = initialValue
```
**Library and Purpose**

Neither of these test cases explicitly uses a library. The code snippets are simple JavaScript expressions, so they don't require any external dependencies.

**Special JS Features or Syntax**

Both test cases use a relatively modern feature: the ternary operator (`?:`). This operator was introduced in ECMAScript 2015 (ES6) and provides a concise way to express conditional statements.

**Pros and Cons of Each Approach**

1. **Ternary Operator**:
	* Pros:
		+ More concise and readable code.
		+ Expresses the intent clearly, making it easier for others to understand.
	* Cons:
		+ May be less efficient due to the need to evaluate both conditions (true and false).
2. **If Statement with Conditional Assignment**:
	* Pros:
		+ Can be more efficient since only one condition needs to be evaluated.
	* Cons:
		+ Less readable code compared to the ternary operator.
		+ Requires explicit assignment, which can make it harder to understand the intent.

**Other Considerations**

When comparing these two approaches, consider the following:

* Performance: The `if` statement with conditional assignment might be slightly faster due to the reduced number of evaluations. However, this difference is likely to be negligible in most cases.
* Readability and Maintainability: The ternary operator is generally more readable and maintainable since it clearly expresses the intent.

**Alternative Approaches**

Other ways to set a default value if it doesn't exist in an object include:

* Using the `||` operator (logical OR): `attributeHandler.default = attributeHandler.default || initialValue`
* Using the `in` operator with `??` (optional chaining): `attributeHandler.default ?? initialValue`

While these alternatives might be more concise, they might not offer significant performance improvements over the original approaches.

In conclusion, the provided benchmark compares two common ways of setting default values in JavaScript using ternary operators and `if` statements. The choice between these approaches depends on a balance between readability, maintainability, and potential performance considerations.

Related benchmarks:

set value if non existent (version: 0)

Comparing performance of: ternary vs if

Created: 2 years ago by: Guest

Jump to the latest result

ternary

if

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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