Benchmark: conditional object creation vs let

Tests:

conditional create
if (typeof Obj !== "object") { var Obj = { "1": "one"}; }
let create
let Obj = { "1": "one"};

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
conditional create
let create

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Windows

View result in a separate tab

Test name	Executions per second
conditional create	1314975616.0 Ops/sec
let create	1333260288.0 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 benchmark and its test cases.

**Benchmark Overview**

The benchmark measures the performance difference between two approaches to creating objects in JavaScript: using a conditional statement with `typeof` to check if an object is already created, and using the `let` keyword to declare variables.

**Test Cases**

There are only two test cases:

1. **Conditional Object Creation**: The benchmark definition uses an `if-else` statement to create an object:
```javascript
if (typeof Obj !== "object") {
  var Obj = { "1": "one" };
}
```
This code checks if the variable `Obj` is not already an object using the `typeof` operator. If it's not, then it creates a new object with the specified properties.

2. **Let Variable Declaration**: The second test case uses the `let` keyword to declare a variable and create an object:
```javascript
let Obj = { "1": "one" };
```
This code declares a new variable `Obj` and assigns it an object with the specified properties. Note that this approach does not check if the variable already exists; instead, it simply re-declares it.

**Comparison of Approaches**

The two approaches differ in their behavior:

* **Conditional Object Creation**: This approach checks if an object is already created before declaring a new one. If the object already exists, it will reuse its existing properties.
* **Let Variable Declaration**: This approach always declares a new variable and creates a new object, regardless of whether the variable already exists.

**Pros and Cons**

Here are some pros and cons of each approach:

* **Conditional Object Creation**:
	+ Pros:
		- Reuses existing object properties if the variable already exists.
		- May be faster in some cases since it avoids re-declaring a new variable.
	+ Cons:
		- Can lead to unexpected behavior if the variable is not properly initialized.
		- May have performance implications due to the conditional check.
* **Let Variable Declaration**:
	+ Pros:
		- Easy to read and understand, as it explicitly declares a new variable.
		- Does not require any special checks or considerations.
	+ Cons:
		- Always re-declares the variable, which may lead to performance issues if the variable is large or complex.

**Library Considerations**

In this benchmark, there is no specific library mentioned. However, it's worth noting that some libraries (e.g., Lodash) provide utility functions for object creation and manipulation, such as `lodash.object.create()`.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax mentioned in this benchmark. The code uses basic JavaScript syntax and does not include any advanced features like async/await, promises, or closures.

**Alternative Approaches**

Other alternatives to these approaches could be:

* Using the `Object.create()` method to create a new object.
* Using a class declaration to define an object (e.g., using `class MyClass { ... }`).
* Using a library like Lodash's `_.create()` function to create a new object.

Keep in mind that each approach has its pros and cons, and the best choice depends on the specific use case and performance requirements.

Related benchmarks:

conditional object creation vs let (version: 0)

Comparing performance of: conditional create vs let create

Created: 2 years ago by: Guest

Jump to the latest result

conditional create

let create

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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