Benchmark: For loop var i init hoisted or in parenthesis

Script Preparation code:

var arr = ["asd","244","4443","2356","4826374","248","asd","244","4443","2356","4826374","248","asd","244","4443","2356","4826374","asd","244","4443","2356","4826374","248"];
function hoisted() {
  var i=0;
  for(;i<arr.length;i++) {
    var temp = i;
  }
}
function inparens() {
  for(var i=0;i<arr.length;i++) {
    var semp = i;
  }
}

Tests:

Hoisted
hoisted();
inparens
inparens();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Hoisted
inparens

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 8 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.75 Safari/537.36

Browser/OS: Chrome 50 on Mac OS X 10.11.6

View result in a separate tab

Test name	Executions per second
Hoisted	405731.8 Ops/sec
inparens	408452.9 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to help you understand what's being tested in this JavaScript benchmark.

**Benchmark Definition**

The benchmark definition is provided as a JSON object, which describes the test case:

1. **For loop var i init hoisted or in parenthesis**: This is the main idea behind the benchmark. It tests how JavaScript handles variables declared inside a for loop when it comes to scoping and initialization.
2. **Script Preparation Code**: The script preparation code provides the necessary setup for the test, including declaring an array `arr` and two functions: `hoisted()` and `inparens()`. Both functions contain a for loop with variable declarations.

**Options Being Compared**

The benchmark compares two options:

1. **Hoisted**: This option uses the traditional JavaScript syntax where the variable is declared before the for loop, without parentheses.
2. **In Parentheses**: This option uses the syntax where the variable is declared inside the parentheses of the for loop declaration.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

1. **Hoisted**:
	* Pros: This is the traditional way of declaring variables in JavaScript, which is widely supported.
	* Cons: In modern browsers, this syntax can lead to "hoisting" issues, where variable declarations are moved to the top of their scope, potentially causing unexpected behavior.
2. **In Parentheses**:
	* Pros: This syntax provides better scoping and avoids hoisting issues, making it a safer choice for complex codebases.
	* Cons: This syntax is less familiar to many JavaScript developers and may require more work to implement.

**Library**

There is no explicit library mentioned in the benchmark definition. However, if we look at the individual test cases, we can see that `hoisted()` and `inparens()` are functions declared inside the script preparation code. These functions do not rely on any external libraries.

**Special JS Feature or Syntax**

This benchmark does not use any special JavaScript features or syntax beyond the traditional for loop declaration.

**Other Alternatives**

If you want to explore alternative approaches, here are a few options:

1. **Arrow Functions**: Instead of using traditional function declarations, you could use arrow functions to simplify variable declarations.
2. **Let and Const**: Modern JavaScript also supports `let` and `const` declarations, which provide better scoping and avoid hoisting issues.
3. **Modern Browsers**: You could test how modern browsers handle these variables in different execution contexts, such as async/await or Web Workers.

Keep in mind that these alternatives might not be directly relevant to the specific benchmark, but they can provide additional insights into JavaScript's capabilities and nuances.

Related benchmarks:

For loop var i init hoisted or in parenthesis (version: 3)

Comparing performance of: Hoisted vs inparens

Created: 8 years ago by: Registered User

Jump to the latest result

Hoisted

inparens

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):