Benchmark: Scoping test - MeasureThat.net

Tests:

1
var test = function test() { var x = 0; var nested= function() { for (var i=0; i< 1000000; i++) { x = x + Math.random(); } } nested(); }; test();
2
(function () { var x = 0; var nested= function() { var t = performance.now() console.log('start'); for (var i=0; i< 1000000; i++) { x = x + Math.random(); } console.log('finish: ' + (performance.now() - t)); } nested(); })();
3
(function test() { var x = 0; var nested= function() { for (var i=0; i< 1000000; i++) { x = x + Math.random(); } } nested(); })();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2
3

Fastest: N/A

Slowest: N/A

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

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**Overview of the Benchmark**

The provided benchmark tests the scoping behavior in JavaScript, specifically how it handles variable hoisting and scope resolution.

**Benchmark Definition JSON Explanation**

* The benchmark definition is a string that represents a JavaScript function or expression that creates variables with nested scopes. These variables are used to manipulate the value of `x` in a loop.
* There are three different approaches:
	1. **Function Expressions (IEFES)**: This approach uses a function expression (`var test = ...`) to define the scope of the variables.
	2. **Immediately Invoked Function Expression (IIFE)**: This approach uses an IIFE (`(function () { ... })()`) to create a new scope for the variables.
	3. **Anonamous Function Expressions**: This approach uses an anonymous function expression (`var nested = ...`).

**Comparison of Options**

* **Function Expressions (IEFES)**:
	+ Pros: More readable, easier to understand.
	+ Cons: Can lead to variable hoisting issues due to the way variables are declared and initialized in JavaScript.
* **Immediately Invoked Function Expression (IIFE)**:
	+ Pros: Creates a new scope for the variables, which can help avoid variable hoisting issues. Also, provides better isolation between different parts of the code.
	+ Cons: Can be less readable than function expressions due to the additional overhead of the IIFE syntax.
* **Anonamous Function Expressions**:
	+ Pros: Very concise and compact, but also harder to read and understand for some developers.
	+ Cons: Can lead to variable hoisting issues if not used carefully.

**Library Usage**

There is no explicit library usage in these benchmarks. However, the benchmark uses the `performance.now()` function to measure time, which is a built-in JavaScript function that returns the number of milliseconds since the Unix epoch (January 1, 1970).

**Special JS Features or Syntax**

The only special feature used here is the immediately invoked function expression (IIFE) syntax, which creates a new scope for the variables. This helps to avoid variable hoisting issues and provides better isolation between different parts of the code.

**Other Alternatives**

* **For Loops**: Instead of using a for loop with a large number of iterations, you could use an array or other data structure to repeat the execution.
* **Closures**: You could also create a closure by defining a function that captures the variables and uses them in its execution.

These alternatives can provide different insights into the performance characteristics of JavaScript code, but may not accurately represent real-world usage scenarios.

Related benchmarks:

Scoping test (version: 0)

Comparing performance of: 1 vs 2 vs 3

Created: 4 years ago by: Guest

Jump to the latest result

1

2

3

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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