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new Function vs function
(version: 0)
Comparing performance of:
new Function vs regular
Created:
2 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var newFunc = new Function("return Math.random().toString(36).substring(7).includes('x');"); var regular = function(){ return Math.random().toString(36).substring(7).includes('x');; }
Tests:
new Function
newFunc();
regular
regular()
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
new Function
regular
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON data and explain what is being tested. **Benchmark Definition** The benchmark definition is comparing two approaches to creating a function in JavaScript: 1. **`new Function()`**: This approach creates a new function using the `Function` constructor, which takes a string argument containing the function body. 2. **`function(){...}`**: This approach creates an anonymous function using the `function` keyword followed by the function body. **Options Compared** The two approaches are being compared in terms of their performance, specifically the number of executions per second. **Pros and Cons** * **`new Function()`**: + Pros: Can be useful when you need to create a function dynamically based on user input or external data. + Cons: Can lead to security vulnerabilities if not sanitized properly (e.g., using user-provided input). * **`function(){...}`**: This is the traditional and recommended way of creating functions in JavaScript. It's faster, more readable, and provides better support for features like closures and binding. **Library and Purpose** There doesn't appear to be any external library being used in this benchmark. **Special JS Feature or Syntax** There are no special JavaScript features or syntax mentioned in the benchmark definition or test cases. However, it's worth noting that the `Function` constructor has some interesting properties and behaviors that can affect performance, such as: * **Caching**: The `Function` constructor caches the created function, which means that if you create multiple functions with the same code, they will share the same cache entry. * **Evaluation**: When you call a function created using `new Function()`, it is evaluated immediately, whereas functions created using the `function` keyword are only evaluated when called. **Other Alternatives** Some alternative approaches to creating functions in JavaScript include: * Using a library like `bind()` or `arrow functions` (introduced in ECMAScript 2015) to create functions with specific behavior. * Using a templating engine or string manipulation library to generate function code dynamically. * Implementing your own function factory pattern using a class or constructor function. In summary, the benchmark is testing two fundamental approaches to creating functions in JavaScript: `new Function()` and the traditional `function(){...}` syntax. The results will likely show that the latter approach is faster and more efficient.
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