What are some examples of wrappers in programming?

What are some examples of wrappers in programming?

In programming, wrappers are used to encapsulate functionality. For example, a common wrapper is a function that takes another function as an argument, allowing you to add additional behavior.

Can you give me a specific example of a wrapper in JavaScript?

Sure! In JavaScript, you can create a wrapper function that logs the execution time of another function. Here's a simple example:

function timeLogger(fn) {
    return function(...args) {
        const start = performance.now();
        const result = fn(...args);
        const end = performance.now();
        console.log(`Execution time: ${end - start} ms`);
        return result;
    };
}

const wrappedFunction = timeLogger(someFunction);
wrappedFunction();

What about wrappers in Python?

In Python, you can use decorators as wrappers. For instance, you can create a decorator that modifies the behavior of a function:

def my_decorator(func):
    def wrapper():
        print("Something is happening before the function is called.")
        func()
        print("Something is happening after the function is called.")
    return wrapper

@my_decorator
def say_hello():
    print("Hello!")

say_hello()