How To The Art of Morse Code Messaging

JavaScript is a versatile programming language that allows developers to create a wide range of applications. Sometimes, developers create code that seems puzzling at first glance, like the enigmatic JavaScript snippet you’ve shared:

_=_=>_(_);_(_)

In this article, we will explore the fascinating world of JavaScript code and dissect this peculiar piece of code. We’ll break it down, step by step, and uncover its true purpose. By the end of this journey, you’ll have a better understanding of this code and gain insights into JavaScript’s features and quirks.

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The Mysterious Code

Let’s begin our exploration by dissecting the code:

_=_=>_(_);_(_)

Breaking Down the Syntax

1. _=_=>_(_); implicitly declares a global variable named _ and assigns to it the result of the expression to the right. This would throw an error in strict mode, unless the variable was already declared elsewhere.
2. _=>... is an arrow function, also known as a lambda expression, that accepts a parameter named `_ (which will shadow the name of the global variable) and returns the result of the expression to the right.
3. _(_) calls the parameter _ as though it’s a function, passing in _ as the first argument to that function. This works because JavaScript features first-class functions, so they can be used as arguments to other functions or be returned from functions (this is not true in all languages).

So, _=_=>_(_); creates a higher-order function that accepts a function as a parameter and calls that second function with itself as an argument, then assigns it to a global variable named _.

The Result

The final _(_) will call the global variable _ with the same global variable, _, as an argument. The result would be a pretty quick stack overflow, since this is effectively a recursive function without any escape condition. However, modern browsers will most likely gracefully break out of the infinite recursion by throwing an error rather than simply crashing.

Here’s how you could test and catch the error:

try {
    _=_=>_(_);_(_)
} catch (error) {
    console.log(error.toString());
}

In Conclusion

JavaScript is a powerful language with a wealth of features and nuances. Code like the one you’ve shared might seem baffling, but it’s a testament to the flexibility and expressiveness of the language. It’s important to remember that even experienced developers encounter puzzling code from time to time. This snippet is a great example of how JavaScript’s features can be used in creative and unexpected ways.

While this particular piece of code may not have a practical application, it’s a fun exploration of JavaScript’s capabilities. Learning to decipher and understand such code snippets can help you become a more proficient JavaScript developer.

We hope this article has shed some light on the smiley code you encountered. Keep exploring and experimenting with JavaScript, and you’ll continue to unravel its mysteries. Happy coding!