This One Line Confuses 99% of JavaScript Developers! 😵‍💫 #javascript

This one-liner in JavaScript confuses most developers!

We define an arrow function and assign values like:
let a = b = 3

It looks like both a and b are block-scoped, but here’s the catch:
JavaScript treats this as:
let a = (b = 3)

That makes b a global variable!

So when we log b outside the function, it still prints 3 — no error.

Always declare all variables using let, const, or var to avoid bugs like this.

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Видео This One Line Confuses 99% of JavaScript Developers! 😵‍💫 #javascript канала Sathelli Srikanth