Any vs Unknown In TypeScript

you may think that the any type and the unknown type in typescript are the same thing or at least similar but in reality they're actually complete opposites of each other I have two variables here a which is of type any B which is type unknown and if I come in here and I just try to call something on a and I just try to call something on B it doesn't matter what it is you're going to notice a doesn't give me any errors and that's because it's type any which means it could literally be anything so they allow you to do anything at all that you want and no one on the other hand means that b we don't know what it is so we don't allow you to do anything at all if we hover over B you said B is of type unknown that's why we're getting an error because you can't call anything on it without checking what it is first so the real way to remember the difference between the two is any lets you do anything that you want while unknown restricts you from doing anything at all this is why when I have the choice I generally like to use unknown instead of any because any just essentially removes all type checking entirely while unknown forces you to be incredibly strict with your typing

Channel: Web Dev Simplified

Views: 92,833

Keywords: webdevsimplified

Id: 5SjoMNVwd4s

Length: 0min 58sec (58 seconds)

Published: Thu Apr 27 2023