I looove flow typing / type narrowing. HTDP taught how to think through it (data type narrowing / checking for and handling different types) while building func

I looove flow typing / type narrowing. HTDP taught how to think through it (data type narrowing / checking for and handling different types) while building functions. TypeScript let's me enforce the same process with intellisense warning me whenever I get off track. It's been a joy to see how quickly and solidly the code stacks up.