This is my question as well. I think about types even when I don't explicitly declare them.
"Function x will return a list of a"
"Function y will return an instance of b or null"
"Function z will return an instance of c or throw an error"
How much time am I losing by putting that information in the function declaration? I doubt it's more than the time I lose when a function returns or throws something it wasn't supposed to.
"Function x will return a list of a"
"Function y will return an instance of b or null"
"Function z will return an instance of c or throw an error"
How much time am I losing by putting that information in the function declaration? I doubt it's more than the time I lose when a function returns or throws something it wasn't supposed to.