check if the input is a directory path or not

[jchd]

Ah, you mean you want to differenciate whether the user wants to create a folder or a file with the input (s)he supplies you? In short: read his/her mind?

That's the same difference between buying raw goods and cooking a meal, or for a doctor to prescribe some rest or brain surgery.

Leave the user the clear choice:

A/ I want to create a folder     (cooking, surgery)
B/ I want a new file                   (goods, rest)

That leaves open the creation of files without extension (something perfectly legitimate) and folder having one or more dots (also completely valid).

[mikell]

57 minutes ago, ericire said:

how to distinguish a file path from a folder path before creating it

If you get it from an input, maybe you can force a trailing backslash.  "something.csv\"  is a folder