isDirectory -- whether a file is a directory

• Usage:

  isDirectory fn

• Inputs:
  • fn, a string, a filename or path
• Outputs:
  • a Boolean value, whether fn is the path to a directory

i1 : isDirectory "."

o1 = true

i2 : fn = temporaryFileName()

o2 = /tmp/M2-28518-0/0

i3 : fn << "hi there" << close

o3 = /tmp/M2-28518-0/0

o3 : File

i4 : isDirectory fn

o4 = false

i5 : removeFile fn