bitwise bools

in the wild

StringIO Modes

require "stringio"

io = StringIO.new("hello".freeze)
io << "world"

require "stringio"

io = StringIO.new("hello".freeze)
io << "world"
# 💣 IOError: not opened for writing

require "stringio"

io = StringIO.new("hello".freeze)
io << "world"
# 💣 IOError: not opened for writing

io2 = StringIO.new("hello".freeze, "w+")

require "stringio"

io = StringIO.new("hello".freeze)
io << "world"
# 💣 IOError: not opened for writing

io2 = StringIO.new("hello".freeze, "w+")
# 💣 Errno::EACCES: Permission denied

require "stringio"

io = StringIO.new("hello".freeze)
io << "world"
# 💣 IOError: not opened for writing

io2 = StringIO.new("hello".freeze, "w+")
# 💣 Errno::EACCES: Permission denied

io3 = StringIO.new("hello".freeze, File::RDWR)

require "stringio"

io = StringIO.new("hello".freeze)
io << "world"
# 💣 IOError: not opened for writing

io2 = StringIO.new("hello".freeze, "w+")
# 💣 Errno::EACCES: Permission denied

io3 = StringIO.new("hello".freeze, File::RDWR)
# 💣 Errno::EACCES: Permission denied

Open Modes

File.open("my-file.txt", "r")