class String::Builder

Moves the write pointer, and the resulting string bytesize, by the given amount.

Chomps the last byte from the string buffer. If the byte is '\n' and there's a '\r' before it, it is also removed.

Reads at most slice.size bytes from this IO into slice. Returns the number of bytes read, which is 0 if and only if there is no more data to read (so checking for 0 is the way to detect end of file).

io = IO::Memory.new "hello"
slice = Bytes.new(4)
io.read(slice) # => 4
slice          # => Bytes[104, 101, 108, 108]
io.read(slice) # => 1
slice          # => Bytes[111, 101, 108, 108]
io.read(slice) # => 0

Sets the encoding of this IO.

The invalid argument can be:

• nil: an exception is raised on invalid byte sequences
• :skip: invalid byte sequences are ignored

String operations (gets, gets_to_end, read_char, <<, print, puts printf) will use this encoding.

Returns a string representation of this object.

Descendants must usually not override this method. Instead, they must override to_s(io), which must append to the given IO object.

Writes the contents of slice into this IO.

io = IO::Memory.new
slice = Bytes.new(4) { |i| ('a'.ord + i).to_u8 }
io.write(slice)
io.to_s # => "abcd"

Writes a single byte into this IO.

io = IO::Memory.new
io.write_byte 97_u8
io.to_s # => "a"

Writes the contents of slice, interpreted as a sequence of UTF-8 or ASCII characters, into this IO. The contents are transcoded into this IO's current encoding.

bytes = "你".to_slice # => Bytes[228, 189, 160]

io = IO::Memory.new
io.set_encoding("GB2312")
io.write_string(bytes)
io.to_slice # => Bytes[196, 227]

"你".encode("GB2312") # => Bytes[196, 227]