Skip to content
halo`s Docs

The `io` package in Go

The io package in Go

  1. io.Read()
    Reads data from a source (like a file or network connection) into a byte slice.

    n, err := io.Read(p []byte)

  2. io.ReadAtLeast()
    Reads at least the specified number of bytes from a source.

    n, err := io.ReadAtLeast(r io.Reader, p []byte, min int)

  3. io.ReadFull()
    Reads exactly the number of bytes specified by the length of the provided byte slice.

    n, err := io.ReadFull(r io.Reader, p []byte)

  4. io.Write()
    Writes data from a byte slice to a destination.

    n, err := io.Write(p []byte)

  5. io.Copy()
    Copies data from a source (reader) to a destination (writer) until EOF.

    n, err := io.Copy(dst io.Writer, src io.Reader)

  6. io.CopyN()
    Copies exactly n bytes from the reader to the writer.

    n, err := io.CopyN(dst io.Writer, src io.Reader, n int64)

  7. io.TeeReader()
    Creates a reader that reads from the underlying reader and writes to the writer.

    tee := io.TeeReader(r io.Reader, w io.Writer)

  8. io.MultiReader()
    Combines multiple readers into a single reader that reads from each of them sequentially.

    r := io.MultiReader(r1, r2)

  9. io.MultiWriter()
    Combines multiple writers into a single writer that writes to all of them.

    w := io.MultiWriter(w1, w2)

  10. io.Discard
    A Writer that discards all data written to it. Useful for ignoring output.

io.Discard.Write(p []byte)

These functions are widely used for handling input/output operations efficiently in Go, especially when working with streams, files, or network connections.