From type/IO/Socket

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method write(IO::Socket:D: Blob:D $buf)

Writes the supplied buffer to the socket, thus sending it to other end of the connection. The string version is #method print.

Fails if the socket is not connected.

From type/IO/Socket/Async

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method write(IO::Socket::Async:D: Blob $b --> Promise)

This method will attempt to send the bytes in $b on the IO::Socket::Async that will have been obtained indirectly via connect or listen, returning a Promise that will be kept with the number of bytes sent or broken if there was an error sending.

From type/Proc/Async

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method write(Proc::Async:D: Blob:D $b, :$scheduler = $*SCHEDULER --> Promise:D)

Write the binary data in $b to the standard input stream of the external program.

Returns a Promise that will be kept once the data has fully landed in the input buffer of the external program.

The Proc::Async object must be created for writing (with Proc::Async.new(:w, $path, @args)). Otherwise an X::Proc::Async::OpenForWriting exception will the thrown.

start must have been called before calling method write, otherwise an X::Proc::Async::MustBeStarted exception is thrown.

From type/IO/Handle

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method write(IO::Handle:D: Blob:D $buf --> True)

Writes $buf to the filehandle. This method can be called even when the handle is not :$enc.

From type/IO/CatHandle

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multi method write(|)

The IO::CatHandle type overrides this method to throw a X::NYI exception. If you have a good idea for how this method should behave, tell Rakudo developers about it!