Extensions for java.io.Writer

Platform and version requirements: JVM (1.0)

buffered

Returns a buffered writer wrapping this Writer, or this Writer itself if it is already buffered.

fun Writer.buffered(
    bufferSize: Int = DEFAULT_BUFFER_SIZE
): BufferedWriter

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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.io/java.io.-writer/index.html