startsWith

fun Source.startsWith(byte: Byte): Boolean(source)

Return true if the next byte to be consumed from this source is equal to byte. Otherwise, return false as well as when the source is exhausted.

If there is no buffered data, this call will result in a fetch from the underlying source.

Throws

IllegalStateException

when the source is closed.

IOException

when some I/O error occurs.

Samples

import kotlinx.io.*
import kotlin.test.*

fun main() { 
   //sampleStart 
   val buffer = Buffer()
buffer.write(byteArrayOf(1, 2, 3, 4, 5))

assertTrue(buffer.startsWith(1))
assertFalse(buffer.startsWith(0))

buffer.clear()
assertFalse(buffer.startsWith(1)) 
   //sampleEnd
}