sumByDouble

inline fun ByteBuffer.sumByDouble(selector: (Byte) -> Double): Double
inline fun ShortBuffer.sumByDouble(selector: (Short) -> Double): Double
inline fun IntBuffer.sumByDouble(selector: (Int) -> Double): Double
inline fun LongBuffer.sumByDouble(selector: (Long) -> Double): Double
inline fun FloatBuffer.sumByDouble(selector: (Float) -> Double): Double
inline fun DoubleBuffer.sumByDouble(selector: (Double) -> Double): Double
inline fun CharBuffer.sumByDouble(selector: (Char) -> Double): Double

Returns the sum of all values produced by selector function applied to each element in the array.