Hello, http://mail.openjdk.java.net/pipermail/nashorn-dev/2014-October/003711.html Why did Nashorn not implement the ArrayBuffer.isView() static method? The page at https://wiki.openjdk.java.net/display/Nashorn/Nashorn+extensions describes that Nashorn implements the specification at https://www.khronos.org/registry/typedarray/specs/latest/ that conatins this method. However, this method is missing. The following statement throws an exception: ArrayBuffer.isView(new Int8Array(4)); Thanks Kishori