Convert String to ArrayBuffer

str2ab.js

export function str2ab(str)
{
  let buf = new ArrayBuffer(str.length * 2) // 2 bytes for each char
  let bufView = new Uint16Array(buf)

  for (let i = 0, strLen = str.length; i < strLen; i++) {
    bufView[i] = str.charCodeAt(i)
  }

  return buf
}