Function byteLength

lib/buffer.js:837–868

(string, encoding)

}

function byteLength(string, encoding) {
  if (typeof string !== 'string') {
    if (isArrayBufferView(string) || isAnyArrayBuffer(string)) {
      return string.byteLength;
    }

    throw new ERR_INVALID_ARG_TYPE(
      'string', ['string', 'Buffer', 'ArrayBuffer'], string,
    );
  }

  const len = string.length;
  if (len === 0)
    return 0;

  if (!encoding || encoding === 'utf8') {
    return byteLengthUtf8(string);
  }

  if (encoding === 'ascii') {
    return len;
  }

  const ops = getEncodingOps(encoding);
  if (ops === undefined) {
    // TODO (ronag): Makes more sense to throw here.
    // throw new ERR_UNKNOWN_ENCODING(encoding);
    return byteLengthUtf8(string);
  }

  return ops.byteLength(string);
}

Buffer.byteLength = byteLength;