int getUint64(
int byteOffset,
[Endianness endian = Endianness.BIG_ENDIAN]
)

Returns the positive integer represented by the eight bytes starting at the specified byteOffset in this object, in unsigned binary form.

The return value will be between 0 and 2<sup>64</sup> - 1, inclusive.

Throws RangeError if byteOffset is negative, or byteOffset + 8 is greater than the length of this object.

Source

/**
 * Returns the positive integer represented by the eight bytes starting
 * at the specified [byteOffset] in this object, in unsigned binary
 * form.
 *
 * The return value will be between 0 and  2<sup>64</sup> - 1, inclusive.
 *
 * Throws [RangeError] if [byteOffset] is negative, or
 * `byteOffset + 8` is greater than the length of this object.
 */
int getUint64(int byteOffset, [Endianness endian = Endianness.BIG_ENDIAN]);