# getFloat64 method

double getFloat64 (int byteOffset, [ Endian endian = Endian.big ])

Returns the floating point number represented by the eight bytes at the specified `byteOffset` in this object, in IEEE 754 double-precision binary floating-point format (binary64).

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

## Implementation

    double getFloat64(int byteOffset, [Endian endian = Endian.big]);