unsafe.Slice

Package unsafe … The function Slice returns a slice whose underlying array starts at ptr and whose length and capacity are len. Slice(ptr, len) is equivalent to (*[len]ArbitraryType)(unsafe.Pointer(ptr))[:] except that, as a special case, if ptr is nil and len is zero, Slice returns nil [Go 1.17]. The len argument must be of integer type or an untyped constant. A constant len argument must be non-negative and representable by a value of type int; if it is an untyped constant it is given type int.