How to know if a variable of arbitrary type is Zero in Golang?

Question

Because not all types are comparable, e.g. a slice. So we can\'t do this

var v ArbitraryType
v == reflect.Zero(reflect.TypeOf(v)).Interface()

Answer 1

Both of the following give me reasonable results (probably because they're the same?)

reflect.ValueOf(v) == reflect.Zero(reflect.TypeOf(v)))

reflect.DeepEqual(reflect.ValueOf(v), reflect.Zero(reflect.TypeOf(v)))

e.g. various integer 0 flavours and uninitialized structs are "zero"

Sadly, empty strings and arrays are not. and nil gives an exception.
You could special case these if you wanted.