isType functions

Check the type of the passed parameter.

isNull(object) : bool
isBool(object) : bool
isInt(object) : bool
isFloat(object) : bool
isString(object) : bool
isStruct(object) : bool
isArray(object) : bool
isSet(object) : bool
isGraph(object) : bool
isVertex(object) : bool
isEdge(object) : bool