issubtype(type1, type2)
issubtype(type1, type2)
Return true if and only if all values of type1 are also of type2. Can also be written using the <: infix operator as type1 <: type2.
Examples
julia> issubtype(Float64, Real)
truejulia> issubtype(Int, Number)
truejulia> issubtype(String, AbstractString)
truejulia> issubtype(Number, Int)
falsejulia> issubtype(AbstractString, String)
falsejulia> issubtype(Any, Int)
truejulia> issubtype(Int, Any)
falseCommon mistake example:
julia> issubtype(Float64, Int)
falseIn this example, Float64 is not a subtype of Int. It's important to understand that subtyping is not based on numerical compatibility, but rather on the type hierarchy.
See Also
BigFloat, BigInt, Dict, eltype, fieldtype, Float32, Float64, IntSet, isa, isalnum, isalpha, isascii, iseltype, isequal, isgraph, isimmutable, isinteractive, isleaftype, isnull, ispunct, isspace, issubtype, keytype, Nullable, NullException, promote_type, typeintersect, typejoin, typemax, typemin, typeof, Val, valtype,User Contributed Notes
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