CODEWITHSUNDEEP
julia
egesabanci
egesabanci

Reputation: 3

What is Abstract and Composite Types and how can I use them efficiently? (Julia Language)

Julia programming language has a very strong structure and usage for datatypes. I have read the original documentation of Julia but I didn't understand the 'defining a datatype' part. How can I use the datatype which is defined by me? For example

abstract type newType
end

datatype(a::newType) = return a

datatype(12)

results in 

ERROR: MethodError: no method matching datatype(::Int64)
Closest candidates are:
  datatype(::newType) at REPL[5]:1```

Upvotes: 0

Views: 106

Answers (1)

Oscar Smith
Oscar Smith

Reputation: 6378

You're basic problem is that you can not instantiate an abstract type in Julia, only a concrete subtype. For example, you can not make a Number, but instead can make an Int or a Float (which are types of Numbers).

Upvotes: 1

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