Types

In [41]:

    

(1+2)::AbstractFloat


    

    




TypeError: typeassert: expected AbstractFloat, got Int64

In [42]:

    

(1+2)::Int


    

    
Out[42]:





3

In [43]:

    

function foo() x::Int8 = 100
x
end


    

    
Out[43]:





foo (generic function with 1 method)

In [49]:

    

x = foo()
100
typeof(x)
Int8


    

    
Out[49]:





Int8

In [34]:

    

workspace()
type Employee
           firstName::String
           lastName::String
           id::Int64
end


    

In [35]:

    

emp1=Employee("John", "Frusciante", 1)
println(emp1.firstName)
println(emp1.lastName)
println(emp1.id)


    

    




John
Frusciante
1

In [36]:

    

# User defined types can be changed

emp1.firstName="Frederick"
emp1.lastName="Chopin"
emp1


    

    
Out[36]:





Employee("Frederick","Chopin",1)

In [37]:

    

# Julia pass the objects to function by reference, so any changes you made to the object inside a function are visible 
#outside also
function changeEmployee(emp::Employee,firstName,lastName,id)
           emp.firstName=firstName
           emp.lastName=lastName
           emp.id=id
end

changeEmployee(emp1,"Django","Reinhardt",1234)
emp1


    

    
Out[37]:





Employee("Django","Reinhardt",1234)

In [38]:

    

#You can create immutable type using the keyword immutable


    

In [39]:

    

immutable Student
           id::Int64
           name::String
end

stud1=Student(1, "Bill")


    

    
Out[39]:





Student(1,"Bill")

In [40]:

    

stud1.id=5


    

    




type Student is immutable

In [ ]: