Conversion koans

koans/ConversionKoans.jl

@@ -1,2 +1,35 @@
 module ConversionKoans
-end
+
+#=
+    Conversion allows to apply methods defined for the converted type.
+    Here is the basic documentation for conversion and promotion in Julia:
+        -https://docs.julialang.org/en/v1/manual/conversion-and-promotion/
+=#
+
+struct MyTypeComplex
+           real::Float64
+           imaginary::Float64
+       end
+
+struct YourType
+       end
+
+function type_of(x)
+end
+
+function int_to_float64(int)
+end
+
+function define_YourType(int, float)
+    #=
+    define a type YourType above, it receives an Int64 and a Float64
+    =#
+end
+
+function convertion_vector_to_MyTypeComplex(vec)
+    #=
+    define the conversion, from vec[::Float64, ::Float64] to MyType defined above and use the function convert
+    =#
+end
+
+end

solutions/ConversionKoans.jl

@@ -0,0 +1,42 @@
+module ConversionKoans
+
+#=
+Links:
+    - https://docs.julialang.org/en/v1/manual/conversion-and-promotion/
+=#
+
+struct MyTypeComplex
+            real::Float64
+            imaginary::Float64
+       end
+
+struct YourType
+            a::Int64
+            b::Float64
+       end
+
+function type_of(x)
+    return typeof(x)
+end
+
+function int_to_float64(int)
+    return convert(Float64, int)
+end
+
+function define_YourType(int, float)
+    #=
+    define a type YouType above, it receive an Int64 and a Float64
+    =#
+    return YourType(int, float)
+end
+
+function convertion_vector_to_MyTypeComplex(vec)
+    #=
+    define the conversion, from vec[::Float64, ::Float64] to MyType defined above to use the function convert
+    =#
+
+    convert(::Type{MyTypeComplex}, x) = MyTypeComplex(x[1],x[2])
+    return convert(MyTypeComplex, vec)
+end
+
+end

tests/solutions/tests_solutions.jl

@@ -48,9 +48,18 @@ end
 # @testset "Strings" begin
 # end
 
-# using ConversionKoans
-# @testset "Type Conversions" begin
-# end
+using ConversionKoans
+@testset "Conversion operations" begin
+    @test ConversionKoans.type_of(4) == Int64
+    @test ConversionKoans.type_of([3, 4]) == Array{Int64,1}
+    @test ConversionKoans.type_of(3.5 + im) == Complex{Float64}
+    @test ConversionKoans.int_to_float64(3) == 3.0
+    @test ConversionKoans.int_to_float64(20) == 20.0
+    @test typeof(ConversionKoans.convertion_vector_to_MyTypeComplex([5,6])) == ConversionKoans.MyTypeComplex
+    @test typeof(ConversionKoans.convertion_vector_to_MyTypeComplex([-10.1,5.4])) == ConversionKoans.MyTypeComplex
+    @test typeof(ConversionKoans.define_YourType(1, 2.2)) == ConversionKoans.YourType
+    @test typeof(ConversionKoans.define_YourType(1, -3.0)) == ConversionKoans.YourType
+end
 
 # using ArrayKoans
 # @testset "Arrays" begin

tests/tests.jl

@@ -49,7 +49,16 @@ using StringKoans
 end
 
 using ConversionKoans
-@testset "Type Conversions" begin
+@testset "Conversion operations" begin
+    @test ConversionKoans.type_of(4) == Int64
+    @test ConversionKoans.type_of([3, 4]) == Array{Int64,1}
+    @test ConversionKoans.type_of(3.5 + im) == Complex{Float64}
+    @test ConversionKoans.int_to_float64(3) == 3.0
+    @test ConversionKoans.int_to_float64(20) == 20.0
+    @test typeof(ConversionKoans.convertion_vector_to_MyTypeComplex([5,6])) == ConversionKoans.MyTypeComplex
+    @test typeof(ConversionKoans.convertion_vector_to_MyTypeComplex([-10.1,5.4])) == ConversionKoans.MyTypeComplex
+    @test typeof(ConversionKoans.define_YourType(1, 2.2)) == ConversionKoans.YourType
+    @test typeof(ConversionKoans.define_YourType(1, -3.0)) == ConversionKoans.YourType
 end
 
 using ArrayKoans