Julia implementation of the Gilded Rose kata

julia/.gitignore

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+*.jl.*.cov
+*.jl.cov
+*.jl.mem
+/Manifest.toml
+/docs/build/

julia/gilded_rose.jl

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+import Base
+
+mutable struct Item{T<:Real}
+    name::String
+    sellin::T
+    quality::T
+end
+
+Base.show(io::IO, x::Item) = print(io, "$(x.name), $(x.sellin), $(x.quality)")
+
+struct GildedRose
+    items
+end
+
+function update_quality!(gr::GildedRose)
+    for item in gr.items
+        if item.name != "Aged Brie" && item.name != "Backstage passes to a TAFKAL80ETC concert"
+            if item.quality > 0
+                if item.name != "Sulfuras, Hand of Ragnaros"
+                    item.quality = item.quality - 1
+                end
+            end
+        else
+            if item.quality < 50
+                item.quality = item.quality + 1
+                if item.name == "Backstage passes to a TAFKAL80ETC concert"
+                    if item.sellin < 11
+                        if item.quality < 50
+                            item.quality = item.quality + 1
+                        end
+                    end
+                    if item.sellin < 6
+                        if item.quality < 50
+                            item.quality = item.quality + 1
+                        end
+                    end
+                end
+            end
+        end
+        if item.name != "Sulfuras, Hand of Ragnaros"
+            item.sellin = item.sellin - 1
+        end
+        if item.sellin < 0
+            if item.name != "Aged Brie"
+                if item.name != "Backstage passes to a TAFKAL80ETC concert"
+                    if item.quality > 0
+                        if item.name != "Sulfuras, Hand of Ragnaros"
+                            item.quality = item.quality - 1
+                        end
+                    end
+                else
+                    item.quality = item.quality - item.quality
+                end
+            else
+                if item.quality < 50
+                    item.quality = item.quality + 1
+                end
+            end
+        end
+    end
+    return nothing
+end
+
+# Technically, julia espouses a REPL-driven workflow, so the preferred way to run this
+# would be from the REPL. However, if you'd like to run this function from the
+# commandline, run `$ julia -e 'include("gilded_rose.jl"); main(;days=3)'` or whatever
+# number you want for `days`.
+function main(; days::Int64=2)
+    println("OMGHAI!")
+    items = [
+        Item("+5 Dexterity Vest", 10, 20),
+        Item("Aged Brie", 2, 0),
+        Item("Elixir of the Mongoose", 5, 7),
+        Item("Sulfuras, Hand of Ragnaros", 0, 80),
+        Item("Sulfuras, Hand of Ragnaros", -1, 80),
+        Item("Backstage passes to a TAFKAL80ETC concert", 15, 20),
+        Item("Backstage passes to a TAFKAL80ETC concert", 10, 49),
+        Item("Backstage passes to a TAFKAL80ETC concert", 5, 49),
+        Item("Conjured Mana Cake", 3, 6),
+    ]
+    for day in 1:days
+        println("-------- day $day --------")
+        println("name, sellin, quality")
+        for item in items
+            println(item)
+        end
+        update_quality!(GildedRose(items))
+    end
+end

julia/runtests.jl

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+using Test
+
+# To run the tests, include this file into your REPL
+# julia> include("runtests.jl")
+
+include("gilded_rose.jl")
+
+@testset "gilded_rose.jl" begin
+
+    # Test foo
+    items = [Item("foo", 0, 0)]
+    gildedrose = GildedRose(items)
+    update_quality!(gildedrose)
+    @test items[1].name == "fixme"
+
+end