Here is a straightforward functional programming example. You can just drop it into your script and it will work because the functions are pure.
This is merely a crude illustration. As you mentioned, you desire a search function, a sorting function, and a way to just display particular objects.
This is the list that will be sorted:
local list = {
["Sword"] = {
["category"] = "melee",
["damage"] = 10,
["inclusionId"] = 1 -- extra property
},
["Premium blade"] = {
["category"] = "melee",
["damage"] = 10,
["inclusionId"] = 2
},
["Bow"] = {
["category"] = "range",
["damage"] = 1,
["inclusionId"] = 1
},
["Knife"] = {
["category"] = "melee",
["damage"] = 4,
["inclusionId"] = 1
}
}
We will print our sorted list first.
-- Heres a list we want to sort and filter
local list = {
["Sword"] = {
["category"] = "melee",
["damage"] = 10,
["inclusionId"] = 1 -- extra property
},
["Premium blade"] = {
["category"] = "melee",
["damage"] = 10,
["inclusionId"] = 2
},
["Bow"] = {
["category"] = "range",
["damage"] = 1,
["inclusionId"] = 1
},
["Knife"] = {
["category"] = "melee",
["damage"] = 4,
["inclusionId"] = 1
}
}
-- We want to filter the list, lets add a extra property called "inclusionId"
-- This filter is going to check if this inclusionId id matches
-- If you want to add a new list of items then create a new unique id
function Include<T>(items: {T}, permission: (value: T) -> boolean): {}
local includedList = {}
for i, item in pairs(items) do
if permission(item) then
includedList[i] = item
end
continue
end
return includedList
end
-- We want to sort our list
function Sort<T>(items: {T}, selecting: (value: T) -> string): {}
local sortedList = {}
for i, item in items do
local result = selecting(item)
if not sortedList[result] then
sortedList[result] = {}
end
sortedList[result][i] = item
continue
end
return sortedList
end
function Filter<T>(items: {T}, filter: (value: T) -> string)
local filteredList = {}
for i, item in items do
if filter(i) then
filteredList[i] = item
end
end
return filteredList
end
-- Now we want to use our pure functions
-- We test if the id's match
local included = Include(list, function(item)
return item.inclusionId == 1
end)
-- Now we filter the list with a search query
-- If none is given then it will return the full list
-- Remember its not case sensetive
local foo = "" -- This is your data from an input
local filtered = Filter(included, function(item)
return item:lower():match(foo:lower())
end)
-- Now sort the list and done!
local sorted = Sort(filtered, function(item)
return item.category
end)
-- Do something
print(sorted)
Here’s the outcome.
We’ll introduce a premium user interface next. It’s… stunning. Just kidding, I believe I rushed it.
Anyway, here is the local script’s content and structure.
local list = {
["Sword"] = {
["category"] = "melee",
["damage"] = 10,
["price"] = 100,
["inclusionId"] = 1
},
["Premium blade"] = {
["category"] = "melee",
["damage"] = 10,
["price"] = 1000,
["inclusionId"] = 2
},
["Bow"] = {
["category"] = "range",
["damage"] = 1,
["price"] = 100,
["inclusionId"] = 1
},
["Knife"] = {
["category"] = "melee",
["damage"] = 4,
["price"] = 10,
["inclusionId"] = 1
}
}
function Include<T>(items: {T}, permission: (value: T) -> boolean): {}
local includedList = {}
for i, item in pairs(items) do
if permission(item) then
includedList[i] = item
end
continue
end
return includedList
end
function Sort<T>(items: {T}, selecting: (value: T) -> string): {}
local sortedList = {}
for i, item in items do
local result = selecting(item)
if not sortedList[result] then
sortedList[result] = {}
end
sortedList[result][i] = item
continue
end
return sortedList
end
function Filter<T>(items: {T}, filter: (value: T) -> string)
local filteredList = {}
for i, item in items do
if filter(i) then
filteredList[i] = item
end
end
return filteredList
end
-- Heres the new stuff
local QueryBox = script.Parent.TextBox
local Content = script.Parent.Frame
local Preset = game:GetService("ReplicatedStorage").Preset
function Update()
local included = Include(list, function(item)
return item.inclusionId == 1
end)
local filtered = Filter(included, function(item)
return item:lower():match(QueryBox.Text:lower())
end)
local sorted = Sort(filtered, function(item)
return item.category
end)
for i, v in pairs(Content:GetChildren()) do
if v:IsA("Frame") then
v:Destroy()
end
end
for i, category in sorted do
for j, item in category do
local Copy = Preset:Clone()
Copy.Title.Text = j
Copy.Type.Text = i
Copy.Price.Text = item.price
Copy.Parent = Content
end
end
end
Update() -- We need one update before we start
QueryBox:GetPropertyChangedSignal("Text"):Connect(Update)
There you have it. You can handle things from here, I’m sure. You can ask me questions if you have any.
