Keys

Teisu.keys is a state object that processes keys from another table.

Usage

To create a keys object, call Teisu.keys and pass in an input molecule and a transformer function.

local keys = Teisu.keys

local data = flec({ foo = "bar", bar = "bazz" })

local uppercase = keys(data, function(key)
    return string.upper(key)
end)

You can access uppercase's contents like a computed:

print(uppercase()) --> { FOO = "bar", BAR = "bazz" }
print(peek(uppercase))

Whenever your input molecule changes, the output will update.

data(function(old)
    local new = table.clone(old)
    new.foo = nil

    return new
end)

print(uppercase()) --> { BAR = "bazz" }

If Teisu.cleanup is called, any object passed in as an argument will get cleaned up when a processed key is removed.

Luau code

local uppercase = keys(data, function(key)
    cleanup(function()
        print("removed a key!")
    end)

    return string.upper(key)
end)

data(function(old)
    local new = table.clone(old)
    new.foo = nil

    return new
end)
print(uppercase())

Output

removed a key!
{ BAR = "bazz" }