Almost working from 1st try

tablefuncs.lua

@@ -0,0 +1,27 @@
+-- Find key by value in table by predicate
+---@param table table
+---@param value any
+---@param pred function
+---@return any
+function TableFind( table, value, pred )
+    for key, innervalue in pairs( table ) do
+        if pred( value, innervalue ) then
+            return key
+        end
+    end
+    return nil
+end
+
+-- Find if value exists in table by predicate
+---@param table table
+---@param value any
+---@param pred function
+---@return boolean
+function TableHas( table, value, pred )
+    for _, innervalue in pairs( table ) do
+        if pred( value, innervalue ) then
+            return true
+        end
+    end
+    return false
+end