diff --git a/gui/core.lua b/gui/core.lua
index 316d45a..a7bd8c4 100644
--- a/gui/core.lua
+++ b/gui/core.lua
@@ -51,13 +51,13 @@ function LOAD()
 				text:SetFont(font, 14)
 				text:SetPoint('TOPLEFT', 18, 0)
 				text:SetPoint('BOTTOMRIGHT', -8, 0)
-				local highlight = _G['DropDownList1Button' .. i..'Highlight']
+				local highlight = _G['DropDownList1Button' .. i .. 'Highlight']
 				highlight:ClearAllPoints()
 				highlight:SetDrawLayer('OVERLAY')
 				highlight:SetHeight(14)
 				highlight:SetPoint('LEFT', 5, 0)
 				highlight:SetPoint('RIGHT', -3, 0)
-				local check = _G['DropDownList1Button' .. i..'Check']
+				local check = _G['DropDownList1Button' .. i .. 'Check']
 				check:SetWidth(16)
 				check:SetHeight(16)
 				check:SetPoint('LEFT', 3, -1)
@@ -73,10 +73,10 @@ function LOAD()
 				local text = button:GetFontString()
 				text:SetFont([[Fonts\FRIZQT__.ttf]], 10)
 				text:SetShadowOffset(1, -1)
-				local highlight = _G['DropDownList1Button' .. i..'Highlight']
+				local highlight = _G['DropDownList1Button' .. i .. 'Highlight']
 				highlight:SetAllPoints()
 				highlight:SetDrawLayer'BACKGROUND'
-				local check = _G['DropDownList1Button' .. i..'Check']
+				local check = _G['DropDownList1Button' .. i .. 'Check']
 				check:SetWidth(24)
 				check:SetHeight(24)
 				check:SetPoint('LEFT', 0, 0)
diff --git a/libs/inspect.lua b/libs/inspect.lua
index d41f441..5c371ac 100644
--- a/libs/inspect.lua
+++ b/libs/inspect.lua
@@ -5,11 +5,11 @@ function print(msg)
 end
 
 function format_key(k)
-	return type(k) == 'string' and k or '['..tostring(k)..']'
+	return type(k) == 'string' and k or '[' .. tostring(k) .. ']'
 end
 
 function format_value(v)
-	return type(v) == 'string' and '"'..v..'"' or tostring(v)
+	return type(v) == 'string' and '"' .. v .. '"' or tostring(v)
 end
 
 function print_table(t, depth)
@@ -27,12 +27,12 @@ local max_depth
 
 function print_pair(k, v, depth)
 	local padding = strrep(' ', depth * 4)
-	print(padding..format_key(k)..' = '..format_value(v))
+	print(padding .. format_key(k) .. ' = ' .. format_value(v))
 	if type(v) == 'table' then
 		if next(v) then
-			print(padding..'{')
+			print(padding .. '{')
 			if depth == max_depth then
-				print(padding..'    ...')
+				print(padding .. '    ...')
 			else
 				print_table(v, depth + 1)
 			end
@@ -55,9 +55,9 @@ local function setting(v)
 	if type(v) == 'number' then
 		max_depth = v
 	elseif type(v) == 'function' then
-		print('#'..v())
+		print('#' .. v())
 	else
-		print('#'..v)
+		print('#' .. v)
 	end
 end
 
diff --git a/tabs/search/filter.lua b/tabs/search/filter.lua
index 4923113..d13b4f3 100644
--- a/tabs/search/filter.lua
+++ b/tabs/search/filter.lua
@@ -399,6 +399,6 @@ function initialize_quality_dropdown()
 	end
 	UIDropDownMenu_AddButton(T('text', ALL, 'value', -1, 'func', on_click))
 	for i = 0, 4 do
-		UIDropDownMenu_AddButton(T('text', _G['ITEM_QUALITY' .. i..'_DESC'], 'value', i, 'func', on_click))
+		UIDropDownMenu_AddButton(T('text', _G['ITEM_QUALITY' .. i .. '_DESC'], 'value', i, 'func', on_click))
 	end
 end
diff --git a/util/filter.lua b/util/filter.lua
index 9868681..6ec627b 100644
--- a/util/filter.lua
+++ b/util/filter.lua
@@ -213,7 +213,7 @@ public.filters = {
 function operator(str)
     local operator = str == 'not' and A('operator', 'not', 1)
     for name in temp-S('and', 'or') do
-	    for arity in present(select(3, strfind(str, '^'..name..'(%d*)$'))) do
+	    for arity in present(select(3, strfind(str, '^' .. name .. '(%d*)$'))) do
 		    arity = tonumber(arity)
 		    operator = not (arity and arity < 2) and A('operator', name, arity)
 	    end
@@ -302,9 +302,9 @@ function public.parse_filter_string(str)
                     if parts[i] == 'item' then
                         return nil, 'Invalid item name', aux_auctionable_items
                     elseif type(input_type) == 'table' then
-                        return nil, 'Invalid choice for '..parts[i], input_type
+                        return nil, 'Invalid choice for ' .. parts[i], input_type
                     else
-                        return nil, 'Invalid input for '..parts[i]..'. Expecting: '..input_type
+                        return nil, 'Invalid input for ' .. parts[i] .. '. Expecting: ' .. input_type
                     end
                 end
                 tinsert(post_filter, A('filter', parts[i], parts[i + 1]))
@@ -413,13 +413,13 @@ function suggestions(filter)
 
     -- rarities
     if not filter.blizzard.quality then
-        for i = 0, 4 do tinsert(suggestions, _G['ITEM_QUALITY'..i..'_DESC']) end
+        for i = 0, 4 do tinsert(suggestions, _G['ITEM_QUALITY' .. i .. '_DESC']) end
     end
 
     -- item names
     if getn(filter.components) == 0 then
         for _, name in aux_auctionable_items do
-            tinsert(suggestions, name..'/exact')
+            tinsert(suggestions, name .. '/exact')
         end
     end
 
@@ -433,7 +433,7 @@ function public.filter_string(components)
 	    if component[1] == 'blizzard' then
 		    query_builder.append(filter[4] or filter[3])
         elseif component[1] == 'operator' then
-            query_builder.append(component[2]..(component[2] ~= 'not' and tonumber(component[3]) or ''))
+            query_builder.append(component[2] .. (component[2] ~= 'not' and tonumber(component[3]) or ''))
         elseif component[1] == 'filter' then
             query_builder.append(component[2])
             for parameter in present(component[3]) do
@@ -455,7 +455,7 @@ function prettified_filter_string(filter)
 	    if component[1] == 'blizzard' then
 		    if component[2] == 'name' then
 			    if filter.blizzard.exact then
-			        prettified.append(info.display_name(cache.item_id(component[4])) or color.orange('['..component[4]..']'))
+			        prettified.append(info.display_name(cache.item_id(component[4])) or color.orange('[' .. component[4] .. ']'))
 			    elseif component[4] ~= '' then
 				    prettified.append(color.orange(component[4]))
 			    end
@@ -463,14 +463,14 @@ function prettified_filter_string(filter)
 			    prettified.append(color.orange(component[3]))
 		    end
         elseif component[1] == 'operator' then
-			prettified.append(color.orange(component[2]..(component[2] ~= 'not' and tonumber(component[3]) or '')))
+			prettified.append(color.orange(component[2] .. (component[2] ~= 'not' and tonumber(component[3]) or '')))
         elseif component[1] == 'filter' then
             if component[2] ~= 'tooltip' then
                 prettified.append(color.orange(component[2]))
             end
             for parameter in present(component[3]) do
 	            if component[2] == 'item' then
-		            prettified.append(info.display_name(cache.item_id(parameter)) or color.label.enabled('['..parameter..']'))
+		            prettified.append(info.display_name(cache.item_id(parameter)) or color.label.enabled('[' .. parameter .. ']'))
 	            else
 		            if filters[component[2]].input_type == 'money' then
 			            prettified.append(money.to_string(money.from_string(parameter), nil, true, nil, inline_color.label.enabled))
@@ -566,7 +566,7 @@ function public.query_builder()
     local filter
     return T(
 		'append', function(part)
-            filter = not filter and part or filter..'/'..part
+            filter = not filter and part or filter .. '/' .. part
         end,
 		'get', function()
             return filter or ''
diff --git a/util/info.lua b/util/info.lua
index 29c6713..59864b1 100644
--- a/util/info.lua
+++ b/util/info.lua
@@ -399,7 +399,7 @@ end
 
 function public.item_quality_index(item_quality)
     for i = 0, 4 do
-        local quality = _G['ITEM_QUALITY' .. i..'_DESC']
+        local quality = _G['ITEM_QUALITY' .. i .. '_DESC']
         if strupper(item_quality) == strupper(quality) then
             return i, quality
         end