diff --git a/example/demo.lua b/example/demo.lua
index c0e76b2..0ea5038 100644
--- a/example/demo.lua
+++ b/example/demo.lua
@@ -13,12 +13,8 @@ end
 
 local function makeMainComponent()
   local lnf = juce.LookAndFeel_V4.new()
-  function lnf:drawButtonBackground(g, btn, color, highlighted, down)
-    local b = btn:getBounds()
-    local bf = juce.Rectangle_int.new(b:getX(), b:getY(), b:getWidth(),
-                                      b:getHeight())
-    local c = highlighted and juce.Colours.red or juce.Colours.blue
-    g:setColour(c)
+  function lnf:drawButtonBackground(g, btn, colour, highlighted, down)
+    g:setColour(highlighted and colour or juce.Colours.blue)
     g:fillAll()
   end
 
diff --git a/example/jml/equalizer.lua b/example/jml/equalizer.lua
index 40f89e1..108b587 100644
--- a/example/jml/equalizer.lua
+++ b/example/jml/equalizer.lua
@@ -1,4 +1,4 @@
-jml = require("jml")
+local jml = require("jml")
 
 local eq = {}
 
diff --git a/example/jml/jml.lua b/example/jml/jml.lua
index 4ebc080..93756f0 100644
--- a/example/jml/jml.lua
+++ b/example/jml/jml.lua
@@ -15,23 +15,12 @@ end
 local function getTableSize(t)
   assert(isTable(t))
   local count = 0
-  for k in pairs(t) do
+  for _ in pairs(t) do
     count = count + 1
   end
   return count
 end
 
-local function max(lhs, rhs)
-  assert(isNumber(lhs))
-  assert(isNumber(rhs))
-
-  if lhs > rhs then
-    return lhs
-  end
-
-  return rhs
-end
-
 local function setEmptyProperties(spec, properties)
   assert(isTable(spec))
   assert(isTable(properties))
@@ -45,7 +34,7 @@ local function setEmptyProperties(spec, properties)
     {"margin", 0},
   }
 
-  local addProperty = function(k, v)
+  local addProperty = function(_, v)
     local id = v[1]
     local value = v[2]
     if spec[id] == nil then
@@ -64,19 +53,19 @@ local function setEmptyProperties(spec, properties)
   return spec
 end
 
-function isPercentageString(str)
+local function isPercentageString(str)
   if type(str) == "string" then
     return str:sub(-1) == "%"
   end
   return false
 end
 
-function parsePercentageToFraction(str)
+local function parsePercentageToFraction(str)
   assert(isString(str))
   return tonumber(str:sub(1, -2)) / 100.0
 end
 
-function calculatePercentageBasedSize(parentSize, children, property)
+local function calculatePercentageBasedSize(parentSize, children, property)
   assert(isNumber(parentSize))
   assert(isTable(children))
   assert(isString(property))
@@ -156,7 +145,7 @@ function jml.Component(spec)
     component:setComponentID(juce.String.new(spec.id))
 
     -- CHILDREN
-    for k, child in ipairs(spec.children) do
+    for _, child in ipairs(spec.children) do
       child.component = child.build()
       component:addAndMakeVisible(child.component)
     end
diff --git a/example/jml/main.lua b/example/jml/main.lua
index 804f5ae..9b47ba4 100644
--- a/example/jml/main.lua
+++ b/example/jml/main.lua
@@ -1,4 +1,4 @@
-jml = require("jml")
+local jml = require("jml")
 
 local ui = jml.Component{
   id = "Main Window",