diff --git a/src/helpers.cr b/src/helpers.cr
index 9032c2d..e7dc4cb 100644
--- a/src/helpers.cr
+++ b/src/helpers.cr
@@ -108,7 +108,7 @@ module Crysterm
     # Strips text of {...} tags and SGR sequences
     def clean_tags(text)
       combined_regex = /(?:#{Crysterm::Widget::TAG_REGEX.source})|(?:#{Crysterm::Widget::SGR_REGEX.source})/
-      text.gsub(combined_regex) do |buffer, _|
+      text.gsub(combined_regex) do |_, _|
         # No replacement needed, just removing matches
       end
     end
diff --git a/src/mixin/children.cr b/src/mixin/children.cr
index 59f9aa9..c648c42 100644
--- a/src/mixin/children.cr
+++ b/src/mixin/children.cr
@@ -130,12 +130,12 @@ module Crysterm
 
       # Emits `ev` on all children nodes, recursively.
       def emit_descendants(ev : EventHandler::Event | EventHandler::Event.class) : Nil
-        each_descendant { |el| el.emit ev }
+        each_descendant(&.emit(ev))
       end
 
       # Emits `ev` on all parent nodes.
       def emit_ancestors(ev : EventHandler::Event | EventHandler::Event.class) : Nil
-        each_ancestor { |el| el.emit ev }
+        each_ancestor(&.emit(ev))
       end
     end
   end
diff --git a/src/screen.cr b/src/screen.cr
index 8b44245..a207d09 100644
--- a/src/screen.cr
+++ b/src/screen.cr
@@ -214,7 +214,7 @@ module Crysterm
 
       # Push resize event to screens assigned to this display. We choose this approach
       # because it results in less links between the components (as opposed to pull model).
-      @_resize_handler = GlobalEvents.on(::Crysterm::Event::Resize) do |e|
+      @_resize_handler = GlobalEvents.on(::Crysterm::Event::Resize) do |_|
         schedule_resize
       end
     end
diff --git a/src/screen_angles.cr b/src/screen_angles.cr
index 9877960..a7b28a4 100644
--- a/src/screen_angles.cr
+++ b/src/screen_angles.cr
@@ -48,7 +48,7 @@ module Crysterm
       ch = lines[y][x].char
 
       if lines[y][x - 1]? && L_ANGLES.includes? lines[y][x - 1].char
-        if (lines[y][x - 1].attr != attr)
+        if lines[y][x - 1].attr != attr
           case @dock_contrast
           when DockContrast::DontDock
             return ch
@@ -62,7 +62,7 @@ module Crysterm
       end
 
       if lines[y - 1]? && U_ANGLES.includes? lines[y - 1][x].char
-        if (lines[y - 1][x].attr != attr)
+        if lines[y - 1][x].attr != attr
           case @dock_contrast
           when DockContrast::DontDock
             return ch
@@ -76,7 +76,7 @@ module Crysterm
       end
 
       if lines[y][x + 1]? && R_ANGLES.includes? lines[y][x + 1].char
-        if (lines[y][x + 1].attr != attr)
+        if lines[y][x + 1].attr != attr
           case @dock_contrast
           when DockContrast::DontDock
             return ch
@@ -90,7 +90,7 @@ module Crysterm
       end
 
       if lines[y + 1]? && D_ANGLES.includes? lines[y + 1][x].char
-        if (lines[y + 1][x].attr != attr)
+        if lines[y + 1][x].attr != attr
           case @dock_contrast
           when DockContrast::DontDock
             return ch
diff --git a/src/screen_attributes.cr b/src/screen_attributes.cr
index 57b1cd3..7d65ef1 100644
--- a/src/screen_attributes.cr
+++ b/src/screen_attributes.cr
@@ -11,7 +11,7 @@ module Crysterm
       # i
 
       code = code[2...-1].split(';')
-      if (!code[0]? || code[0].empty?)
+      if !code[0]? || code[0].empty?
         code[0] = "0"
       end
 
@@ -64,46 +64,46 @@ module Crysterm
           bg = dfl & 0x1ff
           break
         else # color
-          if (c == 48 && code[i + 1].to_i == 5)
+          if c == 48 && code[i + 1].to_i == 5
             i += 2
             bg = code[i].to_i
             break
-          elsif (c == 48 && code[i + 1].to_i == 2)
+          elsif c == 48 && code[i + 1].to_i == 2
             i += 2
             bg = Colors.match(code[i].to_i, code[i + 1].to_i, code[i + 2].to_i)
-            if (bg == -1)
+            if bg == -1
               bg = dfl & 0x1ff
             end
             i += 2
             break
-          elsif (c == 38 && code[i + 1].to_i == 5)
+          elsif c == 38 && code[i + 1].to_i == 5
             i += 2
             fg = code[i].to_i
             break
-          elsif (c == 38 && code[i + 1].to_i == 2)
+          elsif c == 38 && code[i + 1].to_i == 2
             i += 2
             fg = Colors.match(code[i].to_i, code[i + 1].to_i, code[i + 2].to_i)
-            if (fg == -1)
+            if fg == -1
               fg = (dfl >> 9) & 0x1ff
             end
             i += 2 # XXX Why ameba says this is no-op?
             break
           end
-          if (c >= 40 && c <= 47)
+          if c >= 40 && c <= 47
             bg = c - 40
-          elsif (c >= 100 && c <= 107)
+          elsif c >= 100 && c <= 107
             bg = c - 100
             bg += 8
-          elsif (c == 49)
+          elsif c == 49
             bg = dfl & 0x1ff
-          elsif (c >= 30 && c <= 37)
+          elsif c >= 30 && c <= 37
             fg = c - 30
-          elsif (c >= 90 && c <= 97)
+          elsif c >= 90 && c <= 97
             fg = c - 90
             fg += 8
-          elsif (c == 39)
+          elsif c == 39
             fg = (dfl >> 9) & 0x1ff
-          elsif (c == 100)
+          elsif c == 100
             fg = (dfl >> 9) & 0x1ff
             bg = dfl & 0x1ff
           end
@@ -138,18 +138,18 @@ module Crysterm
         # invisible
         outbuf << "8;" if (flags & 16) != 0
 
-        if (bg != 0x1ff)
+        if bg != 0x1ff
           bg = _reduce_color(bg)
-          if (bg < 16)
+          if bg < 16
             bg < 8 ? outbuf << (bg + 40) << ';' : outbuf << (bg - 8 + 100) << ';'
           else
             outbuf << "48;5;" << bg << ';'
           end
         end
 
-        if (fg != 0x1ff)
+        if fg != 0x1ff
           fg = _reduce_color(fg)
-          if (fg < 16)
+          if fg < 16
             fg < 8 ? outbuf << (fg + 30) << ';' : outbuf << (fg - 8 + 90) << ';'
           else
             outbuf << "38;5;" << fg << ';'
diff --git a/src/screen_drawing.cr b/src/screen_drawing.cr
index 4210b21..8bb725c 100644
--- a/src/screen_drawing.cr
+++ b/src/screen_drawing.cr
@@ -70,7 +70,7 @@ module Crysterm
         # ::Log.trace { line } if line.any? &.char.!=(' ')
 
         # Skip if no change in line
-        if (!line.dirty && !(c.artificial? && (y == tput.cursor.y)))
+        if !line.dirty && !(c.artificial? && (y == tput.cursor.y))
           next
         end
 
@@ -92,7 +92,7 @@ module Crysterm
           desired_char = line[x].char
 
           # Render the artificial cursor.
-          if (c.artificial? && !c._hidden && (c._state != 0) && (x == tput.cursor.x) && (y == tput.cursor.y))
+          if c.artificial? && !c._hidden && (c._state != 0) && (x == tput.cursor.x) && (y == tput.cursor.y)
             desired_attr, tmpch = _artificial_cursor_attr(c, desired_attr)
             desired_char = tmpch if tmpch
             # XXX Is this needed:
@@ -101,9 +101,9 @@ module Crysterm
           # Take advantage of xterm's back_color_erase feature by using a
           # lookahead. Stop spitting out so many damn spaces. NOTE: Is checking
           # the bg for non BCE terminals worth the overhead?
-          if (@optimization.bce? && (desired_char == ' ') &&
+          if @optimization.bce? && (desired_char == ' ') &&
              (tput.has?(&.back_color_erase?) || ((desired_attr & 0x1ff) == (@default_attr & 0x1ff))) &&
-             (((desired_attr >> 18) & 8) == ((@default_attr >> 18) & 8)))
+             (((desired_attr >> 18) & 8) == ((@default_attr >> 18) & 8))
             clr = true
             neq = false # Current line 'not equal' to line as it was on previous render (i.e. it changed content)
 
@@ -226,34 +226,34 @@ module Crysterm
 
               flags = desired_attr >> 18
               # bold
-              if ((flags & 1) != 0)
+              if (flags & 1) != 0
                 @outbuf.print "1;"
               end
 
               # underline
-              if ((flags & 2) != 0)
+              if (flags & 2) != 0
                 @outbuf.print "4;"
               end
 
               # blink
-              if ((flags & 4) != 0)
+              if (flags & 4) != 0
                 @outbuf.print "5;"
               end
 
               # inverse
-              if ((flags & 8) != 0)
+              if (flags & 8) != 0
                 @outbuf.print "7;"
               end
 
               # invisible
-              if ((flags & 16) != 0)
+              if (flags & 16) != 0
                 @outbuf.print "8;"
               end
 
-              if (bg != 0x1ff)
+              if bg != 0x1ff
                 bg = _reduce_color(bg)
-                if (bg < 16)
-                  if (bg < 8)
+                if bg < 16
+                  if bg < 8
                     bg += 40
                   else # elsif (bg < 16)
                     bg -= 8
@@ -265,10 +265,10 @@ module Crysterm
                 end
               end
 
-              if (fg != 0x1ff)
+              if fg != 0x1ff
                 fg = _reduce_color(fg)
-                if (fg < 16)
-                  if (fg < 8)
+                if fg < 16
+                  if fg < 8
                     fg += 30
                   else # elsif (fg < 16)
                     fg -= 8
@@ -339,7 +339,7 @@ module Crysterm
           # case that the contents of the IF/ELSE block change in incompatible
           # way, this should be had in mind.
           if s
-            if (s.enter_alt_charset_mode? && !tput.features.broken_acs? && (tput.features.acscr[desired_char]? || acs))
+            if s.enter_alt_charset_mode? && !tput.features.broken_acs? && (tput.features.acscr[desired_char]? || acs)
               # Fun fact: even if tput.brokenACS wasn't checked here,
               # the linux console would still work fine because the acs
               # table would fail the check of: tput.features.acscr[desired_char]
@@ -380,7 +380,7 @@ module Crysterm
             # Note: It could be the case that the $LANG
             # is all that matters in some cases:
             # if (!tput.unicode && desired_char > '~') {
-            if (!tput.features.unicode? && (tput.terminfo.try(&.extensions.get_num?("U8")) != 1) && (desired_char > '~'))
+            if !tput.features.unicode? && (tput.terminfo.try(&.extensions.get_num?("U8")) != 1) && (desired_char > '~')
               # Reduction of ACS into ASCII chars.
               desired_char = Tput::ACSC::Data[desired_char]?.try(&.[2]) || '?'
             end
@@ -403,7 +403,7 @@ module Crysterm
         end
       end
 
-      if (acs)
+      if acs
         @main.write s.rmacs
         acs = false
       end
@@ -460,9 +460,9 @@ module Crysterm
       #  return insert_line_nc(n, y, top, bottom)
       # end
 
-      if (!tput.has?(&.change_scroll_region?) ||
+      if !tput.has?(&.change_scroll_region?) ||
          !tput.has?(&.delete_line?) ||
-         !tput.has?(&.insert_line?))
+         !tput.has?(&.insert_line?)
         STDERR.puts "Missing needed terminfo capabilities"
         return
       end
@@ -493,8 +493,8 @@ module Crysterm
     # Scroll down (up cursor-wise).
     # This will only work for top line deletion as opposed to arbitrary lines.
     def insert_line_nc(n, y, top, bottom)
-      if (!tput.has?(&.change_scroll_region?) ||
-         !tput.has?(&.delete_line?))
+      if !tput.has?(&.change_scroll_region?) ||
+         !tput.has?(&.delete_line?)
         STDERR.puts "Missing needed terminfo capabilities"
         return
       end
@@ -526,9 +526,9 @@ module Crysterm
       #   return delete_line_nc(n, y, top, bottom)
       # end
 
-      if (!tput.has?(&.change_scroll_region?) ||
+      if !tput.has?(&.change_scroll_region?) ||
          !tput.has?(&.delete_line?) ||
-         !tput.has?(&.insert_line?))
+         !tput.has?(&.insert_line?)
         STDERR.puts "Missing needed terminfo capabilities"
         return
       end
@@ -560,8 +560,8 @@ module Crysterm
     # Scroll down (up cursor-wise).
     # This will only work for top line deletion as opposed to arbitrary lines.
     def delete_line_nc(n, y, top, bottom)
-      if (!tput.has?(&.change_scroll_region?) ||
-         !tput.has?(&.delete_line?))
+      if !tput.has?(&.change_scroll_region?) ||
+         !tput.has?(&.delete_line?)
         STDERR.puts "Missing needed terminfo capabilities"
         return
       end
diff --git a/src/screen_interaction.cr b/src/screen_interaction.cr
index 8cd635c..e5aac30 100644
--- a/src/screen_interaction.cr
+++ b/src/screen_interaction.cr
@@ -77,7 +77,7 @@ module Crysterm
     # first gets the keys, then potentially passes onto children
     # elements.
     def _listen_keys(el : Widget? = nil)
-      if (el && !@keyable.includes? el)
+      if el && !@keyable.includes? el
         el.keyable = true
         @keyable.push el
       end
diff --git a/src/widget/bigtext.cr b/src/widget/bigtext.cr
index 6d283d5..c9b86c4 100644
--- a/src/widget/bigtext.cr
+++ b/src/widget/bigtext.cr
@@ -93,14 +93,14 @@ module Crysterm
       end
 
       def render
-        if (@width.nil? || @_shrink_width)
+        if @width.nil? || @_shrink_width
           # D O:
           # if (awidth - iwidth < @ratio.width * @text.length + 1)
           @width = @ratio.width * @text.size + 1
           @_shrink_width = true
           # end
         end
-        if (@height.nil? || @_shrink_height)
+        if @height.nil? || @_shrink_height
           # D O:
           # if (aheight - iheight < @ratio.height + 0)
           @height = @ratio.height
@@ -146,7 +146,7 @@ module Crysterm
               break if mcell.nil?
 
               lines[y]?.try(&.[x + mx]?).try do |cell|
-                if (style.fchar != ' ')
+                if style.fchar != ' '
                   cell.attr = default_attr
                   cell.char = mcell == 1 ? style.fchar : style.char
                 else
diff --git a/src/widget/input.cr b/src/widget/input.cr
index b3a14a8..63ae939 100644
--- a/src/widget/input.cr
+++ b/src/widget/input.cr
@@ -15,12 +15,12 @@ module Crysterm
             key = e.key
             ch = e.char
 
-            if (key == Tput::Key::Up || (@vi && ch == 'k'))
+            if key == Tput::Key::Up || (@vi && ch == 'k')
               scroll(-1)
               self.screen.render
               next
             end
-            if (key == Tput::Key::Down || (@vi && ch == 'j'))
+            if key == Tput::Key::Down || (@vi && ch == 'j')
               scroll(1)
               self.screen.render
               next
diff --git a/src/widget/layout.cr b/src/widget/layout.cr
index 3cdecbd..70d055d 100644
--- a/src/widget/layout.cr
+++ b/src/widget/layout.cr
@@ -91,7 +91,7 @@ module Crysterm
             el.left = llp.xl - xi
 
             # Make sure the position matches the highest width element
-            if (@layout == LayoutType::Grid)
+            if @layout == LayoutType::Grid
               # D O:
               # Compensate with width:
               # el.width = el.awidth + (highWidth - el.awidth)
@@ -124,20 +124,20 @@ module Crysterm
           end
 
           # Make sure the elements on lower rows gravitate up as much as possible
-          if (@layout == LayoutType::Inline)
+          if @layout == LayoutType::Inline
             above = nil
             abovea = Int32::MAX
             j = last_row_index
             while j < row_index
               l = @children[j]
-              if (!rendered?(l))
+              if !rendered?(l)
                 j += 1
                 next
               end
               abs = (el.left.as(Int) - (l.lpos.not_nil!.xi - xi)).abs
               # D O:
               # if (abs < abovea && (l.lpos.xl - l.lpos.xi) <= el.awidth)
-              if (abs < abovea)
+              if abs < abovea
                 above = l
                 abovea = abs
               end
@@ -151,7 +151,7 @@ module Crysterm
 
           # If our child overflows the Layout, return @overflow which contains
           # instruction what to do.
-          if (el.top.as(Int) + el.height.as(Int) > height)
+          if el.top.as(Int) + el.height.as(Int) > height
             return @overflow
           end
         }
@@ -161,17 +161,17 @@ module Crysterm
         _emit Crysterm::Event::PreRender
 
         coords = _render_coords
-        if (!coords)
+        if !coords
           @lpos = nil
           return
         end
 
-        if (coords.xl - coords.xi <= 0)
+        if coords.xl - coords.xi <= 0
           coords.xl = Math.max(coords.xl, coords.xi)
           return
         end
 
-        if (coords.yl - coords.yi <= 0)
+        if coords.yl - coords.yi <= 0
           coords.yl = Math.max(coords.yl, coords.yi)
           return
         end
@@ -187,7 +187,7 @@ module Crysterm
         style.padding.try &.adjust(coords, -1)
 
         @children.each_with_index do |el, i|
-          if (el.screen._ci != -1)
+          if el.screen._ci != -1
             el.index = el.screen._ci
             el.screen._ci += 1
           end
diff --git a/src/widget/message.cr b/src/widget/message.cr
index 26914e9..28c64ed 100644
--- a/src/widget/message.cr
+++ b/src/widget/message.cr
@@ -27,7 +27,7 @@ module Crysterm
           spawn do
             sleep 10.seconds
 
-            @ev_keypress = screen.on(Crysterm::Event::KeyPress) do |e|
+            @ev_keypress = screen.on(Crysterm::Event::KeyPress) do |_|
               #  ##return if e.key.try(&.name) == ::Tput::Key::Mouse # XXX
               #  #if scrollable?
               #  #  if (e.key == ::Tput::Key::Up) || # || (@vi && e.char == 'k') # XXX
diff --git a/src/widget/question.cr b/src/widget/question.cr
index f7470f1..d0d5bf2 100644
--- a/src/widget/question.cr
+++ b/src/widget/question.cr
@@ -74,7 +74,7 @@ module Crysterm
           c = e.char
           k = e.key
 
-          if (k != Tput::Key::Enter && k != Tput::Key::Escape && c != 'q' && c != 'y' && c != 'n')
+          if k != Tput::Key::Enter && k != Tput::Key::Escape && c != 'q' && c != 'y' && c != 'n'
             next
           end
 
diff --git a/src/widget/textarea.cr b/src/widget/textarea.cr
index 3e61c8d..d689e65 100644
--- a/src/widget/textarea.cr
+++ b/src/widget/textarea.cr
@@ -112,16 +112,16 @@ module Crysterm
         # That check is redundant because the below logic also does
         # the same (no-op if cursor is already at coords.)
 
-        if (cy == display.tput.cursor.y)
-          if (cx > display.tput.cursor.x)
+        if cy == display.tput.cursor.y
+          if cx > display.tput.cursor.x
             display.tput.cuf(cx - display.tput.cursor.x)
-          elsif (cx < display.tput.cursor.x)
+          elsif cx < display.tput.cursor.x
             display.tput.cub(display.tput.cursor.x - cx)
           end
-        elsif (cx == display.tput.cursor.x)
-          if (cy > display.tput.cursor.y)
+        elsif cx == display.tput.cursor.x
+          if cy > display.tput.cursor.y
             display.tput.cud(cy - display.tput.cursor.y)
-          elsif (cy < display.tput.cursor.y)
+          elsif cy < display.tput.cursor.y
             display.tput.cuu(display.tput.cursor.y - cy)
           end
         else
diff --git a/src/widget_children.cr b/src/widget_children.cr
index ad94114..940dfba 100644
--- a/src/widget_children.cr
+++ b/src/widget_children.cr
@@ -7,7 +7,7 @@ module Crysterm
     # Removes node from its parent.
     # This is identical to calling `parent.remove(self)`.
     def remove_from_parent
-      @parent.try { |p| p.remove self }
+      @parent.try(&.remove(self))
     end
 
     # Inserts `element` to list of children at a specified position (at end by default)
diff --git a/src/widget_content.cr b/src/widget_content.cr
index 1f12d7d..b85938d 100644
--- a/src/widget_content.cr
+++ b/src/widget_content.cr
@@ -89,7 +89,7 @@ module Crysterm
       ::Log.trace { "Parsing widget content: #{@content.inspect}" }
 
       colwidth = awidth - iwidth
-      if (@_clines.nil? || @_clines.empty? || @_clines.width != colwidth || @_clines.content != @content)
+      if @_clines.nil? || @_clines.empty? || @_clines.width != colwidth || @_clines.content != @content
         content =
           @content.gsub(/[\x00-\x08\x0b-\x0c\x0e-\x1a\x1c-\x1f\x7f]/, "")
             .gsub(/\e(?!\[[\d;]*m)/, "") # SGR
@@ -271,9 +271,9 @@ module Crysterm
         attrs.push attr
         raise "indexing error" unless attrs.size == j + 1
 
-        line.chars.each_with_index do |char, i|
+        line.chars.each_with_index do |char, _|
           if char == '\e'
-            if (c = line[1..].match(SGR_REGEX))
+            if c = line[1..].match(SGR_REGEX)
               attr = screen.attr2code(c[0], attr, default_attr)
             end
           end
@@ -306,7 +306,7 @@ module Crysterm
 
       margin += 1 if @scrollbar
       margin += 1 if is_a? Widget::TextArea
-      colwidth -= margin if (colwidth > margin)
+      colwidth -= margin if colwidth > margin
 
       lines.each_with_index do |line, no|
         align = default_state
@@ -346,12 +346,12 @@ module Crysterm
           # NOTE Done with loop+break due to https://github.com/crystal-lang/crystal/issues/1277
           loop do
             break unless i < line.size
-            while (line[i] == '\e')
-              while (line[i] && line[i] != 'm')
+            while line[i] == '\e'
+              while line[i] && line[i] != 'm'
                 i += 1
               end
             end
-            if (line[i]?.nil?)
+            if line[i]?.nil?
               break
             end
             total += 1
@@ -370,12 +370,12 @@ module Crysterm
               # XXX TODO
               # if (!screen.fullUnicode)
               # Try to find a char to break on.
-              if (i != line.size)
+              if i != line.size
                 j = i
                 # TODO how can the condition and subsequent IF ever match
                 # with the line[j] thing?
-                while ((j > i - 10) && (j > 0) && (j -= 1) && (line[j] != ' '))
-                  if (line[j] == ' ')
+                while (j > i - 10) && (j > 0) && (j -= 1) && (line[j] != ' ')
+                  if line[j] == ' '
                     i = j + 1
                   end
                 end
@@ -400,7 +400,7 @@ module Crysterm
           end
 
           # If only an escape code got cut off, add it to `part`.
-          if (line.matches? /^(?:\e[\[\d;]*m)+$/) # SGR
+          if line.matches? /^(?:\e[\[\d;]*m)+$/ # SGR
             outbuf[outbuf.size - 1] += line
             break :main
           end
@@ -501,17 +501,17 @@ module Crysterm
     end
 
     def insert_line(i = nil, line = "")
-      if (line.is_a? String)
+      if line.is_a? String
         line = line.split("\n")
       end
 
-      if (i.nil?)
+      if i.nil?
         i = @_clines.ftor.size
       end
 
       i = Math.max(i, 0)
 
-      while (@_clines.fake.size < i)
+      while @_clines.fake.size < i
         @_clines.fake.push("")
         @_clines.ftor.push([@_clines.push("").size - 1])
         @_clines.rtof[@_clines.fake.size - 1]
@@ -523,7 +523,7 @@ module Crysterm
       # diff
       # real
 
-      if (i >= @_clines.ftor.size)
+      if i >= @_clines.ftor.size
         real = @_clines.ftor[@_clines.ftor.size - 1]
         real = real[-1] + 1
       else
@@ -538,9 +538,9 @@ module Crysterm
 
       diff = @_clines.size - start
 
-      if (diff > 0)
+      if diff > 0
         pos = _get_coords
-        if (!pos || pos == 0)
+        if !pos || pos == 0
           return
         end
 
@@ -548,7 +548,7 @@ module Crysterm
         base = @child_base
         visible = real >= base && real - base < height
 
-        if (pos && visible && screen.clean_sides(self))
+        if pos && visible && screen.clean_sides(self)
           screen.insert_line(diff,
             pos.yi + itop + real - base,
             pos.yi,
@@ -558,7 +558,7 @@ module Crysterm
     end
 
     def delete_line(i = nil, n = 1)
-      if (i.nil?)
+      if i.nil?
         i = @_clines.ftor.size - 1
       end
 
@@ -571,7 +571,7 @@ module Crysterm
       # diff
       real = @_clines.ftor[i][0]
 
-      while (n > 0)
+      while n > 0
         n -= 1
         @_clines.fake.delete_at i
       end
@@ -583,9 +583,9 @@ module Crysterm
       # XXX clear_last_rendered_position() without diff statement?
       height = 0
 
-      if (diff > 0)
+      if diff > 0
         pos = _get_coords
-        if (!pos || pos == 0)
+        if !pos || pos == 0
           return
         end
 
@@ -594,7 +594,7 @@ module Crysterm
         base = @child_base
         visible = real >= base && real - base < height
 
-        if (pos && visible && screen.clean_sides(self))
+        if pos && visible && screen.clean_sides(self)
           screen.delete_line(diff,
             pos.yi + itop + real - base,
             pos.yi,
@@ -602,7 +602,7 @@ module Crysterm
         end
       end
 
-      if (@_clines.size < height)
+      if @_clines.size < height
         clear_last_rendered_position
       end
     end
@@ -637,7 +637,7 @@ module Crysterm
 
     def set_line(i, line)
       i = Math.max(i, 0)
-      while (@_clines.fake.size < i)
+      while @_clines.fake.size < i
         @_clines.fake.push("")
       end
       @_clines.fake[i] = line
@@ -679,7 +679,7 @@ module Crysterm
     end
 
     def push_line(line)
-      if (!@content)
+      if !@content
         return set_line(0, line)
       end
       insert_line(@_clines.fake.size, line)
diff --git a/src/widget_rendering.cr b/src/widget_rendering.cr
index 78d138e..3e434ff 100644
--- a/src/widget_rendering.cr
+++ b/src/widget_rendering.cr
@@ -51,12 +51,12 @@ module Crysterm
         return
       end
 
-      if (coords.xl - coords.xi <= 0)
+      if coords.xl - coords.xi <= 0
         coords.xl = Math.max(coords.xl, coords.xi)
         return
       end
 
-      if (coords.yl - coords.yi <= 0)
+      if coords.yl - coords.yi <= 0
         coords.yl = Math.max(coords.yl, coords.yi)
         return
       end
@@ -107,7 +107,7 @@ module Crysterm
       #   content = clines.join('\n')
       # end
 
-      if (coords.base >= @_clines.ci.size)
+      if coords.base >= @_clines.ci.size
         # Can be @_pcontent, but this is the same here, plus not_nil!
         ci = content.size
       end
@@ -138,7 +138,7 @@ module Crysterm
 
       # If we're in a scrollable text box, check to
       # see which attributes this line starts with.
-      if (ci > 0)
+      if ci > 0
         attr = @_clines.attr.try(&.[Math.min(coords.base, @_clines.size - 1)]?) || 0
       end
 
@@ -185,7 +185,7 @@ module Crysterm
       # Determine where to place the text if it's vertically aligned.
       if @align.v_center? || @align.bottom?
         visible = yl - yi
-        if (@_clines.size < visible)
+        if @_clines.size < visible
           if @align.v_center?
             visible = visible // 2
             visible -= @_clines.size // 2
@@ -199,8 +199,8 @@ module Crysterm
       # Draw the content and background.
       # yi.step to: yl-1 do |y|
       (yi...yl).each do |y|
-        if (!lines[y]?)
-          if (y >= screen.aheight || yl < ibottom)
+        if !lines[y]?
+          if y >= screen.aheight || yl < ibottom
             break
           else
             next
@@ -229,7 +229,7 @@ module Crysterm
           # end
 
           # Handle escape codes.
-          while (ch == '\e')
+          while ch == '\e'
             cnt = content[(ci - 1)..]
             if c = cnt.match SGR_REGEX_AT_BEGINNING
               ci += c[0].size - 1
@@ -248,25 +248,25 @@ module Crysterm
           end
 
           # Handle newlines.
-          if (ch == '\t')
+          if ch == '\t'
             # TODO this should be something like ch = bch * style.tab_size, or just style.tab_char,
             # (although not as simple as that.)
             ch = bch
           end
-          if (ch == '\n')
+          if ch == '\n'
             # If we're on the first cell and we find a newline and the last cell
             # of the last line was not a newline, let's just treat this like the
             # newline was already "counted".
-            if ((x == xi) && (y != yi) && (content[ci - 2]? != '\n'))
+            if (x == xi) && (y != yi) && (content[ci - 2]? != '\n')
               x -= 1
               next
             end
             # We could use fill_region here, name the
             # outer loop, and continue to it instead.
             ch = bch
-            while (x < xl)
+            while x < xl
               cell = lines[y][x]?
-              if (!cell)
+              if !cell
                 break
               end
               if alpha = style.alpha?
@@ -292,7 +292,7 @@ module Crysterm
 
           # TODO
           # if (screen.full_unicode && content[ci - 1])
-          if (content[ci - 1]?)
+          if content[ci - 1]?
             # point = content.codepoint_at(ci - 1) # Unused
             # TODO
             # # Handle combining chars:
diff --git a/src/widget_scrolling.cr b/src/widget_scrolling.cr
index 8fc97e1..d3b3e35 100644
--- a/src/widget_scrolling.cr
+++ b/src/widget_scrolling.cr
@@ -77,7 +77,7 @@ module Crysterm
       i = get_scroll_height
       # p
 
-      if (height < i)
+      if height < i
         if @always_scroll
           p = @child_base / (i - height)
         else
@@ -153,26 +153,26 @@ module Crysterm
         @child_offset += offset
       end
 
-      if (@child_offset > visible - 1)
+      if @child_offset > visible - 1
         d = @child_offset - (visible - 1)
         @child_offset -= d
         @child_base += d
-      elsif (@child_offset < 0)
+      elsif @child_offset < 0
         d = @child_offset
         @child_offset += -d
         @child_base += d
       end
 
-      if (@child_base < 0)
+      if @child_base < 0
         @child_base = 0
-      elsif (@child_base > @base_limit)
+      elsif @child_base > @base_limit
         @child_base = @base_limit
       end
 
       # Find max "bottom" value for
       # content and descendant elements.
       # Scroll the content if necessary.
-      if (@child_base == base)
+      if @child_base == base
         return emit Crysterm::Event::Scroll
       end
 
@@ -186,19 +186,19 @@ module Crysterm
       # max = get_scroll_height - (aheight - iheight)
 
       max = @_clines.size - (aheight - iheight)
-      if (max < 0)
+      if max < 0
         max = 0
       end
       emax = _scroll_bottom - (aheight - iheight)
-      if (emax < 0)
+      if emax < 0
         emax = 0
       end
 
       @child_base = Math.min @child_base, Math.max(emax, max)
 
-      if (@child_base < 0)
+      if @child_base < 0
         @child_base = 0
-      elsif (@child_base > @base_limit)
+      elsif @child_base > @base_limit
         @child_base = @base_limit
       end
 
@@ -214,10 +214,10 @@ module Crysterm
         b = p.yl - ibottom - 1
         d = @child_base - base
 
-        if (d > 0 && d < visible)
+        if d > 0 && d < visible
           # scrolled down
           screen.delete_line(d, t, t, b)
-        elsif (d < 0 && -d < visible)
+        elsif d < 0 && -d < visible
           # scrolled up
           d = -d
           screen.insert_line(d, t, t, b)
diff --git a/src/widget_size.cr b/src/widget_size.cr
index 7170de9..d1c469b 100644
--- a/src/widget_size.cr
+++ b/src/widget_size.cr
@@ -175,7 +175,7 @@ module Crysterm
           ret.xl += ileft
           ret.xi += ileft
         end
-        if (el.top.nil? && !el.bottom.nil?)
+        if el.top.nil? && !el.bottom.nil?
           ret.yl = yi + (ret.yl - ret.yi)
           ret.yi = yi
           # Maybe just do this no matter what.
@@ -258,9 +258,9 @@ module Crysterm
       end
       # end
 
-      if (@height.nil? && (@top.nil? || @bottom.nil?) &&
-         (!@scrollable || @_is_list))
-        if (@top.nil? && !@bottom.nil?)
+      if @height.nil? && (@top.nil? || @bottom.nil?) &&
+         (!@scrollable || @_is_list)
+        if @top.nil? && !@bottom.nil?
           yi = yl - h - iheight # (iheight == 1 ? 0 : iheight)
         else
           yl = yi + h + iheight # (iheight == 1 ? 0 : iheight)
@@ -278,7 +278,7 @@ module Crysterm
       yll = yl
 
       # Figure out which one is bigger and use it.
-      if (minimal_children_rectangle.xl - minimal_children_rectangle.xi > minimal_content_rectangle.xl - minimal_content_rectangle.xi)
+      if minimal_children_rectangle.xl - minimal_children_rectangle.xi > minimal_content_rectangle.xl - minimal_content_rectangle.xi
         xi = minimal_children_rectangle.xi
         xl = minimal_children_rectangle.xl
       else
@@ -286,7 +286,7 @@ module Crysterm
         xl = minimal_content_rectangle.xl
       end
 
-      if (minimal_children_rectangle.yl - minimal_children_rectangle.yi > minimal_content_rectangle.yl - minimal_content_rectangle.yi)
+      if minimal_children_rectangle.yl - minimal_children_rectangle.yi > minimal_content_rectangle.yl - minimal_content_rectangle.yi
         yi = minimal_children_rectangle.yi
         yl = minimal_children_rectangle.yl
       else
@@ -295,13 +295,13 @@ module Crysterm
       end
 
       # Recenter shrunken elements.
-      if (xl < xll && @left == "center")
+      if xl < xll && @left == "center"
         xll = (xll - xl) // 2
         xi += xll
         xl += xll
       end
 
-      if (yl < yll && @top == "center")
+      if yl < yll && @top == "center"
         yll = (yll - yl) // 2
         yi += yll
         yl += yll
diff --git a/test-auto/hello/main.cr b/test-auto/hello/main.cr
index 92a2a7f..3ef2f67 100644
--- a/test-auto/hello/main.cr
+++ b/test-auto/hello/main.cr
@@ -13,7 +13,7 @@ w = Widget::Box.new \
   parse_tags: false,
   style: Style.new(fg: "yellow", bg: "blue", border: true)
 
-s.on(Event::KeyPress) { |e| exit }
+s.on(Event::KeyPress) { |_| exit }
 
 s.on(Event::Rendered) {
   if ARGV.includes? "--test-auto"
diff --git a/test/widget-prompt.cr b/test/widget-prompt.cr
index 1622aeb..9529daa 100644
--- a/test/widget-prompt.cr
+++ b/test/widget-prompt.cr
@@ -72,9 +72,9 @@ module Crysterm
     end
   end
 
-  prompt.read_input("Question?", "") do |err, val|
+  prompt.read_input("Question?", "") do |_, _|
     STDERR.puts :q1
-    question.ask("Question?") do |err, val|
+    question.ask("Question?") do |_, _|
       STDERR.puts :q2
       msg.display("Hello world!", 3.seconds) do          # |err|
         msg.display("Hello world again!", -1.seconds) do # |err|