diff --git a/.config/nvim/lua/my/keymaps.lua b/.config/nvim/lua/my/keymaps.lua
index d5be4be..ff6b97e 100644
--- a/.config/nvim/lua/my/keymaps.lua
+++ b/.config/nvim/lua/my/keymaps.lua
@@ -4,22 +4,20 @@ end
 
 vim.g.mapleader = ' '   -- <Leader>
 
+local format = string.format
+
 -- buffers
 map('n', '<Leader>b',   ':buffers<CR>:buffer<Space>')
-map('n', '<M-Left>',    ':bprevious<cr>')
-map('n', '<M-Right>',   ':bnext<cr>')
-map('i', '<M-Left>',    '<esc>:bprevious<cr>')
-map('i', '<M-Right>',   '<esc>:bnext<cr>')
+for key, cmd in pairs({ Left = 'bprevious', Right = 'bnext' }) do
+    map('n', format('<M-%s>', key), format(':%s<cr>', cmd))
+    map('i', format('<M-%s>', key), format('<esc>:%s<cr>', cmd))
+end
 
 --windows
-map('n', '<M-S-Left>',  ':wincmd h<cr>')
-map('n', '<M-S-Down>',  ':wincmd j<cr>')
-map('n', '<M-S-Up>',    ':wincmd k<cr>')
-map('n', '<M-S-Right>', ':wincmd l<cr>')
-map('i', '<M-S-Left>',  '<esc>:wincmd h<cr>')
-map('i', '<M-S-Down>',  '<esc>:wincmd j<cr>')
-map('i', '<M-S-Up>',    '<esc>:wincmd k<cr>')
-map('i', '<M-S-Right>', '<esc>:wincmd l<cr>')
+for key, letter in pairs({ Left = 'h', Down = 'j', Up = 'k', Right = 'l' }) do
+    map('n', format('<M-S-%s>', key), format(':wincmd %s<cr>', letter))
+    map('i', format('<M-S-%s>', key),  format('<esc>:wincmd %s<cr>', letter))
+end
 
 -- remove word
 map('n', '<M-BS>',      'db')
@@ -77,7 +75,6 @@ map('n', '<C-F>', '==') -- re-indent line
 
 -- select text with shift + arrow
 for _, key in ipairs({ 'Left', 'Up', 'Down', 'Right' }) do
-    local format = string.format
     map({ 'n', 'i' }, format('<S-%s>', key), format('<Esc>v<%s>', key))
     map({ 'v' }, format('<S-%s>', key), format('<%s>', key))
 end