function map(mode, lhs, rhs, opts)
	local options = { noremap = true, silent = true }
	if opts then
		options = vim.tbl_extend("force", options, opts)
	end
	vim.keymap.set(mode, lhs, rhs, options)
end
--This code just maps vim.keymap.set() to something easier to type. Also, typing { noremap = true, silent = true } won’t be needed, because that is also implemented in the function.

vim.g.mapleader = " "

map("i", "jk", "<esc>") -- remap escape

map("n", "<leader>+", ":bNext<cr>") --switch tabs
map("n", "<leader>n", ":Neotree toggle<cr>") --open Nerdtree
map("n", "<leader>z", ":ZenMode<cr>") --open ZenMode (distraction-free)
map("n", "<leader>d", ":ToggleDiag<cr>") -- toggle all diagnostics