@@ -58,6 +58,56 @@
 fn.pick = function(lst)
 	local keys = fn.keys(lst)
 	return keys[math.random(#keys)]
 end
+
+fn.unpack = function(tbl,i)
+	if i and #tbl == i then return tbl[i] end
+	i = i or 1
+	return tbl[i], fn.unpack(tbl, i+1)
+end
+
+fn.each = function(tbl,fn)
+	local r = {}
+	for k,v in pairs(tbl) do
+		r[#r+1] = fn(v,k)
+	end
+	return r
+end
+
+fn.each_o = function(tbl,fn)
+	local keys = fn.keys(tbl)
+	table.sort(keys)
+	return fn.each(keys, function(k,i)
+		return fn(tbl[k],k,i)
+	end)
+end
+
+fn.iter = function(tbl,fn)
+	for i=1,#tbl do
+		fn(tbl[i], i)
+	end
+end
+
+fn.map = function(tbl,fn)
+	local new = {}
+	for k,v in pairs(tbl) do
+		local nv, nk = fn(v, k)
+		new[nk or k] = nv
+	end
+	return new
+end
+
+fn.fold = function(tbl,fn,acc)
+	if #tbl == 0 then
+		fn.each_o(tbl, function(v)
+			acc = fn(acc, v, k)
+		end)
+	else
+		for i=0,#tbl do
+			acc = fn(acc,tbl[i],i)
+		end
+	end
+	return acc
+end
 
 return fn