Comparison

util.iterators: Add iterator wrapper that works like select(n, ...) applied to original iterator

comparison

equal deleted inserted replaced

-:8ca7f1c2c660
+:4b4cf0167391
 	local key, val;
 	return function (_t)
 		key, val = next(_t, key);
 		return val;
 	end, t;
+end
+-- Iterate over the n:th return value
+function it.select(n, f, s, var)
+	return function (_s)
+		local ret = pack(f(_s, var));
+		var = ret[1];
+		return ret[n];
+	end, s, var;
 end
 -- Given an iterator, iterate only over unique items
 function it.unique(f, s, var)
 	local set = {};