The Japanese yen surged against the dollar on Friday, extending gains that came the previous day after officials in Tokyo said they stood ready to intervene in the foreign exchange market. Friday saw the Japanese currency rise as much as 0.7% versus the greenback, extending a Thursday rally that saw it jump by as much as 3% against the dollar. By 5:35 a.m. ET, the yen had pared a lot of Friday's gains, but erased the losses incurred since the U.S.-Iran war began on Feb. 28. On Thursday, Reuters