as the 1967 full scale war not the small gaza and lebanon operations . the world forgets the capability of the mighty IDF when full mobilization of half a million determined israeli soldiers fight for survival they are THE ISRAELI LION UNCHAINED.
Although it sounds nice to imagine Israel, alone, taking on Iran, I don't think that will ever happen. If it happens it will be in conjunction with the United States. As far as the IDF is concerned their fight will have to be against Iranian surrogates in Israel' physical area as I don't believe anyone thinks Israel nor the U.S will invade Iran. Any attack on Iran will come from the air and pinpoint Iran's nuclear and fighting capabilities being very careful not to kill civilians.