If Iran explodes a small nuke, Israel will hit them with 40 or 50. Bye-bye, Iran.
No, world opinion would turn on Israel if they launched such as attack. It would be gone. I do not think Israel would send all the bombs they had—because it would only spell doom for them. Other nation could hit them with WMD even if they do not have nukes. World opinion is not in favor of what they are doing in Gaza right now—so I do not see this as possible—Jews, unlike Islamic people, are not suicidal.
A) Israel has a lot more than 40-50 nukes. That’s only ~ 1/4 of their likely inventory.
B) If Israel is literally at the precipice “Bibi ain’t giving no ear to world opinion”. Iran exploding nukes IS Israel at the precipice. Or have you not been listening / watching and... reading the Quran?
IF Iran left their nuke capability vulnerable, Israel might well try to take it out by non-nuke means 1st. But most analysts think that would fail without massive US involvement. That (failure) would leave Israel in a worse spot yet.