Top Highlights

• Let’s emphasize that the equality check is always strict.
• Any expression can be a switch/case argument
• For 0, 1, the first alert runs. For 2 the second alert runs. But for 3, the result of the prompt is a string "3", which is not strictly equal === to the number 3. So we’ve got a dead code in case 3! The default variant will execute.
• Please note: the break at the bottom is not required. But we put it to make the code future-proof.
• f there is no break then the execution continues with the next case without any checks

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