Does the switch statement use === or ==? [duplicate]

Question

Does the Javascript switch statement compare strictly or by type-converting?

Answer 1

It only uses strict comparison. In particular, it never falls back to type coercion even when no strict matches are found — it will immediately skip to the default clause, if any. From MDN:

The program first looks for a case clause whose expression evaluates to the same value as the input expression (using strict comparison, ===) and then transfers control to that clause, executing the associated statements. If no matching case clause is found, the program looks for the optional default clause...