let i = 9; switch (true) { case (i < 7 && i > 2): console.log('a') break; case check(i): console.log('c') break; default: console.log('s') break; } let x = '123'; switch (x) { case (x < 7 && x > 2): console.log('aaaa') break; case check(x): console.log('ccc') break; default: console.log('ssss') break; } function check(i) { return '123'; }