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This article is about how js replaces if/else with switch case. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Replace if/else with switch case

Switch case performs better than if/else, and the code looks clearer.

If (1 = = month) {days = 31;} else if (2 = = month) {days = IsLeapYear (year)? 29: 28;} else if (3 = = month) {days = 31;} else if (4 = = month) {days = 30;} else if (5 = = month) {days = 31;} else if (6 = = month) {days = 30;} else if (7 = month) {days = 31;} else if (8 = month) {days = 31;} else if (9 = month) {days = 30 } else if (10 = = month) {days = 31;} else if (11 = = month) {days = 30;} else if (12 = = month) {days = 31;}

Use switch...case to overwrite:

Switch (month) {case 1: days = 31; break; case 2: days = IsLeapYear (year)? 29: 28; break; case 3: days = 31; break; case 4: days = 30; break; case 5: days = 31; break; case 6: days = 30; break; case 7: days = 31; break; case 8: days = 31; break; case 9: days = 30; break Case 10: days = 31; break; case 11: days = 30; break; case 12: days = 31; break; default: break;}

It looks a little more concise. You can rewrite if...else using arrays or objects as appropriate.

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