How to write multiple conditions with a switch case in JavaScript

In this tutorial, you will learn to write multiple OR conditions with a switch-case statement in JavaScript

Suppose you have multiple OR conditions in a if statement which you want to replaced with a switch statement.

if (value === 1 || value === 3 || value === 5) {
  ...
} else {
  ...
}

The basic usage of switch statement is to replace lengthy if-else-if statement with a more readable case statements and a default statement.

But a single case statement does not support OR conditions like

// not supported

switch value {
  case 1 || 3 || 5:
    console.log("odd number");
    break;
  default:
    break;
}

The above example does not work because the switch statement can only have one value per case.

To implement multiple conditions in a switch statement you have to write multiple case with conditions without a break; statement.

Example

switch value {
  case 1:
  case 3:
  case 5:
    console.log("odd number");
    break;
  default:
    break;
}

// equivalent to 

if (value === 1 || value === 3 || value === 5) {
  console.log("odd number");
} else {}

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