Switch in TypeScript

In TypeScript, switch statements are used to execute different blocks of code based on the value of a particular variable. The syntax for a switch statement is as follows:

switch(variable) {
  case value1:
    // code to be executed when variable === value1
    break;
  case value2:
    // code to be executed when variable === value2
    break;
  .
  .
  .
  default:
    // code to be executed when none of the cases match
}

Here's an example of a switch statement in TypeScript:

let day: number = 2;
let dayName: string;
switch(day) {

  case 1:

    dayName = "Monday";

    break;

  case 2:

    dayName = "Tuesday";

    break;

  case 3:

    dayName = "Wednesday";

    break;

  case 4:

    dayName = "Thursday";

    break;

  case 5:

    dayName = "Friday";

    break;

  case 6:

    dayName = "Saturday";

    break;

  case 7:

    dayName = "Sunday";

    break;

  default:

    dayName = "Invalid day";

}
console.log(dayName); // Output: Tuesday

In this example, the switch statement takes a variable day as its argument and compares its value to each case in turn, executing the code associated with the first matching case and breaking out of the switch statement using the break keyword.

If none of the cases match, the default block of code is executed instead. In this example, if the value of day was 8, the default block of code would be executed, setting the value of dayName to "Invalid day".