Switch Statement in JavaScript

1.  Purpose

• The switch statement provides a more concise way to execute different blocks of code based on different values of a single expression. It’s like a multi-way if…else.

2. Syntax

switch(expression) {
case value1:
  // Code to be executed if expression === value1
break;
case value2:
  // Code to be executed if expression === value2
break;
case value3:
  // Code to be executed if expression === value3
break;
  // ... more cases
default:
  // Code to be executed if none of the cases match
}

• expression: The value to be evaluated.
• case value1: Represents a possible value for the expression.
• break; Crucial! It prevents the code from falling through to the next case even if it matches.
• default: (Optional) This block is executed if none of the case values match the expression.

3. Example:

let day = "Sunday";
switch (day) {
case "Monday":
  console.log("It's Monday!");
break;
case "Tuesday":
  console.log("It's Tuesday!");
break;
  case "Wednesday":
console.log("It's Wednesday!");
break;
// ... more cases
case "Sunday":
  console.log("It's the weekend!");
break;
default:
  console.log("It's another day.");
}

In this example:

• The switch statement checks the value of the day variable.
• Since the day is “Sunday”, the code in the case “Sunday” block will execute, and “It’s the weekend!” will be printed to the console.