JavaScript Switch Statement
The switch statement in JavaScript is used to perform different actions based on different conditions.
It evaluates an expression, matches the expression's value to a case clause, and executes the statements associated with that case.
Syntax
switch (expression) {
case value1:
// Statements to execute if expression === value1
break;
case value2:
// Statements to execute if expression === value2
break;
// Additional cases...
default:
// Statements to execute if expression does not match any case
}
Example
let day = 2;
let dayName;
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("Today is " + dayName);
The break Keyword
When JavaScript reaches a break keyword, it breaks out of the switch block.
This will stop the execution inside the switch block.
It is not necessary to break the last case in a switch block. The block breaks (ends) there anyway.