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The switch statement is used to perform different actions based on different conditions.
switch(expression) {
case x:
// code block
break;
case y:
// code block
break;
default:
// code block
}
The switch expression is evaluated once.
The value of the expression is compared with the values of each case.
If there is a match, the associated block of code is executed.
If there is no match, the default code block is executed.
switch (new Date().getDay()) {
case 0:
day = "Sunday";
break;
case 1:
day = "Monday";
break;
case 2:
day = "Tuesday";
break;
case 3:
day = "Wednesday";
break;
case 4:
day = "Thursday";
break;
case 5:
day = "Friday";
break;
case 6:
day = "Saturday";
}
When JavaScript reaches a break keyword, it breaks out of the switch block.
This will stop the execution inside the switch block.
If you omit the break statement, the next case will be executed even if the evaluation does not match the case.
It is not necessary to break the last case in a switch block. The block breaks (ends) there anyway.
The default keyword specifies the code to run if there is no case match.
switch (new Date().getDay()) {
case 6:
text = "Today is Saturday";
break;
case 0:
text = "Today is Sunday";
break;
default:
text = "Looking forward to the Weekend";
}
The default case does not have to be the last case in a switch block.
If default is not the last case in the switch block, remember to end the default case with a break.
switch (new Date().getDay()) {
default:
text = "Looking forward to the Weekend";
break;
case 6:
text = "Today is Saturday";
break;
case 0:
text = "Today is Sunday";
}
Sometimes you will want different switch cases to use the same code.
In this example case 4 and 5 share the same code block, and 0 and 6 share another code block.
switch (new Date().getDay()) {
case 4:
case 5:
text = "Soon it is Weekend";
break;
case 0:
case 6:
text = "It is Weekend";
break;
default:
text = "Looking forward to the Weekend";
}
If multiple cases matches a case value, the first case is selected.
If no matching cases are found, the program continues to the default label.
If no default label is found, the program continues to the statement(s) after the switch.
Switch cases use strict comparison (===).
The values must be of the same type to match.
A strict comparison can only be true if the operands are of the same type.
let x = "0";
switch (x) {
case 0:
text = "Off";
break;
case 1:
text = "On";
break;
default:
text = "No value found";
}
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