A switch statement is a control flow statement in JavaScript that allows you to test a variable against a series of cases. The switch statement evaluates an expression and executes the code associated with the matching case.
Here is the basic syntax for a switch statement:
switch(expression) { case value1: // code block break; case value2: // code block break; default: // code block }
The expression is the variable that you want to test, and the case statements are the possible values that the expression might have. The default statement is optional, and it is executed if none of the case statements match the expression.
Let’s look at an example to see how it works:
let fruit = “banana”; switch(fruit) { case “apple”: console.log(“I love apples”); break; case “banana”: console.log(“I love bananas”); break; case “orange”: console.log(“I love oranges”); break; default: console.log(“I don’t like this fruit”); }
In this example, the variable fruit is being tested against the different cases. Since the value of fruit is “banana”, the code block associated with the “banana” case will be executed, and the output will be “I love bananas”.
If the value of fruit had been “apple”, the output would have been “I love apples”, and so on.
One important thing to note is that the break statement is used after each case block. This is to ensure that the code execution stops after the matching case is found. If you don’t include the break statement, the code will continue to execute through the next cases, even if they don’t match the expression.
CONCLUSION:
In conclusion, the switch statement in JavaScript is a powerful tool that allows you to test a variable against a series of cases. It can help you write cleaner and more efficient code by simplifying complex if-else statements.
Remember to always include the break statement after each case block to ensure that the code execution stops after the matching case is found.