- Tags: Conditional, JS Statement
- Categories: JavaScript Reference, JavaScript Statements, Reference
Quick Reference
The switch statement executes different blocks of code depending on set conditions, and uses the break keyword to break out of the switch block once it determines which code block to run.
<!-- html element to place output -->
<p id="my_output"></p>
In the following, we use x as our value (let’s say it was input by the user in a form field).
Then we use the switch statement to evaluate x to determine which “case” it matches. When it finds the matching “case” it adds a specified string to the my_car variable and breaks (stops running any code within the switch block).
Finally, it outputs the information to the HTML element.
// variables
var x = 'Maserati';
var my_car;
// switch statement
switch(x) {
case 'Lamborghini':
my_car = 'I have a Lamborghini.';
break;
case 'Ferrari':
my_car = 'I have a Ferrari.';
break;
case 'Maserati':
my_car = 'I have a Maserati.';
break;
default:
my_car = 'I do not own a car.';
}
// output to HTML element
document.getElementById('my_output').innerHTML = my_car;
Output
I have a Maserati.
Syntax
switch(expression) {
case value:
code to be executed
break;
case value:
code to be executed
break;
default:
code to be executed
}
We’d like to acknowledge that we learned a great deal of our coding from W3Schools and TutorialsPoint, borrowing heavily from their teaching process and excellent code examples. We highly recommend both sites to deepen your experience, and further your coding journey. We’re just hitting the basics here at 1SMARTchicken.
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JAVASCRIPT NOTES:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
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