JavaScript switch with logical operators?

by

When switch is interpreted, the expression in the parentheses is compared to values of the particular cases.

So in your case the value of count would be compared to the values of 2, count > 3 and count >= 4. And that won’t work. Although you can rewrite it and compare to true to get it working:

switch (true) {
    case (count == 2):
        document.write("hi");
        break;
    case (count > 3):
        document.write("bye");
        break;
    case (count >= 4):
        document.write("lol");
        break;
}

But that’s not how switch is supposed to be used.

Use if statements instead:

if (count == 2) {
    document.write("hi");
} else if (count > 3) {
    document.write("bye");
} else if (count >= 4) {
    document.write("lol");
}

Edit    Since you use the switch cases exclusively (break if a case matches), my switch-to-if/else translation is correct.

But the count >= 4 case/branch will never be applied since count > 3 is true (also) for count values greater or equal 4.

To fix this problem (write “bye” and “lol” for values greater or equal 4), remove the last else to make the last if statement independent from the preceding:

if (count == 2) {
    document.write("hi");
} else if (count > 3) {
    document.write("bye");
}
if (count >= 4) {
    document.write("lol");
}

More Related Contents:

  1. Turn if-else-if statement into switch statement in Javascript
  2. Switch statement for multiple cases in JavaScript
  3. Switch statement for greater-than/less-than
  4. Expression inside switch case statement
  5. Switch on ranges of integers in JavaScript [duplicate]
  6. How can I use ranges in a switch case statement using JavaScript?
  7. Is it safe to assume strict comparison in a JavaScript switch statement?
  8. Switch Case not showing correct results
  9. Can I use a case/switch statement with two variables?
  10. Test for multiple cases in a switch, like an OR (||)
  11. Why is Break needed when using Switch?
  12. Switch statement for string matching in JavaScript
  13. How to use dynamic tailwind classes with JS switch statement and pass them correctly in Vue?
  14. Switch case with conditions
  15. switch statement to compare values greater or less than a number
  16. Sending Variable From Php To Js [duplicate]
  17. jQuery doesn’t give a proper output, but gives these [closed]
  18. Avoid dropdown menu close on click inside
  19. Why does this JavaScript code print “undefined” on the console?
  20. How to clear the contents of an iFrame from another iFrame
  21. Simulate Keypress With jQuery
  22. Showing C# tags in Jekyll Github pages using Highlight.js
  23. XML to JavaScript Object
  24. I want to store Javascript array as a Cookie
  25. Failed to execute ‘removeChild’ on ‘Node’
  26. JavaScript break sentence by words
  27. iframe Auto Adjust Height as content changes
  28. How can I paginate in descending order by child value with firebase?
  29. Why is “forEach not a function” for this object?
  30. Automatically scroll down chat div

Leave a Comment