Which type of Java script code it is?

<script nonce="s8Ma5GuzpDyRLTm1LvCMFg">const imageUrl =  null ;
      function bgImgLoaded() {
        if (!globals.headerBgImgLoaded) {
          globals.headerBgImgLoaded = new Date().getTime();
        } else {
          globals.headerBgImgLoaded();
        }
      }
      if (imageUrl) {
        const img = new Image();
        img.src = imageUrl;
        img.onload = bgImgLoaded;
        globals.headerBgImgExists = true;
      } else {
        globals.headerBgImgExists = false;
      }
      </script>

what’s your question about this code?

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (’).

help, where we use this JavaScript code ?

what should it do? where did you found it?

The code is broken.

imgUrl is set as null so the “if else” block does nothing but setting globals.headerBgImgExist to false.

Even if that bug would be fixed img.onload = bgImgLoaded; would do nothing but assigning the function as a value when probably would be expected to be called.

Also “img” variable is not used anywhere … very odd (setting source to null). And cannot be used anywhere else as it is scoped to the “if else” block.

Furthermore, if there is any code that uses “globals.headerBgImgExists” is going to have a bug probably.

Seems to me like code written by someone who doesn’t know JS.

thank you for explaining it very well