Use abstractions instead of comments

Instead of commenting what a piece of code does, create a function with a name that describes what it does.

The code below the comment might change without the comment, and in time, the comment will become outdated, possibly wrong, and end up as a lie.

// enable dragging and dropping of images window.addEventListener('dragover', preventDefault); window.addEventListener('dragenter', preventDefault); window.addEventListener('drop', files => controller.readDroppedFiles(files));
Instead you should create a function with a good descriptive name. function enableDragAndDropOfImagesFiles(controller) { window.addEventListener('dragover', preventDefault); window.addEventListener('dragenter', preventDefault); window.addEventListener('drop', files => controller.readDroppedFiles(files)); }
Then call that function. The comment is no longer needed. enableDragAndDropOfImagesFiles(controller);