To check an empty field is need null and ""?

1

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if ($(this).val() == null || $(this).val() == '') {
  // do
}

 <input value="">

Both gives back false?

I saw many tutorial have in this to check for sure the field is empty but why need both? Can anyone explain? Why not just with null? Thanks!

2

Since the val is a string, you can just check whether it’s truthy. Any non-empty string is considered truthy

if ($(this).val()) { ... do stuff ... }
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