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Why would someone put a # in front of a value in jQuery?

I'm very confused on this aspect.

2 Answers

The # symbol indicates that it and whatever following it is an ID selector http://api.jquery.com/id-selector/

The # is for selecting elements with an id, like the name in a form field. https://learn.jquery.com/using-jquery-core/faq/how-do-i-select-an-item-using-class-or-id/