How can I check for an empty/undefined/null string in JavaScript?

javascriptnullis-empty
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How can I know which radio button is selected via jQuery?

javascripthtmljqueryjquery-selectorsradio-button
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map function for objects (instead of arrays)

javascriptnode.jsmap-functionfunctional-programming
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Smooth scrolling when clicking an anchor link

javascriptjqueryscrollhyperlinkanchor
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Using jQuery to center a DIV on the screen

javascripthtmljquerycsslayout
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