Get all non-unique values (i.e.: duplicate/more than one occurrence) in an array

arraysjavascript
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How to read a local text file?

javascriptxmlhttprequestfile-io
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Are variables declared with let or const hoisted?

javascriptecmascript-6letconstantshoisting
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Why can't I directly modify a component's state, really?

javascriptreactjs
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Wait until all jQuery Ajax requests are done?

javascriptajaxjquery
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