text: Check duplicates in a stream of strings | Function to insert the names and check whether they appear for the first time ; To store the names of the employees ; If current name is appearing for the first time ; Driver code
code: function insertNames ( arr , n ) { let set = new Set ( ) ; for ( let i = 0 ; i < n ; i ++ ) { if ( ! set . has ( arr [ i ] ) ) { document . write ( " " + " " ) ; set . add ( arr [ i ] ) ; } else { document . write ( " " + " " ) ; } } } let arr = [ " " , " " , " " ] ; let n = arr . length ; insertNames ( arr , n ) ;