Question

How to flatten a 2D array into a sorted one-dimensional array with unique values in JavaScript

Answer 1

const arr2d = [ 
    [ 5, 6, 1, 1, 1 ], 
    [ 3, 8, 0, 2, 2 ],
    [ 9, 2, 7, 3, 3 ] 
];
 
let arr = arr2d.flat();
arr.sort(); 

arr = [...new Set(arr)];
 
arr.forEach(n => {
    process.stdout.write(n + "\t");
});
 
  
   
/*
run
  
0	1	2	3	5	6	7	8	9		
   
*/

 

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