Question

How to create a sorted unique list from a matrix in JavaScript

Answer 1

/*
    Create a sorted unique array (arr) from a matrix (arr of arr).
    Steps:
      1. Flatten matrix into arr
      2. Sort arr (Array.sort)
      3. Remove duplicates (Set)
*/

function makeSortedUniqueArr(mat) {
    // Flatten matrix into arr
    let arr = mat.flat();   

    // Sort arr
    arr.sort((a, b) => a - b);

    // Remove duplicates
    arr = [...new Set(arr)];

    return arr;
}

const mat = [
    [5, 1, 17, 3, 8, 2, 1, 9],
    [3, 5, 7, 4, 2, 3, 4, 1],
    [9, 1, 8, 2, 3, 88, 17, 5]
];

const arr = makeSortedUniqueArr(mat);

console.log(arr.join(" "));



/*
run:

1 2 3 4 5 7 8 9 17 88

*/

 

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