Generate new random values and store in an array

Question

I am trying to generate two random values and store them in an array however I would like them to be different values each time a random number between 0-3 is generated.

function new_Randomvalues(n) {
    var array1 = [];
    for (var i = 0; i < n; i++) {
        var row = Math.round(3*Math.random());
        var col = Math.round(3*Math.random());
        array1.push([row,col]);
    }
    return array1;
}
console.log(new_Randomvalues(10));

How do I edit this function where if an array of same numbers are pushed into array1 then remove those and generate 10 unique coordinates. Help would be appreciated thanks

What's the problem? Each time you invoke this function, new random numbers are returned. — Orius, Feb 18 '22 at 15:44
So you want the output array to only contain _unique_ combinations? — evolutionxbox, Feb 18 '22 at 15:46
@Orius Yes but I want them to be different numbers such as if the function generates [0,0] then there shouldn't be another [0,0] and they should all be unique. Hope that clears up — sam, Feb 18 '22 at 15:47
Yes it is a 4x4 sudoku program and the values must not exceed 16 — sam, Feb 18 '22 at 15:48
You can generate all possible pairs, put them in an array, shuffle it, and choose the first 10 entries. Would that work for you? — Orius, Feb 18 '22 at 15:51
https://stackoverflow.com/questions/2450954/how-to-randomize-shuffle-a-javascript-array — James, Feb 18 '22 at 15:53
@sam See my answer (not the best use of the answer mechanism, but what can you do...) — Orius, Feb 18 '22 at 16:00
@Orius I will give it a try. It seems to be working when I run it here. Thank you for much — sam, Feb 18 '22 at 16:03

score 2 · Accepted Answer · answered Feb 18 '22 at 15:59

Per sam's question in the comments, here's the code:

function shuffle(array) {
    for (var i = array.length - 1; i > 0; i--) {
        var j = Math.floor(Math.random() * (i + 1));
        var temp = array[i];
        array[i] = array[j];
        array[j] = temp;
    }
}

pairs = [];

for (let i = 0; i <= 3; i++) {
    for (let j = 0; j <= 3; j++) {
        pairs.push([i, j]);
    }
}

shuffle(pairs);

pairs = pairs.slice(0, 10);

console.log(pairs);

Generate new random values and store in an array

1 Answers1