8x8 Matrix with 10 1s on random positions

gist.js

function shuffle(a) {
  for (let i = a.length; i; i--) {
    let j = Math.floor(Math.random() * i);
    [a[i - 1], a[j]] = [a[j], a[i - 1]];
  }
  return a;
}

function range(n) {
  return new Array(n).fill(0).map((_, i) => i);
}

function chunk(arr, n = 8) {
  return arr.reduce((arrs, x, i) => {
    if (i % n === 0) {
      arrs.push([])
    }
    const last = arrs[arrs.length - 1];
    last.push(x)
    return arrs;
  }, [])
}


chunk(shuffle([...range(54).map(_ => 0), ...range(10).map(_ => 1)]))