get random performance

gistfile1.txt

function getRandoms() {
  const examples = 100;
  for (var i = 0; i < examples; i++) {
    const arr = Array(getRandomInt(1, 6)).fill(null);
    for (var j = 0; j < arr.length; j++) {
      arr[j] = getRandomInt(-50, 150);
    }
    console.log(`[${arr.map(a => a + '%').join(', ')}] => `, perf(arr).toFixed(2) + '%');
  }
}

function perf(arr) {
var x = Math.sqrt(arr.slice(1).reduce(
(acc, perf) => {
  return acc * (1 + perf / 100)
},
1 + arr[0] / 100
));
return 1000 * (x / (1 + x) - 0.5);
}

function getRandomInt(min, max) {
    min = Math.ceil(min);
    max = Math.floor(max);
    return Math.floor(Math.random() * (max - min + 1)) + min;
}