Function randstr

js/src/widget.ts:2017–2059

(
  existing?: { [k: string]: any },
  bits?: number,
  base?: number,
  _recursion?: number
)

}

function randstr(
  existing?: { [k: string]: any },
  bits?: number,
  base?: number,
  _recursion?: number
): string {
  if (!base) base = 16;
  if (bits === undefined) bits = 24;
  if (bits <= 0) return "0";

  var digits = Math.log(Math.pow(2, bits)) / Math.log(base);
  var res = "";
  var i, b, x;

  for (i = 2; digits === Infinity; i *= 2) {
    digits = (Math.log(Math.pow(2, bits / i)) / Math.log(base)) * i;
  }

  var rem = digits - Math.floor(digits);

  for (i = 0; i < Math.floor(digits); i++) {
    x = Math.floor(Math.random() * base).toString(base);
    res = x + res;
  }

  if (rem) {
    b = Math.pow(base, rem);
    x = Math.floor(Math.random() * b).toString(base);
    res = x + res;
  }

  var parsed = parseInt(res, base);
  if (
    (existing && existing[res]) ||
    (parsed !== Infinity && parsed >= Math.pow(2, bits))
  ) {
    if (_recursion > 10) {
      console.warn("randstr failed uniqueness");
      return res;
    }
    return randstr(existing, bits, base, (_recursion || 0) + 1);
  } else return res;
}

export default () => {
  let model;