export const randomSelectNoRepeat = (
  arr: string[] | any[],
  count: number,
  mapper?: (obj: any) => any
) => {
  if(arr.length < count) return arr;
  const length = arr.length;
  let availableNum = 0;
  let lottery = {} as any;
  while (availableNum < count) {
    let code = Math.random() * length;
    if (code === length) code -= 1;
    code = Math.floor(code);
    if (lottery[code]) continue;
    lottery[code] = mapper
      ? mapper(arr[code])
      : typeof arr[code] === "string"
      ? arr[code]
      : {
          ...arr[code],
        };
    availableNum++;
  }
  return Object.values(lottery) as any[];
};

export const randomSelect = (arr: any[], noReturn = 0) => {
  if (Math.random() < noReturn) return undefined;
  const length = arr.length;
  let code = Math.random() * length;
  if (code === length) code -= 1;
  return arr[code];
};