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function inherit(target, origin){  function F() {};  F.prototype = origin.prototype;  let f = new F();  target.prototype = f;  target.prototype.constructor = target;}

function missingNumber(nums){  nums.sort((a,b) => a-b);  let len = nums.length;  let arr = [];  for(let i = 0; i <= len; i++){    arr[i] = i;  }  arr = arr.filter(el => !nums.includes(el))  return arr[0];}let nums = [9,6,4,2,3,5,7,0,1];

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