FCC所有都为真

function every(collection, pre) {
  // Is everyone being true?
  function juge(n){
     if(n)return true;
    else return false;
  }
  var newarr=[];
  collection.forEach(val=>newarr.push(val[pre]))
  return newarr.every(juge);
     }

every([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex");