const things = {

    'a':{msg:'ok1'},

    'b':{msg:'killme'},

    'c':{msg:'ok2'},

  };

  const toKill = [];

  print(JSON.stringify(things));

  for(const key in things) {

    const thing = things[key];

    if(thing.msg === 'killme') {

       toKill.push(key);

    }

  }

  toKill.forEach((x)=>delete(things[x]));

  print(JSON.stringify(things));

  let otherthings = [

    {msg:'ok1'},{msg:'killme'},{msg:'ok2'}

  ];

  print(JSON.stringify(otherthings));

  otherthings = otherthings.filter((thing)=> (thing.msg !== 'killme') );

  print(JSON.stringify(otherthings));

}