Check if there is a missing item in an object

Updated: January 20, 2021

Given an object, we want to check if there is any missing item in it:

var footballTeam = {
  goalkeepers: {
    url: "string",
    updatedAt: new Date(),
    createdAt: new Date(),
  },
  defenders: {
    url: "string",
    updatedAt: new Date(),
    createdAt: new Date(),
  },
  midfielders: {
    url: "string",
    updatedAt: new Date(),
    createdAt: new Date(),
  },
  attackers: {
    url: "string",
    updatedAt: new Date(),
    createdAt: new Date(),
  },
};

var positions = ["goalkeepers", "defenders", "midfielders", "attackers"];

var isAnyPositionMissing = positions.some(
  (position) => !footballTeam[position]
);

if (isAnyPositionMissing) {
  console.log("at least one position is missing");
} else {
  console.log("it's all good");
}