What is the best way to establish default values for an array containing an undetermined amount of objects?

Understanding how to set default values for an object is pretty straightforward:

store.currentUser = {
  username: ''
}

And updating these values can be done like so:

store.getCurrentUser = () => {
  const currentUser = Parse.User.current()
    store.currentUser.username = currentUser.username
  }
}

However, when dealing with an array, things get a bit more complex:

store.buildings = [
  // how can we set defaults here?
]

Especially since the number of objects in the array is dynamic:

store.findBuildings = () => {
  const query = new Parse.Query(Building)
  return query.find({
    success: (buildings) => {
      // _.map(buildings, (building) => building.toJSON())
      // -> [ {name: 'Name 1'}, {name: 'Name 2'}, etc... ]
      // How do we update store.buildings with the new values?
    },
    error: (buildings, error) => {
      console.log('Error:', error.message)
    }
  })
}

Is there a way to tackle this issue?

Please Note: Simply setting buildings = [] won't work because having default keys is essential for my app's reactivity.

Answer №1

Take a look at this helpful response

Array.prototype.repeat= function(what, L){
 while(L) this[--L]= what;
 return this;
}

var A= [].repeat(0, 24);

Or you can also consider the alternative approach:

var a = Array.apply(null, Array(24)).map(function() { return /your object here/ });
// or:
var a = Array.apply(null, Array(5)).map(Boolean).map(Number);

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