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try {
  oObj.uAddProperty(nMask,sKey,vVal_fGet,fSet);
} catch(e) {
  // likely a TypeError if an existing non-configurable property of the same sKey is defined
}

obj.addProp(mask, key, val_get, set);

playerData.primaryTarget = null;
for (var p=0; p<playerData.length; p++) {
  // Add a hidden and read-only .id property that returns the player number
  playerData[p].uAddProperty(
    DATA_READONLY_HIDDEN,
    "id",
    p
  );
  // Add a read-only .isAlly property that returns true if this player is an ally
  // Note: No setter function (fSet) means read only
  playerData[p].uAddProperty(
    ACCESSOR_NORMAL,
    "isAlly",
    allianceExistsBetween.uCurry(me,p)
  );
  // Add a read-only .isMe property that returns true if this player is me
  playerData[p].uAddProperty(
    ACCESSOR_NORMAL,
    "isMe",
    function() {
      return (this.id==me);
    }
  );
  // Add a read-only .isEnemy property that returns true if this player is an enemy
  playerData[p].uAddProperty(
    ACCESSOR_NORMAL,
    "isEnemy",
    function() {
      return (!(this.isAlly || this.isMe));
    }
  );
  // Add a read-write .isPrimaryTarget boolean property
  playerData[p].uAddProperty(
    ACCESSOR_NORMAL,
    "isPrimaryTarget",
    function() {
      return (playerData.primaryTarget == this.id);
    },
    function(bool) {
      playerData.primaryTarget = (!!bool) ? this.id : null;
      return (!!bool);
    }
  );
}// See https://warzone.atlassian.net/wiki/display/EGG/Function+Manipulation
// For info on curry() and wraps()
 
var isAlly = allianceExistsBetween.curry(me);
 
var NOT = funciton(bool) {
	return !bool;
}
 
var isEnemy = NOT.wraps(isAlly);

// Iterate the playerData array and add properties to objects
 
playerData.forEach(function(player, id) {
	// using .addAccessor() would be more concise
	playerData[id].addProp(
		ACCESSOR_HIDDEN,
		"isAlly",
		isAlly.curry(id)
	);
	playerData[id].addProp(
		ACCESSOR_HIDDEN,
		"isEnemy",
		isEnemy.curry(id)
	);
	// using .addConst() would be more concise
	playerData[id].addProp(
		DATA_HIDDEN_READONLY,
		"isMe",
		(id == me)
	);
});
 
playerData[somePlayer].isAlly; // true or false
// etc...