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

// 

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...