Frage im Vorstellungsgespräch bei Bloomberg

Online coding assignment: --------------------------------- Find it here: https://imagebin.ca/v/2srEZRO0XbM0 Interview : ----------- Questions were asked from submitted assignment. -- what's the purpose of nonatomic? -- categories vs. extensions -- extending the code to support more functionality -- ARC -- what are other possible @property attributes apart from atomic/nonatomic & strong/weak?