languages

types of patterns

creational, structural, behavioral

examples of creational patterns

factory function, builder, singleton

examples of structural patterns

adapter

examples of behavioral patterns

iterator

singleton (“factory function”

can return instances of different classes in different cases. EX: return new PolarPoint (x,y) instead of having to create a new object

cons of constructors

they have no name, multiple methods with the same name

overloading

multiple methods with the same name. distinguished by parameters

builder creational pattern

helps us create other objects, like a string builder bit by bit. good pairing: mutable Builder for an immutable type

adapter structural pattern

allows you to use instances from other classes to make 2 interfaces compatible

iterator design pattern

enumerate a collection while hiding data structure details