Currently trendy? https://en.wikipedia.org/wiki/Design_Patterns#Introduction.2C_Chapter_1 https://en.wikipedia.org/wiki/Design_Patterns#Introduction.2... I wo

Currently trendy? https://en.wikipedia.org/wiki/Design_Patterns#Introduction.2C_Chapter_1 https://en.wikipedia.org/wiki/Design_Patterns#Introduction.2... I wouldn't consider 1995 current. And it's gone way beyond "trendy". EDIT: Also, what you've mentioned there is not composition - it is objects that have other objects as properties. Composition basically involves wrapping and forwarding, whether it's function or object composition.