Variables Gallery Walk

This semester I started to teach a new programming language, Swift.  Students seem to be able to create a basic app at the beginning of the semester, but I was worried that they didn't truly understand the fundamentals of variable creation.  To help students communicate and talk about variables, I had them break up into small groups and create a poster for their variable type (integers, doubles, boolean, String, how to check if two variables are equal, etc).  Each poster contained a description of the variable type and what this would look like with code.  The student then hung up their posters and the class participated in a gallery walk.   Many of my students decided to take pictures of these posters to keep as notes to use as a reference when they completed their next programming assignment.