String interpolation

- String interpolation. Let's spend just a moment understanding string interpolation. That might seem very simple, but it can mess us up sometimes with format string attacks. What is string interpolation? Well, we're just substituting variables in a string. We have some value that's going to go into the string. In Kotlin, we use the $ character to interpolate a variable, meaning we substitute something specific, and we can also have $, and then curly braces, to interpolate an expression. And you can include various types of formatting while you're interpolating. And here's an example. I have two constants, I have the name Moo, and the age 25. Now, Kotlin, of course, is going to automatically understand that this is a string and this is an integer. I can then just print. And then, within this print statement, I have $, this variable, name, is, and then $, this variable, age, years old. And then I have another variable called msg, for message, and it's just a simple string, "Today is…