Language of mathematics contains a lot of domain specific constructs. Almost every part of mathematics has its own domain specific "extensions". So it's a good idea to borrow from there. In MPS we have a special base language extension that contains some mathematical notation. In this post we will consider one of such notations that we borrowed from mathematics. We quite often write code that checks whether a value lies in a specific range. This is especially widespread in a code working with graphics. We might write something like this: This piece of code checks whether a point lies insid

Many functional and dynamic languages have "tuples" in their syntax. Tuple is a sequence of a fixed length. For example, pair, triple and quadruple are tuples. They are very useful when you have algorithms operating on entities which have two, three or more parts and you don’t want to create devoted classes for them, or if you want to return multiple instances from a method. Let’s take a closer look at how tuples are implemented in MPS. We have a tuple type. Here is a pair of String and int: We have a special syntax for tuple construction: we added a new type of literal to the base languag