Introduction to TypesScript

Introducing TypeScript

In programming, the type of some data indicates the set of values that are valid for that data. For example, if I say that a value is an integer, that means I expect the data to have a value like 1, -3, or 357 and not a value like "banana". If the data is set to a value that is not of the expected type, we expect something bad to happen. In some languages, the attempt to set data to the wrong value leads to a compiler error. Whereas in other languages, it leads to incorrect or unspecified behavior at runtime.

All high-level programming languages use some concept of type to determine behavior. This is to say that all these languages determine behavior by using not just the value of a piece of data in the system but also information about what kind of value it is.