Metaprogramming is a concept where by a language can express its own code as a data structure of itself. For example, Lisp expresses code in the form of Lisp arrays, which are data structures in Lisp itself. Similarly, even Julia can express its code as data structures.
This makes it possible for Julia to generate and transform code through a Julia program. Julia has really nice reflection properties. So, the property of metaprogramming makes it easy to handle repetitive programming and function execution in data science and, especially, while handling big data in the Map Reduce framework.
