Hands-On Design Patterns and Best Practices with Julia

Using the postwalk function

In order to traverse the whole abstract syntax tree, we can use the MacroTool's postwalk function. To understand how it works, we can play with a simple example, as outlined in the following steps:

1. Let's create an expression object as follows:

Here, we have used the rmlines function to remove the line number nodes since we do not need them in this exercise.

2. Then, we can use the postwalk function to traverse the tree and display everything that it has ever encountered:

The postwalk function accepts a function ...