Raku Books / Creating a Compiler in Raku / Functions
Built-in functions
Throughout the book, we were using the say function,
that is a perfect example of a built-in function. In this section, we’ll
implement three more functions: print, len,
and keys. Of course, you may extend the list with your own
interesting functions later.
Allow the new keyword in the grammar:
token function-name {
'say' | 'print' | 'len' | 'keys'
}