This is an advance chapter of Learning Perl 6 by Randal L. Schwartz and brian d foy. It is incomplete and may contain merely notes or an outline for future work. It may also contain sections of their writing from other sources, although these are noted where possible.
This work is copyrighted under a contract between O'Reilly Media and the authors, and you cannot repost it or distribute it without permission.
Literal values are the things we type directly into our programs.
Inf NaN
~~ ===
Int Int|Str
print say
.fmt( '' );
base 2, 8, 10, 16
adverbs
:base
:base
\d42 \d[42] \o \x
\x[20, 32, 15] multiple characters
q//
qq//
Perl prefaces its variable names with sigils, or special character, to denote their type, but also to set them apart from everything else in the language. Since every variable name starts with a sigil, they will never conflict with a keyword, subroutine name, or other program element. That is, we do not have to know everything about the language to choose our variable names.
The rules for variable names (of all types, not just scalars) say that my indentifier (that's the name without the sigil) has to
strict mode on my default
scoping
0777 form out sigils invariant adverbs no more \177 or \0177 identifier names relaxed, no reserved names