Perl 6
WITCH lboxy: Revision 8

Mnemonics

"array", "box", "square"

  • main use is for arrays
  • also used in meta operators
  • it generates "square" things (as in fuddy, old-fashioned, plain, vanilla)

Used as a brace pair or quote pair

Operators containing this character

When used inside regexes

As an Adverb

  • [] after an adverb can assign an Array object to an adverb but note that...
  • [] before an adverb is probably being used to specify a type of key for .k or .kv
  • : [] as an "adverb" on an identifier is used for extended identifiers when interpolation is desired.

Hyper operator and meta operator restrictions

When used as the reduce meta-operator, only certain reduce operations have identity, others require multiple elements.

Old, deprecated, or other language uses

  • [] is no longer a regular expression character set as in perl5. That is now <[]>
  • [^] is no longer an inverted regex character set as in perl5. That is now <-> and <!>

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