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rawpatchinlineside by side (parent: 5695c5d)
rawpatchinlineside by side (parent: 5695c5d)
| author | Nobuyoshi Nakada <[email protected]> | |
| Sun, 12 May 2024 07:23:00 +0000 (12 16:23 +0900) | ||
| committer | Nobuyoshi Nakada <[email protected]> | |
| Sun, 12 May 2024 07:23:00 +0000 (12 16:23 +0900) |
Guard clauses can only be used in `case` pattern matching statements,
not in `=>`/`in` operators.
not in `=>`/`in` operators.
| doc/syntax/pattern_matching.rdoc | patchblobblamehistory |
== Guard clauses
-+if+ can be used to attach an additional condition (guard clause) when the pattern matches. This condition may use bound variables:
++if+ can be used to attach an additional condition (guard clause) when the pattern matches in +case+/+in+ expressions.
+This condition may use bound variables:
case [1, 2]
in a, b if b == a*2
end
#=> "matched"
+Note that <code>=></code> and +in+ operator can not have a guard clause.
+The following examples is parsed as a standalone expression with modifier +if+.
+
+ [1, 2] in a, b if b == a*2
+
== Appendix A. Pattern syntax
Approximate syntax is: