v0.21.0

Updates from v0.20.1

• Updated
  • Obsoleted a dot style of string literal like .abc which means "abc".
    • This is changed to another feature.
    • Newly .abc is a function object which means { => _1.abc.isFunction ? _1.abc() : _1.abc }.
    • And also .is*** like .isFunction to check a type is a function object which means { => _1.is*** }.
    • This feature will care for the purpose below.
      • As a call back method for methods of Array such as Array#map, Array#filter, and so on.
      • As a function object placed at a when clause in case-when.
  • Updated case-when features.
    • Supported ^ as a pin operator.
    • Supported an lvalue of array with index at when condition.
    • Supported | operator for multiple conditions called as alternative pattern at when condition.
    • Supported putting a function object to check the result by function call at when condition.
    • Changed to make it error when the length of array is mismatched.
    • _ means to ignore binding a value at when condition.
  • Introduced a when label in switch statement.
    • This can be used a substitute of a case label, and it will do break automatically by default.
    • When specifying fallthrough; at the last statement of a when clause, it will be fallthrough.
    • The label instead of default: is else: which will do break automatically at the end of statements.
    • The fallthrough keyword in a case is meaningless and it will be ignored.
    • You can mix a case label and a when label, but it is not recommended.
    • switch-when is a statement and it is same as switch-case except a behavior of break and fallthrough.
  • Updated some type system.
    • For type check in a language server.
    • Making a compile error when it is unknown type or type mismatch in assignment.
  • I am very sorry but, after a reconsideration I desided to change a syntax for a return type of native again.
    Instead, It was possible to add a syntax that you can specify a return type also for a normal function.
    However note that a return type for a normal function is currently just an information to the language server.
    • OLD
      • native:int
    • NEW/ADD
      • native funcname(args):int
      • function funcname(args):int
      • public funcname(args):int
      • private funcname(args):int
  • Some bug fixes and improvements.