The most notable features of this new release are:

• Major syntax changes
• Immutability by default
• Tuples
• Checked subscript
• Performance improvements

Windows support is almost there and will probably be shipped in a minor release in the coming weeks.

Here is the full changelog

Major syntax changes

• Types are now specified after the identifier + : (https://github.com/buzz-language/buzz/issues/310). This includes:
  • Variable declarations
  • Function argument definitions
  • Catch clauses
  • if (...: type as ...)
• Arrow function use => instead of ->
• Comments and docblocks must now be prefixed by // and /// instead of | and ||
• Bitwise or operator is | instead of \
• Function type now use fun keyword instead of Function
• If a function type has multiple error types, they must be put in parenthesis
• Namespace can now be multiple \ separated identifiers
• Qualified name now use \ separator instead of .
• The float type is renamed to double (https://github.com/buzz-language/buzz/issues/311)
• Enum type is declared between <> rather than ()
• Protocol list object is conforming to is declared between <> rather than ()
• const keyword is renamed to final (https://github.com/buzz-language/buzz/issues/318)

Added

• Immutability by default (https://github.com/buzz-language/buzz/issues/139)
  • All non-scalar values are immutable by default
  • Mutability can be specified in types and for values with the mut keyword
  • Object methods that mutate this must be prefixed by mut
  • FFI data are considered mutable
• Compiler will warn about variable declared with var but never assigned
• Object can have final properties (https://github.com/buzz-language/buzz/issues/13)
• rg.subsetOf, rg.intersect, rg.union
• Tuples (https://github.com/buzz-language/buzz/issues/298): syntaxic sugar over anonymous objects:

const tuple = .{ "john", "james" };

tuple.@"0" == "john";

• Checked subscript access to list and strings (gives null when index is out of bound) (https://github.com/buzz-language/buzz/issues/304):

var list = [1, 2, 3];

list[?10] == null;

"hello"[?20] == null;

• User input is syntax highlighted in REPL (https://github.com/buzz-language/buzz/issues/217)
• REPL handles multilines input (https://github.com/buzz-language/buzz/issues/218)
• std\args(): returns the command line arguments with which the script was launched
• Compiler is better at inferring empty list/map type from their context (https://github.com/buzz-language/buzz/issues/86)

Modified

• Enum can now have rg, ud, void, pat as value type
• Anonymous object can also omit property name when initial value is a named variable
• Mir was updated to 1.0 (https://github.com/buzz-language/buzz/issues/300)

Fixed

• Type checking was not done on object instance property assignments
• Http client could not be collected because it kept connection opened to previous requests' domains
• Fixed an issue where a JIT compiled function making a lot of function calls would stack overflow

Internal

• Properties are now retrieved with an index rather than a hashmap lookup (https://github.com/buzz-language/buzz/issues/90) which gives a nice performance boost of about 40% on some benches