[samatman]

One will quickly become accustomed to the .{} pattern learning Zig. It's used for struct constructors:

  const a_struct: StructType = .{ .foo = "baz"}; 

As well as union initialization. So .{} is a struct constructor for a struct where every field has a default value, which chooses all of those fields.

[flohofwoe]

I think it becomes clearer when considering that these are all equivalent:

    const a_struct: StructType = StructType{ .foo = "baz" };

    const a_struct = StructType{ .foo = "baz" };

    const a_struct: StructType = .{ .foo = "baz" };