Ruby 3.1
Ruby now has “punning.”<p>> Values in Hash literals and keyword arguments can be omitted. [Feature #14579]<p>> {x:, y:} is a syntax sugar of {x: x, y: y}.<p>> foo(x:, y:) is a syntax sugar of foo(x: x, y: y).<p>This is going to be controversial and take some getting used to, but I think eventually everyone will love it. It’s not an easy syntax to learn - I remember when this came to JS it took a while to get my head around all the different ways this shorthand was used in the wild.<p>It’s hard to come up with new syntax that can peacefully coexist with the established language. I think in hindsight it would have been helpful for Ruby if it had done something like square braces instead of brackets for hash literals, or not allowed brackets for blocks. The most ambiguous syntax all involves hash literals vs blocks… this adds to that cognitive load.<p>But typing out a long hash literal just to capture a bunch of local variables or methods is so common, and the duplication is quite annoying, so on the whole I’m glad this was added and am sure I’ll use it a lot :)