[yellowapple]

> unlike Python that only has built-in control structures, here any function can look like if/for/while if it takes a lambda body

That's absolutely fantastic. I've had to do a lot more Python programming for work, and I've been thoroughly disappointed by Python's lack of support for custom blocks/structures like that (contrast with Ruby or Elixir, where any function can take a do ... end, or with Tcl where "blocks" are just strings).