crystal

We love the crystal programming language. It's only / main shortcomings are:

• Type inference is slow

• missing uniform serialization resulting in

• lack of caching:

• changing a line of code often results in the whole compilation of the project

• this makes compilation often very time consuming aka slow

• missing WASM target

• ugly operators && || for and, or

• data is second class citizen

minor issues:

• verbose hash maps {1 => 2, 3 => 4} vs {1:2 3:4}
• next = break
• the block mechanism is cumbersome:

def twice(&block)
  yield
  yield
end

best features of crystal:

• clear syntax, yet compiled
• if after blocks: a = 2 if some_condition
• operator overloading
• block of code is executed with the yield keyword

Interesting:

• very clear statements of language goals
• The difference between using do ... end and { ... } is that do ... end binds to the left-most call, while * { ... } binds to the right-most call
• It like operator &.
• method &.some_method
• with ... yield
• a non-captured block is always inlined

https://github.com/pannous/cheats/edit/master/cheats.crystal