Created
September 26, 2017 23:09
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Compiled time array
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| A = [] of Nil | |
| {% A << 0 %} | |
| {% A << "Some String" %} | |
| {% p A[0] %} # => 0 | |
| {% p A[1] %} # => "Some String" |
When you don't use a constant it's not typed, so a constant can be used as a placeholder in macros
That is, when you don't use that constant at runtime
Also known has hack #123 (just kidding)
But Elixir does something similar, only with attributes (which only exist at compile-time, I think)
https://gitter.im/crystal-lang/crystal?at=59cac1267b7d98d30d3d2033
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https://carc.in/#/r/2sv6