How to quickly get the first, or last element of an array in Nim?

[mareklachbc]

Some equivalent of a simple example like this?
    
    
    
    last [a, b] would return ``b``
    first (_, +,+, x)  would return `` _ ``
    
    
    
    Run

I assume `seq` would most likely be involved in achieving this, but how ?

Thanks,