@cdunn2001: For what (I guess) you are trying to achieve, I would go for
something like:
import tables
proc complementsFrom(normal, complement: string): Table[char,char] =
result = initTable[char,char]()
for ix, ch in normal:
result[ch] = complement[ix]
proc reverseComplement(str: string): string =
const complements = complementsFrom("ACGTacgtNn-", "TGCAtgcaNn-")
result = newString(str.len)
for ix, ch in str:
result[str.high - ix] = complements[ch]
echo reverseComplement("Gattaca")
**nim** has the nice feature that **const** are evaluated at compile time. So,
const complements = complementsFrom("ACGTacgtNn-", "TGCAtgcaNn-")
will only be evaluated at compile time.
