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Idiom #176 Hex string to byte array

From hex string s of 2n digits, build the equivalent array a of n bytes.
Each pair of hexadecimal characters (16 possible values per digit) is decoded into one byte (256 possible values).

a = bytearray.fromhex(s)
import "encoding/hex"
a, err := hex.DecodeString(s)
if err != nil {
	log.Fatal(err)
}
const base = 16
let a = s
  .replace(/../g, '$&_')
  .slice (0, -1)
  .split ('_')
  .map (
    (x) => parseInt (x, 16)
  )
sysutils
for i := 0 to length(s) div 2 - 1 do
  a[i] := StrToInt('$'+Copy(s,2*(i)+1,2));

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