Function cadnr

  • Extracts the operand at the specified zero-based position, where expr = (op0 op1 op2 ...). cad(n)r foo = cad(n-1)r cdr foo and cad(0)r foo = car foo

    Parameters

    • expr: Cons

      A Cons expression for which the nth operand is sought.

    • n: number

      The zero-base operand index. MUST be an integer >= 0.

    Returns U