From: Gavin Sinclair <gsinclair@...>
Date: 2004-04-03T10:47:33+09:00
Subject: Re: Variable names

On Saturday, April 3, 2004, 2:20:24 AM, David wrote:

> So, say we have a method print_line that takes two parameters (1) an
> integer line number and (2) a string which is the line.

> def print_line(lineNo, line)
>      lineNo.should_be(Integer, :lineNo)
>      line.should_be(String, :line)
>      # by now, we would have thrown a TypeError if lineNo
>      # and line are not an Integer and a String respectively
>      [...]


Since what you want doesn't (to me) intuitively exist, I suggest
rewriting it as:

  def print_line(lineNo, line)
    should_be(Integer, :lineNo)
    should_be(String, :line)
    ...


  def evaluate_local_variable(var)
    if local_variables.include? var
      eval var
    else
      raise ArgumentError, "You didn't give me a local variable: #{var}"
    end
  end


You can probably improve on that, and write it in C, but you get the
idea.

Cheers,
Gavin