On 15.09.2007 19:13, John Joyce wrote:
>
> On Sep 15, 2007, at 1:51 AM, kendear wrote:
>
>> i wonder in Ruby, is there a line method to do something like in C
>>
>>
>> print_val("Array[3] + 1")
>>
>> and get the printout of
>>
>>
>> Array[3] + 1 is 3.345

def print_val(expr,b=binding)
print( expr, " is ", eval(expr,b).inspect, "\n")
end

irb(main):026:0> a=%{foo bar baz}
=> "foo bar baz"
irb(main):027:0> print_val "a[1]", binding
a[1] is 111
=> nil
irb(main):028:0> print_val "a[1]"
NameError: undefined local variable or method `a' for main:Object
from (irb):21:in `print_val'
from (irb):21:in `print_val'
from (irb):28
from :0

You can even omit the "b" argument if you use something like
"Binding.of_caller".

Kind regards

robert