String interpolation method?

ruby-talk
1

=> require 'facets/string/interpolate'

Hmm....

Very neat in application....

String.interpolate{a}

but....

     def interpolate(&str)
       eval "%{#{str.call}}", str.binding
     end

...equally nasty in implementation.

Ah well, clearly then I wasn't missing something.... there is no
standard method.

Thanks,

John Carter Phone : (64)(3) 358 6639
Tait Electronics Fax : (64)(3) 359 4632
PO Box 1645 Christchurch Email : john.carter@tait.co.nz
New Zealand

···

On Thu, 28 Feb 2008, Trans wrote:

2

Not that it is a lot nicer, but just another solution... and a little bit on side of what you wanted, but:

>> a = lambda{|c| "bra#{c}ket"}
>> a.call(" see ")
=> "bra see ket"

:slight_smile:

···

On Feb 28, 2008, at 12:42 AM, John Carter wrote:

On Thu, 28 Feb 2008, Trans wrote:

=> require 'facets/string/interpolate'

Hmm....

Very neat in application....

String.interpolate{a}

but....

  def interpolate(&str)
    eval "%{#{str.call}}", str.binding
  end

...equally nasty in implementation.

Ah well, clearly then I wasn't missing something.... there is no
standard method.

Thanks,

John Carter Phone : (64)(3) 358 6639
Tait Electronics F

3

If you want it to look even nicer, write it like:
  >> a = lambda{|c| "bra#{c}ket"}
  >> a[" see "]
  => "bra see ket"

-Rob

···

On Feb 29, 2008, at 7:21 AM, Guby wrote:

Not that it is a lot nicer, but just another solution... and a little bit on side of what you wanted, but:

>> a = lambda{|c| "bra#{c}ket"}
>> a.call(" see ")
=> "bra see ket"

:slight_smile:

On Feb 28, 2008, at 12:42 AM, John Carter wrote:

On Thu, 28 Feb 2008, Trans wrote:

=> require 'facets/string/interpolate'

Hmm....

Very neat in application....

String.interpolate{a}

but....

def interpolate(&str)
   eval "%{#{str.call}}", str.binding
end

...equally nasty in implementation.

Ah well, clearly then I wasn't missing something.... there is no
standard method.

Thanks,

John Carter Phone : (64)(3) 358 6639
Tait Electronics F

Rob Biedenharn http://agileconsultingllc.com
Rob@AgileConsultingLLC.com

4

Sweet, that looks better!
Good to learn something new! :slight_smile:

S

···

On Feb 29, 2008, at 11:07 AM, Rob Biedenharn wrote:

If you want it to look even nicer, write it like:
>> a = lambda{|c| "bra#{c}ket"}
>> a[" see "]
=> "bra see ket"

-Rob

On Feb 29, 2008, at 7:21 AM, Guby wrote:

Not that it is a lot nicer, but just another solution... and a little bit on side of what you wanted, but:

>> a = lambda{|c| "bra#{c}ket"}
>> a.call(" see ")
=> "bra see ket"

:slight_smile:

On Feb 28, 2008, at 12:42 AM, John Carter wrote:

On Thu, 28 Feb 2008, Trans wrote:

=> require 'facets/string/interpolate'

Hmm....

Very neat in application....

String.interpolate{a}

but....

def interpolate(&str)
  eval "%{#{str.call}}", str.binding
end

...equally nasty in implementation.

Ah well, clearly then I wasn't missing something.... there is no
standard method.

Thanks,

John Carter Phone : (64)(3) 358 6639
Tait Electronics F

Rob Biedenharn http://agileconsultingllc.com
Rob@AgileConsultingLLC.com

5

The only trouble here is that you get the binding of where you defined
the lambda, rather than the one in which you ultimately evaluate it
in.

With 1.9 I think we can use instance_exec to handle that however --
that being the case, the String::interpolate method I demoed above
could be improved.

T.

···

On Feb 29, 9:07 am, Rob Biedenharn <R...@AgileConsultingLLC.com> wrote:

If you want it to look even nicer, write it like:
  >> a = lambda{|c| "bra#{c}ket"}
  >> a[" see "]
  => "bra see ket"