[Jprogramming] literal format

[David Lambert]

In simplest form, python string formatting replaces {} with the next 
`stringified' argument.  It's a good idea!  This simple form has met 
almost all my requirements.  I've never needed the optional positional 
specifiers, and sometimes used the specific formatting instructions that 
can fit within the braces.  Here's a version:

    NB. an implementation
    format=: ''&$: :([: ; (a: , [: ":&.> [) ,. '{}' ([ (E. <@}.;._1 ]) ,) ])

    NB. examples
    1 2 3 format 'A {} and a {} set go {}'
A 1 and a 2 set go 3

    (;:'Marcia John') format 0 :0
Dear {},
    I miss your kiss.
fondly,
{}
)
Dear Marcia,
    I miss your kiss.
fondly,
John

The first of these references uses pre-formatted numbers, the latter 
task provided reason to create it.

http://rosettacode.org/wiki/Exponentiation_with_infix_operators_in_(or_operating_on)_the_base#J
http://rosettacode.org/wiki/Cistercian_numerals#J