Quick and dirty Javascript repr() function using CoffeeScript

repr.coffee

repr = (o, depth=0, max=2) ->
  if depth > max
    '<..>'
  else
    switch typeof o
      when 'string' then "\"#{o.replace /"/g, '\\"'}\""
      when 'function' then 'function'
      when 'object'
        if o is null then 'null'
        if _.isArray o
          '[' + [''+repr(e, depth + 1, max) for e in o] + ']'
        else
          '{' + [''+k+':'+repr(o[k], depth + 1, max) for k in _.keys(o)] + '}'
      when 'undefined' then 'undefined'
      else o

NB: Requires Underscore.js

when 'string' then "\"#{o.replace /"/g, '\\"'}\""

Ah, nice one! Integrated.

showing \n and \r in strings would be nice.