Caseless object set/get/has, very useful when working with HTTP headers.
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README.md

Caseless -- wrap an object to set and get property with caseless semantics but also preserve caseing.

This library is incredibly useful when working with HTTP headers. It allows you to get/set/check/delete headers in a caseless manner while also preserving the headers' case when they are first set.

Usage

var headers = {}
  , c = caseless(headers)
  ;
c.set('a-Header', 'asdf')
c.get('a-header') === 'asdf'

has(key)

Has takes a name and if it finds a matching header will return that header name with the preserved caseing it was set with.

c.has('a-header') === 'a-Header'

set(key, value[, clobber=true])

Set is fairly straight forward except that if the header exists and clobber is disabled it will add ','+value to the existing header.

c.set('a-Header', 'fdas')
c.set('a-HEADER', 'more', false)
c.get('a-header') === 'fdsa,more'

swap(key)

Swaps the casing of a header with the new one that is passed in.

var headers = {}
  , c = caseless(headers)
  ;
c.set('a-Header', 'fdas')
c.swap('a-HEADER')
c.has('a-header') === 'a-HEADER'
headers === {'a-HEADER': 'fdas'}

del(key)

Deletes a key and, if there's many instances of the key with multiple cases, all of them.

var headers = {
  'a-Header': true,
  'content-length': 312,
  'Content-Length': 312
}
var c = caseless(headers);

c.del('Content-length');
headers === {
  'a-Header': true
};