git ssb

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var MutantLookup = require('./lookup')
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var MutantDict = require('./dict')
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var DictToCollection = require('./dict-to-collection')
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module.exports = MutantMappedDict
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function MutantMappedDict (defaultItems, lambda, opts) {
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  opts = opts || {}
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  var list = MutantDict(defaultItems, {
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    comparer: opts.comparer
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  })
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  var observable = MutantLookup(DictToCollection(list), function (item, invalidateOn) {
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    var value = lambda(item.key, item.value, invalidateOn)
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    if (value[0] === item.key && value[1] === item.value) {
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      return item // passthru
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    } else {
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      return value
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    }
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  }, opts)
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  observable.set = list.set
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  observable.put = function (key, item) {
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    list.put(key, item)
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    return observable.get(key)
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  }
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  observable.delete = function (key) {
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    list.remove(key)
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  }
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  return observable
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}
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