angularjs where filter

Update The latest release of angular adds a comparator argument to the filter filter, which can be used to achieve what the code below does (just pass true, see https://github.com/angular/angular.js/blob/master/src/ng/filter/filter.js#L35)

Often we need to filter objects by specific attributes. Angularjs comes with a limited filter filter, but we can write our own:

module.filter 'where', ->
  matchProperty = (obj, key, shouldEqual) ->
    value = obj[key]
    value = value.call(obj) if angular.isFunction(value)
    value == shouldEqual

  (input, properties) ->
    r = input.slice(0)
    for k, v of properties
      i = 0
      while i < r.length
        if matchProperty(r[i], k, v) then i++ else r.splice(i, 1)
      return r unless r.length
    r

Now we can filter:

li ng-repeat="l in locations | where:{type:'country'}"

http://plnkr.co/edit/cSgKGYCphZFLOgNnZHut?p=preview