block helper to check if arguments is equal

equalHelper.coffee

`import Em from 'ember'`

equal = (args..., options) ->
  arr = for arg in args
    value = @get(arg)
    if typeof value isnt 'undefined' then value else arg

  method = if _.isEqual.apply(_, arr) then 'fn' else 'inverse'
  return options[method](@)

EqualHelper = Em.Handlebars.registerHelper 'equal', equal

`export { equal }`

`export default EqualHelper`