ember.js - Ember Correct way to build computed property for an array or arrays -

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demonstration @ https://ember-twiddle.com/e32e95aef1619a9839b4

i'm trying build computed property depends on items within array or arrays. logically done array1.@each.array2.[] documentation clear not valid syntax , results in warning though works.

the warning , guide both tell me create interim computed property bridge gap, can't logically see how create property , not run exact same problem.


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