@ZeHiro

• is operationsId supposed to be sorted by date?
• where would the selectIfUnchangedOperationList / selectFilteredOperations / selectOnlyIfUnchangeFilteredOperations be used?
• i don't understand the update filter function so that block of code. Can you explain it further?
• join('') might not work when elements of the array are objects. Even with an id array, the following two are considered the same with your algorithm: [1, 2, 34] and [1, 23, 4].

@bnjbvr

• yes
• selectOnlyIfUnchangeFilteredOperations will by use to select the operations to be displayed
• the currenct filter in operations/index.js function does not not fit the current approach
• join : nice catch, i'll fix

• (bullet 2) in which case? the name really isn't talkative to me. What about the two other functions?
• (bullet 3) why?