Array aggregator ; how to use it for grouping the flatten data and sorting within the group?

Questions
1

I have input array data to aggregator is this:
Name (A)

Ms Rupam Srivastava

  • Age (B)

    64

  • Report Date (C)

    7/6/2025

  • Category (D)

    Blood Counts

  • Test (E)

    Hemoglobin

  • Value (F)

    11.5

  • Lower Ref (G)

    12

  • Upper Ref (H)

    15

  • Unit (I)

    g/dL

  • Status (J)

    out of range

  • Bundle order position

    1

  • Total number of bundles

    63

    But I want to convert it into this:
    {
    “test”: “Creatinine”,
    “category”: “Kidney Profile”,
    “unit”: “mg/dL”,
    “refLow”: 0.57,
    “refHigh”: 1.11,
    “latestDate”: “2025-07-06”,
    “latestValue”: 3.41,
    “series”: [
    {“date”:“2024-12-15”,“value”:2.6},
    {“date”:“2025-04-20”,“value”:2.9},
    {“date”:“2025-07-06”,“value”:3.41}
    ]
    }

    i.e. group certain fields and sort asc order within the group as shown above. Can somebody tell step by step how to achieve that?

3

Chatgpt is suggesting this but I am not able to follow it:
Tools → Array aggregator (group by Test, sort, and compute “latest”)

This is the key step. We’ll build a chart‑ready structure and compute each test’s latest point to decide if it’s out of range.

  • Source module: the Iterator (from Step 2)

  • Group by keys:

    • Test (map from the row)

    • Category (map from the row)

  • Order inside each group:
    Report Date ascending, but insert the normalization so the order is correct:

    • If YYYY-MM-DD in sheet:

      javascript

      CopyEdit

      {{formatDate(parseDate(Report Date; "YYYY-MM-DD"); "YYYY-MM-DD")}}

    • If MMM DD, YYYY:

      javascript

      CopyEdit

      {{formatDate(parseDate(Report Date; "MMM DD, YYYY"); "YYYY-MM-DD")}}

    • If DD/MM/YYYY:

      javascript

      CopyEdit

      {{formatDate(parseDate(Report Date; "DD/MM/YYYY"); "YYYY-MM-DD")}}

  • Aggregated top‑level fields per group (choose “Aggregate to” accordingly):

    • test → Test (First)

    • category → Category (First)

    • unit → Unit (First)

    • refLow → Lower Ref (First, then we’ll cast later or just leave numeric in Sheets)

    • refHigh → Upper Ref (First)

    Compute “latest” point (crucial):

    • latestDate → (map normalized date) (Last)

    • latestValue → Value (Last)

    (Because we sorted by date ascending, the “Last” value is the latest.)

  • Aggregated array (call it series) item fields:

    • date → the normalized date you used above (same formula)

    • value → Value

4

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