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Schizzomarino
Helper I
Helper I

Problem using "d3-array".rollup (and it spread argument) in a Power BI Custom Visual

Hello to you all,

I am hoping someone will have a solution for a problem I have encountered using "d3-array" in a custom visual for Power BI.
I have been using d3 v5 as it's got really nice data munching functions that keep my code clean and give good performance; but some of these are now giving me trouble: the rollup function from "d3-array" in particular. Here a description of my situation:

 
After importing d3 and rollup from d3-array (as rollup), and installing the typescript definitions, when I try to use rollup with two keys, i.e.:
Array.from(rollup(data, ([d]) => d.value, d => +d.date, d => d.name))
I get the following error for the above line: "Expected 3 arguments, but got 4"
If I remove the second or first key the above works, but then I don't get the Map I am looking for and would have liked to keep the above code as it is just so clean...
 

A small part of the data for clarity:

[{"date":36526,"name":"Coca-Cola","category":"Beverages","value":72537},{"date": 36526,"name": "Microsoft","category": "Technology", "value":70196},...]

Any typescript advice on how to get this to work?

Notes:
Rollup takes arguments in this form: (valuesreduce, ...keys); so that keys can be multiple. 

This works perfectly fine in a standard web page with the same d3 and d3-array libraries.

Thanks in advance for any advice on the above

Daniel

1 ACCEPTED SOLUTION
Schizzomarino
Helper I
Helper I

I have just realised I put this in the wrong place (should be within "Custom Visuals Development Discussion"

So I will duplicate this there, sorry... I am a newbie to the board

View solution in original post

1 REPLY 1
Schizzomarino
Helper I
Helper I

I have just realised I put this in the wrong place (should be within "Custom Visuals Development Discussion"

So I will duplicate this there, sorry... I am a newbie to the board

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