Function.ScalarVector in M / Power Query

Husain · ‎05-07-2019

Hi Gurus

I am trying to pull information for certain US stocks from finance.yahoo.com

The web address follows a similar pattern for all stock symbols

https://finance.yahoo.com/quote/AAPL/key-statistics?p=AAPL

So I wrote a custom function

(Ticker) => try Web.Page(
Web.Contents("https://finance.yahoo.com/quote/" & Ticker & "/key-statistics?p=" & Ticker,[Timeout=#duration(0,0,0,10)])) otherwise null

and invoked it over the symbols i have.
It works but is very slow when i use 500 + symbols

I read about function.scalarvector in Chris Webb's blog

https://blog.crossjoin.co.uk/2018/11/16/function-scalarvector-optimise-power-query-m-functions/

Please could you help me optimize the web queries using this or any other way

I tried with following. It works but does not optimize the query

Function.ScalarVector(
    type function(Tickersymbol as text) as text,
    (InputTable) =>
        let
            BufferTable = Table.Buffer(InputTable),
            InputList = BufferTable[Tickersymbol],
            CallFunction = GetStatistics(InputList)            
        in
            CallFunction
)

Please the see the file for more clarity

https://drive.google.com/file/d/12C280ItzuSf7D6cYr-Nl8wj9NzuCeAxu/view?usp=sharing