Refactor a function

[SaaM]

Hello,

I am trying to refactor this function that I apply on 10 differents columns.

fnConcatenate = (tbl as table) => Table.AddColumn(tbl, "field_1_combined", each if [id]>[linenumber] then Text.Combine(Table.SelectRows(tbl, (sel)=> sel[key] = [key] and sel[id]>= [id])[#"field_1"]) else [#"field_1"]),


fnConcatenate = (tbl as table) => Table.AddColumn(tbl, "field_2_combined", each if [id]>[linenumber] then Text.Combine(Table.SelectRows(tbl, (sel)=> sel[key] = [key] and sel[id]>= [id])[#"field_2"]) else [#"field_2"]),
 
... 

fnConcatenate = (tbl as table) => Table.AddColumn(tbl, "field_10_combined", each if [id]>[linenumber] then Text.Combine(Table.SelectRows(tbl, (sel)=> sel[key] = [key] and sel[id]>= [id])[#"field_10"]) else [#"field_10"]),

Is it possible to have something like this

fnConcatenate = (tbl as table, field as text) => Table.AddColumn(tbl, "field" + "_combined", each if [id]>[linenumber] then Text.Combine(Table.SelectRows(tbl, (sel)=> sel[key] = [key] and sel[id]>= [id])[#"field"]) else [#"field"]),

?

Thanks

Kind regards

Saam

[Anonymous · Accepted solution]

try

fnConcatField = (tbl as table, field as text) => Table.AddColumn(tbl, field & "_combined", each 
                                if [id]>[linenumber] then Text.Combine( Table.Column(Table.SelectRows(tbl, (sel)=> sel[key] = [key] and sel[id]>= [id]), field)) else Record.Field(_, field))

try something like this (I haven't tested it)  

[lbendlin]

Column names can be created dynamically

fnConcatenate = (tbl as table, field as text) => Table.AddColumn(tbl, field + "_combined", 

but they cannot be referenced (easily) dynamically. Have you considered using Expression.Evaluate() for this?

[SaaM]

I never used Expression.Evaluate()

I will look for this approach

Thanks

Kind regards,

Saam