Skip to main content
cancel
Showing results for 
Search instead for 
Did you mean: 

Calling all Data Engineers! Fabric Data Engineer (Exam DP-700) live sessions are back! Starting October 16th. Sign up.

Reply
Anonymous
Not applicable

M code optimization

Hello

I would like to optimize the code of power query when I do search / replace

In a date field I process 3 types of modifications in a row and I would like to make these 3 modifications on a single line of code

 

#"Filtered rows4" = Table.SelectRows(#"Replaced errors", each true),

 

#"Replaced Value3" = Table.ReplaceValue(#"Filtered Lines4",null, "12/31/2050",Replace.ReplaceValue,{"Theoretical Date Lease End"}),

 

#"ReplacedValue4" = Table.ReplaceValue(#"ReplacedValue3", "SO", "12/31/2050",Replacer.ReplaceText,{"Theoretical End of Lease Date"}),

 

#"Replaced Value5" = Table.ReplaceValue(#"Replaced Value4", "cf SM", "12/31/2050",Replacer.ReplaceText,{"Theoretical Date Lease End"}),

 

#"Replaced Value6" = Table.ReplaceValue(#"Replaced Value5", "cf CAS", "12/31/2050",Replacer.ReplaceText,{"Theoretical Date Lease End"}),

 

My proposal that doesn't work for the moment

= List.ReplaceValue(#"ReplacedValue3", "SO", "cf CAS", "cf SM", "31/12/2050",Replacer.ReplaceText,{"Theoretical End of Lease Date"})

 

Obviously it only takes my 3 fields to replace

Thanks for your help

 

2 REPLIES 2
CNENFRNL
Community Champion
Community Champion

#"Filtered rows4" = Table.SelectRows(#"Replaced errors", each true),

this line is nothing but gibberish.

 

#"Replaced Value3" = Table.ReplaceValue(#"Filtered Lines4",each [Theoretical Date Lease End], each if List.Contains({null, "cf CAS", "cf SM"}, [Theoretical Date Lease End]) then "12/31/2050" else [Theoretical Date Lease End], Replace.ReplaceValue, {"Theoretical Date Lease End"}),

 


Thanks to the great efforts by MS engineers to simplify syntax of DAX! Most beginners are SUCCESSFULLY MISLED to think that they could easily master DAX; but it turns out that the intricacy of the most frequently used RANKX() is still way beyond their comprehension!

DAX is simple, but NOT EASY!

Fowmy
Super User
Super User

@Anonymous 

You add the following step after #"Filtered rows4" step

 Table.TransformColumns(#"Filtered Lines4", {{"Channel", each if List.Contains({"SO", "cf CAS", "cf SM"},_) then "12/31/2050" else _, type text}})

  

Did I answer your question? Mark my post as a solution! and hit thumbs up


Subscribe and learn Power BI from these videos

Website LinkedIn PBI User Group

Helpful resources

Announcements
FabCon Global Hackathon Carousel

FabCon Global Hackathon

Join the Fabric FabCon Global Hackathon—running virtually through Nov 3. Open to all skill levels. $10,000 in prizes!

September Power BI Update Carousel

Power BI Monthly Update - September 2025

Check out the September 2025 Power BI update to learn about new features.

FabCon Atlanta 2026 carousel

FabCon Atlanta 2026

Join us at FabCon Atlanta, March 16-20, for the ultimate Fabric, Power BI, AI and SQL community-led event. Save $200 with code FABCOMM.

Top Solution Authors
Top Kudoed Authors