Declaring variables in Power Query M Functions - powerbi

Question

I am trying to create a reusable function in Power Query that will be used by several tables.
This works well (written in blank query):
let
is_emergency = (color as text) =>
if color = "red" or color = "orange" then
"emergency"
else
"not emergency"
in
is_emergency
I can call it using a custom column like this =emergency([color_column]).
However - my color column contains a lot of extra spaces so I somehow need to call Text.Trim() on the color-parameter. How to write this?
What I thought would work was to just write this:
let
is_emergency = (color as text) =>
color = Text.Trim(color, " "),
if color = "red" or color = "orange" then
"emergency"
else
"not emergency"
in
is_emergency
but this gives me the error Token Literal Expected.
How to write it proper? I am aware I can use the Power Query GUI to create simple functions like this, but my real case is more advanced and I would like to understand the M syntax.

Answer 1

I managed to solve it myself after some research.
let
is_emergency = (color as text) =>
// you need to put the variable declaration inside a new let - in
let
trimmed_color = Text.Trim(color, " "),
// you also need to define the return value and return it in the new let - in
return_value = if trimmed_color = "red" or trimmed_color = "orange" then
"emergency"
else
"not emergency"
in
return_value
in
is_emergency