cd-slash
I have a case clause (contrived for the purpose of this question):
level = 4
has_children_or_no_children = :no_children
case {level, has_children_or_no_children} do
{3, :has_children} ->
1
{4, :no_children} ->
2
_ ->
false
end
This works well. Normally though, with a single value in the case clause I can use a guard to match on greater than / less than integer values:
level = 4
has_children_or_no_children = :no_children
case level do
n when n < 5 ->
1
n when n > 0 ->
2
_ ->
false
end
Which again works well, but I can’t use these guard clauses inside the tuple passed to case in the first example:
level = 4
has_children_or_no_children = :no_children
# DOES NOT WORK
case {level, has_children_or_no_children} do
{n when n < 5, :has_children} ->
1
{n when n > 0, :no_children} ->
2
_ ->
false
end
Is there a way to perform a boolean test and a comparison with an atom simultaneously, to avoid having to nest case statements and duplicate the code to be executed?
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First 3 of 3 Posts
sbuttgereit
The guard needs to be outside of the match:
nikolauska
You need to move the
whenoutside the tuple and then it workscd-slash
Ahh that seems so easy (and nice) now that I see the solution! Thanks for your help