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Add guideline about empty strings inside interpolation. #952

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14 changes: 14 additions & 0 deletions README.adoc
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Expand Up @@ -4910,6 +4910,20 @@ message = "This is the #{result.to_s}."
message = "This is the #{result}."
----

=== Empty Strings In Interpolation [[empty-strings-in-interpolation]]

Don't assign empty strings inside string interpolation.
For conditionals, use modifier statements instead of ternaries with empty strings.

[source,ruby]
----
# bad
"#{condition ? 'foo' : ''}"

# good
"#{'foo' if condition}"
----

=== String Concatenation [[concat-strings]]

Avoid using `pass:[String#+]` when you need to construct large data chunks.
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