If you only want one instance that matches certain criteria out of a collection, it's far more efficient to grab the first matching item than it is to fully filter the collection for your criteria and then only use a single value.
== Noncompliant Code Example
----
let one = arr.filter { $0.containsString("yo") }.first // Noncompliant
== Compliant Solution
let one = arr.first(where: { $0.containsString("yo") })
ifdef::env-github,rspecator-view[]
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== Implementation Specification
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include::message.adoc[]
include::highlighting.adoc[]
endif::env-github,rspecator-view[]