rspec/rules/S1155/swift/rule.adoc

== Why is this an issue?

Using ``++[Int]().count++`` to test for emptiness works, but using ``++[Int]().isEmpty++`` makes the code more readable and can be more performant. The time complexity of any ``++isEmpty++`` implementation should be ``++O(1)++`` whereas some implementations of ``++count()++`` can be ``++O(n)++``.

=== Noncompliant code example

[source,swift]
----
if (arr.count == 0) {  // Noncompliant
  /* ... */
}
----

=== Compliant solution

[source,swift]
----
if (arr.isEmpty) {
  /* ... */
}
----

ifdef::env-github,rspecator-view[]

'''
== Implementation Specification
(visible only on this page)

include::../message.adoc[]

'''
== Comments And Links
(visible only on this page)

=== on 8 Jul 2016, 20:40:54 Ann Campbell wrote:
https://github.com/realm/SwiftLint/blob/master/Source/SwiftLintFramework/Rules/EmptyCountRule.swift

include::../comments-and-links.adoc[]

endif::env-github,rspecator-view[]