When comparing two Indexables (Indexable#==) it is safe to access

other's value through unsafe_at as its size has already been checked.
crystal-lang · Feb 20, 2017 · 44c859f · 44c859f
1 parent 2bc0030
commit 44c859f
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/src/indexable.cr b/src/indexable.cr
@@ -211,6 +211,15 @@ module Indexable(T)
     size == 0
   end
 
+  # Optimized version of `equals?` used when `other` is also an `Indexable`.
+  def equals?(other : Indexable)
+    return false if size != other.size
+    each_with_index do |item, i|
+      return false unless yield(item, other.unsafe_at(i))
+    end
+    true
+  end
+
   # Determines if `self` equals *other* according to a comparison
   # done by the given block.
   #