Created ignoreAlphaCase transform.

3 files changed, 15 insertions, 2 deletions

diff --git a/core/source/main/scala/com/rockymadden/stringmetric/Transform.scala b/core/source/main/scala/com/rockymadden/stringmetric/Transform.scala
index 390c4f2..c2cdace 100644
--- a/core/source/main/scala/com/rockymadden/stringmetric/Transform.scala
+++ b/core/source/main/scala/com/rockymadden/stringmetric/Transform.scala
@@ -65,5 +65,7 @@ object Transform {
 		val filterUpperCase: StringTransform = (ca) => filter(ca, c => UpperCase.contains(c.toInt))
 
 		val filterNotUpperCase: StringTransform = (ca) => filterNot(ca, c => UpperCase.contains(c.toInt))
+
+		val ignoreAlphaCase: StringTransform = (ca) => ca.map(c => if (c >= 65 && c <= 90) (c + 32).toChar else c)
 	}
 }
diff --git a/core/source/test/scala/com/rockymadden/stringmetric/TransformSpec.scala b/core/source/test/scala/com/rockymadden/stringmetric/TransformSpec.scala
index 5b93cfa..2349a6a 100644
--- a/core/source/test/scala/com/rockymadden/stringmetric/TransformSpec.scala
+++ b/core/source/test/scala/com/rockymadden/stringmetric/TransformSpec.scala
@@ -167,4 +167,15 @@ final class TransformSpec extends ScalaTest { "StringTransform" should provide {
 			}
 		}
 	}
+	"ignoreAlphaCase()" when passed {
+		"String" should returns {
+			"transformed String" in {
+				StringTransform.ignoreAlphaCase(
+					("aBc123" + 0x250.toChar).toCharArray
+				) should equal (
+					("abc123" + 0x250.toChar).toCharArray
+				)
+			}
+		}
+	}
 }}
diff --git a/readme.md b/readme.md
index 119fd90..2c0b2ea 100755
--- a/readme.md
+++ b/readme.md
@@ -264,9 +264,9 @@ Single filter, so that we only examine alphabetical characters:
 
 ---
 
-Functionally composed filter, so that we only examine uppercase characters:
+Functionally composed filter, so that we only examine alphabetical characters but the case won't matter:
 ```scala
-val composedTransform = (StringTransform.filterAlpha andThen StringTransform.filterUpperCase)
+val composedTransform = (StringTransform.filterAlpha andThen StringTransform.ignoreAlphaCase)
 
 (MetaphoneAlgorithm withTransform composedTransform).compute("abc123")
 (MetaphoneMetric withTransform composedTransform).compare("abc123", "abc456")