diff --git a/Source/Modules/LangModelRelated/SubLMs/lmAssociates.swift b/Source/Modules/LangModelRelated/SubLMs/lmAssociates.swift
index 2e894159..db15a73a 100644
--- a/Source/Modules/LangModelRelated/SubLMs/lmAssociates.swift
+++ b/Source/Modules/LangModelRelated/SubLMs/lmAssociates.swift
@@ -115,10 +115,7 @@ extension vChewing {
 		}
 
 		public func hasValuesFor(key: String) -> Bool {
-			if let arrEntry = keyValueMap[key] {
-				return !arrEntry.isEmpty
-			}
-			return false
+			keyValueMap[key] != nil
 		}
 	}
 }
diff --git a/Source/Modules/LangModelRelated/SubLMs/lmCore.swift b/Source/Modules/LangModelRelated/SubLMs/lmCore.swift
index 0ee1cf8a..cd3c060c 100644
--- a/Source/Modules/LangModelRelated/SubLMs/lmCore.swift
+++ b/Source/Modules/LangModelRelated/SubLMs/lmCore.swift
@@ -159,10 +159,7 @@ extension vChewing {
 		}
 
 		open func hasUnigramsFor(key: String) -> Bool {
-			if let arrEntry = keyValueScoreMap[key] {
-				return !arrEntry.isEmpty
-			}
-			return false
+			keyValueScoreMap[key] != nil
 		}
 	}
 }
diff --git a/Source/Modules/LangModelRelated/SubLMs/lmLite.swift b/Source/Modules/LangModelRelated/SubLMs/lmLite.swift
index e06e02eb..5a9faead 100644
--- a/Source/Modules/LangModelRelated/SubLMs/lmLite.swift
+++ b/Source/Modules/LangModelRelated/SubLMs/lmLite.swift
@@ -136,10 +136,7 @@ extension vChewing {
 		}
 
 		public func hasUnigramsFor(key: String) -> Bool {
-			if let arrEntry = keyValueMap[key] {
-				return !arrEntry.isEmpty
-			}
-			return false
+			keyValueMap[key] != nil
 		}
 	}
 }
diff --git a/Source/Modules/LangModelRelated/SubLMs/lmReplacements.swift b/Source/Modules/LangModelRelated/SubLMs/lmReplacements.swift
index d18c21eb..b189f8d5 100644
--- a/Source/Modules/LangModelRelated/SubLMs/lmReplacements.swift
+++ b/Source/Modules/LangModelRelated/SubLMs/lmReplacements.swift
@@ -105,11 +105,7 @@ extension vChewing {
 		}
 
 		public func valuesFor(key: String) -> String {
-			var v = ""
-			if let matched = keyValueMap[key] {
-				v = matched
-			}
-			return v
+			keyValueMap[key] ?? ""
 		}
 	}
 }