1 files changed, 10 insertions, 0 deletions
diff --git a/util/japanese.ts b/util/japanese.ts
index d398b60..8381608 100644
--- a/util/japanese.ts
+++ b/util/japanese.ts
@@ -59,6 +59,9 @@ declare global {
 		 */
 		japaneseOnly(strict?: boolean): boolean
 
+		/** @summary check if the string contains kanji characters */
+		hasKanji(): boolean;
+
 		/** @summary convert any half-width katakana to full-width */
 		widenKatakana(): string;
 
@@ -270,3 +273,10 @@ String.prototype.normalizeKana = function() {
 	return this.widenKatakana().katakanaToHiragana();
 }
 
+String.prototype.hasKanji = function() {
+	for (var c of this)
+		if ([UnicodeRange.JapaneseKanji].includes(c.range()))
+			return true;
+	return false;
+}
+