last update before handover

sample_interface/node_modules/is-alphabetical/index.js

@@ -0,0 +1,16 @@
+/**
+ * Check if the given character code, or the character code at the first
+ * character, is alphabetical.
+ *
+ * @param {string|number} character
+ * @returns {boolean} Whether `character` is alphabetical.
+ */
+export function isAlphabetical(character) {
+  const code =
+    typeof character === 'string' ? character.charCodeAt(0) : character
+
+  return (
+    (code >= 97 && code <= 122) /* a-z */ ||
+    (code >= 65 && code <= 90) /* A-Z */
+  )
+}