Update index.js

Author: el634dev

src/index.js

@@ -3,6 +3,11 @@ class Strings {
         this._string = string
     }
 
+    /**
+     * Returns a string with the first letter capitalized
+     * @param {Strings} str - Local variable used to slice and capitalize the first letter
+     * @returns {Date} - string with the first letter capitalized
+    */
     capitalize(str) {
         const firstLetter = str[0].toUpperCase()
         const lastLetters = str.slice(1)
@@ -15,4 +20,4 @@ class Strings {
     }
 }
 
-module.exports.Strings = Strings;
+module.exports.Strings = Strings;