11const stringClassExtensions = {
22
33 /**
4- * Returns true if the string contains vowels.
5- * @returns {Boolean }
4+ * hasVowels
5+ * Returns true if the string contains vowels or false if it does not
6+ * @returns {Boolean } true or false
67 */
78 hasVowels ( ) {
89 const vowelRegex = / [ a e i o u ] / i;
910 return vowelRegex . test ( this ) ;
1011 } ,
1112
1213 /**
13- * Returns the String in question but with all characters in upper cases as applicable.
14- * @returns {String }
14+ * toUpper
15+ * Returns the String in question but with
16+ * all characters in upper cases as applicable
17+ * @returns {String } string with all characters in upper case
1518 */
1619 toUpper ( ) {
1720 return this . replace ( / [ a - z ] / g, match => String
1821 . fromCharCode ( match . charCodeAt ( 0 ) - 32 ) ) ;
1922 } ,
2023
2124 /**
22- * Returns the String in question but with all characters in their lower cases as applicable.
23- * @returns {String }
25+ * toLower
26+ * Returns the string in question but with all
27+ * characters in their lower cases as applicable
28+ * @returns {String } string with all characters to lower case
2429 */
2530 toLower ( ) {
2631 return this . replace ( / [ A - Z ] / g, match => String
2732 . fromCharCode ( match . charCodeAt ( 0 ) + 32 ) ) ;
2833 } ,
2934
3035 /**
31- * Returns the String in question but changes the First Character to an Upper case.
32- * @returns {String }
36+ * ucFirst
37+ * Returns the string in question but changes the first character
38+ * to an Upper case.
39+ * @returns {String } string with capitalized first letter
3340 */
3441 ucFirst ( ) {
3542 return this . replace ( this [ 0 ] , this [ 0 ] . toUpper ( ) ) ;
3643 } ,
3744
3845 /**
46+ * isQuestion
3947 * Returns true if the string is a question (ending with a question mark)
40- * @returns {Boolean }
48+ * @returns {Boolean } true or false
4149 */
4250 isQuestion ( ) {
4351 const regexType = / \? $ / g;
4452 return regexType . test ( this ) ;
4553 } ,
4654
4755 /**
48- * Returns a list of the words in the string, as an Array.
49- * @returns {Array }
56+ * words
57+ * Returns a list of the words in the string, as an Array
58+ * @returns {Array } array of words in the string
5059 */
5160 words ( ) {
5261 return this . replace ( / [ ^ a - z 0 - 9 A - Z \s ] / g, '' ) . split ( / \s + / ) ;
5362 } ,
5463
5564 /**
65+ * wordCount
5666 * Returns the number of words in the string
57- * @returns {Number }
67+ * @returns {Number } number of words in the string
5868 */
5969 wordCount ( ) {
6070 return this . words ( ) . length ;
6171 } ,
6272
6373 /**
74+ * toCurrency
6475 * Returns a currency representation of the String
65- * @returns {String }
76+ * @returns {String } string of numbers
6677 */
6778 toCurrency ( ) {
79+ if ( ! Number ( this ) ) {
80+ return 'This is not a Number' ;
81+ }
6882 let [ number , decimal ] = this . split ( / \. / g) ;
6983 if ( decimal === undefined ) {
7084 decimal = '00' ;
@@ -76,7 +90,9 @@ const stringClassExtensions = {
7690 } ,
7791
7892 /**
93+ * fromCurrency
7994 * Returns a number representation of the Currency String
95+ * @returns {String } string of numbers
8096 */
8197 fromCurrency ( ) {
8298 let [ number , decimal ] = this . split ( / \. / g) ;
@@ -90,26 +106,29 @@ const stringClassExtensions = {
90106 } ,
91107
92108 /**
109+ * inverseCase
93110 * Returns each letter in the string as an inverse of its current case
94- * @returns {String }
111+ * @returns {String } inverted form of the string
95112 */
96113 inverseCase ( ) {
97114 return this . replace ( / \w / g, character => ( / [ a - z ] /
98115 . test ( character ) ? character . toUpper ( ) : character . toLower ( ) ) ) ;
99116 } ,
100117
101118 /**
119+ * alternatingCase
102120 * Returns the letters in alternating cases. It must start with a lower case
103- * @returns {String }
121+ * @returns {String } string in alternating cases starting with lower case
104122 */
105123 alternatingCase ( ) {
106124 return this . replace ( / \w / g, ( match , count ) =>
107125 ( count % 2 === 0 ? match . toLower ( ) : match . toUpper ( ) ) ) ;
108126 } ,
109127
110128 /**
129+ * getMiddle
111130 * Returns the character(s) in the middle of the string
112- * @returns {String }
131+ * @returns {String } character(s) in the middle of the string
113132 */
114133 getMiddle ( ) {
115134 const middlePosition = this . length / 2 ;
@@ -118,26 +137,33 @@ const stringClassExtensions = {
118137 } ,
119138
120139 /**
121- * Returns true if a string contains double characters(including whitespace character)
122- * @return {Boolean }
140+ * doubleCheck
141+ * Returns true if a string contains double characters
142+ * (including whitespace character)
143+ * @return {Boolean } true or false
123144 */
124145 doubleCheck ( ) {
125146 return / ( .) \1{ 1 } / . test ( this ) ;
126147 } ,
127148
128149 /**
150+ * isDigit
129151 * Test if string is single digit
130- * @return {Boolean }
152+ * @return {Boolean } true or false
131153 */
132154 isDigit ( ) {
133155 return / ^ \d { 1 } $ / g. test ( this ) ;
134156 } ,
135157
136158 /**
159+ * numberWords
137160 * Returns the numbers in words e.g 325 should return three two five.
138- * @returns {String }
161+ * @returns {String } string form of numbers
139162 */
140163 numberWords ( ) {
164+ if ( ! Number ( this ) ) {
165+ return 'This is not a Number' ;
166+ }
141167 const digitWordsMap = {
142168 0 : 'zero' ,
143169 1 : 'one' ,
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