Sanjana's Implementation of Identifying the Most Common Word in a Paragraph

app.js

@@ -1,8 +1,76 @@
 /**
+Purpose: write one or more methods that returns the most common words
+The answer is unique, and written in lowercase (even if its occurrences in paragraph may have uppercase symbols, 
+  and even if it is a proper noun.)
+Paragraph only consists of letters, spaces, or the punctuation symbols !?',;.
+There are no hyphens or hyphenated words.
+Words only consist of letters, never apostrophes or other punctuation symbols.
+ */
+
+ /**
+  Plan Of Action: 
+  - remove punctuation and make lowercase 
+  - remove banned word from paragraph 
+  - identify most frequent word and return 
+  */
+
+ function getWordsWithHighestFreq(paragraphArr) { 
+    var frequencyDict = new Object(); 
+
+    //Adds words from paragraph into a dictionary 
+    for (var i = 0; i < paragraphArr.length; i++) {
+      var key = paragraphArr[i]; 
+
+      if(key in frequencyDict) {
+        value = frequencyDict[key]; 
+        frequencyDict[key] = value + 1; 
+      } else { 
+        frequencyDict[key] = 1; 
+      }
+    }
+    console.log("The values in the dictioanry are the following: ", frequencyDict); 
+
+
+    //Identify the number of the maximum occurance of a word
+    var max = 0;
+
+    for(const [key, value] of Object.entries(frequencyDict)) {
+      if(value > max) {
+        max = value;
+      }
+    }
+    console.log("The maximum occurance of a word is: ", 2)
+
+    //Parse dictionary to retrieve words of highest count 
+    var wordsOfHighFrequency = []
+
+    for(const [key, value] of Object.entries(frequencyDict)) {
+      if(value == max) {
+        wordsOfHighFrequency.push(key); 
+      }
+    }
+    console.log("The most common words are", wordsOfHighFrequency);
+
+    return wordsOfHighFrequency; 
+ }
+
+ /**
  * @param {string} paragraph
  * @param {string[]} banned
  * @return {string}
  */
 const mostCommonWord = (paragraph, banned) => {
+  var noPunctuationParagraph = paragraph.toLowerCase().replace(/(!|;|'|,|\.|\?)/g,"").trim();
+  console.log("The paragraph written in lowercase and without punctuation is the following: " ,noPunctuationParagraph);
+
+  var wordsInPargrphArr = noPunctuationParagraph.split(" "); 
+  wordsInPargrphArr = wordsInPargrphArr.filter(word => word != banned);
+  console.log("The array of words in paragraph without the banned word is the following: ", wordsInPargrphArr); 
+
+  //method retrieves the word with the highest frequency 
+  const mostCommonWord = getWordsWithHighestFreq(wordsInPargrphArr);
+  return mostCommonWord.values();
+
+};
 
-};
+mostCommonWord("THE CAT IS HERE, and dog is here?", "cat");