Most recurring character

Author: Tittoh

README.md

@@ -9,3 +9,4 @@ Once inside, run the command below:
 
 1. String reversal
 2. Vowels counter
+3. Most recurring character

src/maxRecurring/index.js

@@ -0,0 +1,23 @@
+// pick a solution and insert here to run the test.
+
+function maxRecurringChar(text) {
+    let charMap = {}
+    let maxCharValue = 0
+    let maxChar = ''
+    for (let char of text) {
+        if (charMap.hasOwnProperty(char)) {
+            charMap[char]++
+        } else {
+            charMap[char] = 1
+        }
+    }
+    for (let char in charMap) {
+        if (charMap[char] > maxCharValue) {
+            maxCharValue = charMap[char]
+            maxChar = char
+        }
+    }
+    return maxChar
+}
+
+module.exports = maxRecurringChar;

src/maxRecurring/solutions.js

@@ -0,0 +1,41 @@
+// FOR...IN ITERATION METHOD
+function maxRecurringChar(text) {
+    let charMap = {}
+    let maxCharValue = 0
+    let maxChar = ''
+    for (let char of text) {
+        if (charMap.hasOwnProperty(char)) {
+            charMap[char]++
+        } else {
+            charMap[char] = 1
+        }
+    }
+    for (let char in charMap) {
+        if (charMap[char] > maxCharValue) {
+            maxCharValue = charMap[char]
+            maxChar = char
+        }
+    }
+    return maxChar
+}
+
+// FORMING ARRAYS FROM THE CHARACTER MAP METHOD
+function maxRecurringChar(text) {
+    let charMap = {}
+    let charArray =[]
+    let vaulesArray = []
+    let maxCharValue = 0
+
+    for (let char of text) {
+        if (charMap.hasOwnProperty(char)) {
+            charMap[char]++
+        } else {
+            charMap[char] = 1
+        }
+    }
+    charArray = Object.keys(charMap)
+    vaulesArray = Object.values(charMap)
+    maxCharValue = Math.max(...vaulesArray)
+    
+    return charArray[vaulesArray.indexOf(maxCharValue)]
+}

src/maxRecurring/test.js

@@ -0,0 +1,17 @@
+const maxRecurringChar = require('./index');
+
+test('maxRecurringChar is a function', () => {
+  expect(typeof maxRecurringChar).toEqual('function');
+});
+
+test('Finds the most frequently used character', () => {
+  expect(maxRecurringChar('sisusbsnshsjsmskslstsw')).toEqual('s');
+});
+
+test('Finds the most frequently used character even with mixed capitalization', () => {
+  expect(maxRecurringChar('AbAdAabnmkAAAynjfaA')).toEqual('A');
+});
+
+test('Finds the most used number as well', () => {
+  expect(maxRecurringChar('b2n3n2m2l2k2i2o2')).toEqual('2');
+});