chore: solutions for find the most frequent value in as array

solutions/126.js

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+// Satish Jhanwer
+// Find the most frequent value in an array
+
+const solution = (arr) => {
+  // Creating Hash Map based on the unique value from the input array.
+  const myMap = arr.reduce((result, key) => {
+    result[key] = key in result ? result[key] + 1 : 1;
+    return result;
+  }, {});
+
+  // Defined the maxCount and resultant value which is most frequent
+  let maxCount = 0;
+  let result = -1;
+  const entries = Object.entries(myMap);
+  for (const [key, value] of entries) {
+    if (maxCount < value) {
+      result = key;
+      maxCount = value;
+    }
+  }
+  // Most frequent value in an array.
+  return parseInt(result, 10);
+};
+
+module.exports = {
+  solution,
+};

test/126.js

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+const expect = require('chai').expect;
+let solution = require('../solutions/126').solution;
+
+describe('Find the most frequent value in an array', () => {
+  it('should return 3 as most frequent value for [1,2,3,3].', () => {
+    const result = solution([1, 2, 3, 3]);
+    expect(result).to.equal(3);
+  });
+  it('should return 2 as most frequent value for [1,2,3,3,4,2,2].', () => {
+    const result = solution([1, 2, 3, 3, 4, 2, 2]);
+    expect(result).to.equal(2);
+  });
+});