Find the most frequent number in the array and how many times it is repeated in JavaScript

We are required to write a JavaScript function that takes in an array of literals and finds the most frequent number in the array and how many times it is repeated.

Example

The code for this will be −

const arr = ['13', '4', '1', '1', '4', '2', '3', '4', '4', '1', '2', '4', '9', '3'];
const findFrequency = (arr = []) => {
   const count = {};
   const max = arr.reduce((acc, val, ind) => {
      count[val] = (count[val] || 0) + 1;
      if (!ind || count[val] > count[acc[0]]) {
         return [val];
      };
      if (val !== acc[0] && count[val] === count[acc[0]]) {
         acc.push(val);
      };
      return acc;
   }, undefined);
   return {
      max, count
   };
}
console.log(findFrequency(arr));

Output

And the output in the console will be −

{
   max: [ '4' ],
   count: { '1': 3, '2': 2, '3': 2, '4': 5, '9': 1, '13': 1 }
}

AmitDiwan

Updated on 23-Nov-2020 10:09:48

• Related Questions & Answers
• Find the second most frequent element in array JavaScript
• Find Second most frequent character in array - JavaScript
• Finding the most frequent word(s) in an array using JavaScript
• Finding the second most frequent character in JavaScript
• Return the element that appears for second most number of times in the array JavaScript
• C# program to find the most frequent element
• Get the item that appears the most times in an array JavaScript
• Most Frequent Number in Intervals in C++
• How many times can we sum number digits in JavaScript
• Finding number of occurrences of the element appearing most number of times in JavaScript
• Is element repeated more than n times in JavaScript
• Most frequent element in an array in C++
• Find the k most frequent words from data set in Python
• Program to find frequency of the most frequent element in Python
• Program to find out the index of the most frequent element in a concealed array in Python