w3resource

JavaScript: Find the number which appears most in a given array of integers

JavaScript Basic: Exercise-94 with Solution

Write a JavaScript program to find the number which appears most in a given array of integers.

Pictorial Presentation:

JavaScript: Find the number which appears most in a given array of integers.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Find the number which appears most in a given array of integers</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function array_element_mode(arr) {
  var ctr = [],
    ans = 0;

  for(var i = 0; i < 10; i++) {
    ctr.push(0);
  }
  for(var i = 0; i < arr.length; i++) {
    ctr[arr[i] - 1]++;
    if(ctr[arr[i] - 1] > ctr[ans]) {
      ans = arr[i] - 1;
    }
  }
  return ans + 1;  
}
console.log(array_element_mode([1, 2, 3, 2, 2, 8, 1, 9]))

Sample Output:

2

Flowchart:

Flowchart: JavaScript - Find the number which appears most in a given array of integers

ES6 Version:

function array_element_mode(arr) {
  const ctr = [];
  let ans = 0;

  for(var i = 0; i < 10; i++) {
    ctr.push(0);
  }
  for(var i = 0; i < arr.length; i++) {
    ctr[arr[i] - 1]++;
    if(ctr[arr[i] - 1] > ctr[ans]) {
      ans = arr[i] - 1;
    }
  }
  return ans + 1;
}
console.log(array_element_mode([1, 2, 3, 2, 2, 8, 1, 9]))

Live Demo:

See the Pen javascript-basic-exercise-94 by w3resource (@w3resource) on CodePen.


Contribute your code and comments through Disqus.

Previous: Write a JavaScript program to find the maximum difference among all possible pairs of a given array of integers.
Next: Write a JavaScript program to replace all the numbers with a specified number of a given array of integers.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Share this Tutorial / Exercise on : Facebook and Twitter

JavaScript: Tips of the Day

Checks if a string is an anagram of another string (case-insensitive, ignores spaces, punctuation and special characters)

Example:

const isAnagram = (str1, str2) => {
  const normalize = str =>
    str
      .toLowerCase()
      .replace(/[^a-z0-9]/gi, '')
      .split('')
      .sort()
      .join('');
  return normalize(str1) === normalize(str2);
};
console.log(isAnagram('iceman', 'cinema')); // true

Output:

true