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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.


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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.

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04