Suppose a particular JavaScript array contains list of (more than 15) Numeric character

Suppose a Particular JavaScript array Contains list of (More than 15) numeric and character value i.e [1,2,3,4,’A’,’B’,’C’,’A’,’A’,’A’,1,1,3,3,’D’,’D’,’E’]

Write a JavaScript Program to find out the most frequent elements in that array. 

Solution:

function findMostFrequentElements(arr) {
    const frequencyMap = new Map();

    // Count the frequency of each element in the array
    arr.forEach(item => {
        if (frequencyMap.has(item)) {
            frequencyMap.set(item, frequencyMap.get(item) + 1);
        } else {
            frequencyMap.set(item, 1);
        }
    });

    // Find the maximum frequency
    let maxFrequency = 0;
    frequencyMap.forEach(value => {
        if (value > maxFrequency) {
            maxFrequency = value;
        }
    });

    // Find elements with the maximum frequency
    const mostFrequentElements = [];
    frequencyMap.forEach((value, key) => {
        if (value === maxFrequency) {
            mostFrequentElements.push({ item: key, frequency: value });
        }
    });

    return mostFrequentElements;
}

const inputArray = [1, 2, 3, 4, 'A', 'B', 'C', 'A', 'A', 'A', 1, 1, 3, 3, 'D', 'D', 'E'];
const mostFrequent = findMostFrequentElements(inputArray);

mostFrequent.forEach(item => {
    console.log(`Array item ${item.item} , appears ${item.frequency} times`);
});

Output: Most frequent elements in that array

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