Challenge resolved in our third activity at Microverse - Week 3 - Day 5

pickNumbers.js

function pickingNumbers(a) {
    const frequencyMap = new Map();
    
    for (let i = 0; i < a.length; i++) {
        const num = a[i];
        if (frequencyMap.has(num)) {
            frequencyMap.set(num, frequencyMap.get(num) + 1);
        } else {
            frequencyMap.set(num, 1);
        }
    }

    let maxLength = 0;

    const numKeys = Array.from(frequencyMap.keys());
    for (let i = 0; i < numKeys.length; i++) {
        const num = numKeys[i];
        const frequency = frequencyMap.get(num);
        const nextFrequency = frequencyMap.get(num + 1) || 0;
        const currentLength = frequency + nextFrequency;
        maxLength = Math.max(maxLength, currentLength);
    }

    return maxLength;
}