lengthofLargestSubarrayWithContinuousElements.js

const lengthofLargestSubarrayWithContinuousElements = (arr) => {
  
    arr.sort()
  
    let count = []
    let inLen = arr.length
    let j = 0
    let initalCount = 1
  
    for (let i = 0; i < inLen; i++) {
    
        while( (arr[i] + 1) == arr[i+1] ) {
            count[j] = initalCount + 1
            initalCount++
            i++
        }
        
        initalCount = 1
        j++
    }
  
    // filter null elements from an array
    count = count.filter(Number)
    
    return Math.max(...count)
};

console.log(lengthofLargestSubarrayWithContinuousElements([4, 2, 1, 20])) // 2

console.log(lengthofLargestSubarrayWithContinuousElements([2, 4, 3])) // 3

console.log(lengthofLargestSubarrayWithContinuousElements([1, 563, 585, 571, 90, 92, 94, 93, 91, 45])) // 5