Migratory Birds Hackerrank

birds.ts

function migratoryBirds(arr: number[]): number {
    // Write your code here
    let birdCount: { [key: number]: number} = {}
    let maxId = 0
    let maxIdCount = 0

    arr.forEach(bid => {
        if (birdCount[bid] !== undefined) {
            birdCount[bid]++
        } else {
            birdCount[bid] = 1
        }
        if (birdCount[bid] > maxIdCount) {
            maxId = bid
            maxIdCount = birdCount[bid]
        } else if (birdCount[bid] === maxIdCount && bid < maxId) {
            maxId = bid
        }
    })
    return maxId
}

const birds = [
    1, 5, 5, 5, 4, 4, 4, 3
]

const birdid = migratoryBirds(birds)

console.log(birdid)