SOURCE

const towers = [
    { id: 3, name: 'N3', quantity: 430 },
    { id: 4, name: 'N4', quantity: 60 },
    { id: 5, name: 'N5', quantity: 90 },
    { id: 6, name: 'N6', quantity: 140 },
    { id: 7, name: 'N7', quantity: 250 },
]

function divide(towers, quantityPerTable) {
    const result = []
    let currentGroup = null
    const resetGroup = () => currentGroup = { total: 0, towers: [] }
    const addTower = t => {
        currentGroup.towers.push(t)
        currentGroup.total += t.quantity
    }
    const completeGroup = () => {
        console.log('completed', currentGroup)
        let tempTotal = currentGroup.total
        if (tempTotal > quantityPerTable) {
            let tTower = currentGroup.towers[0]
            splitTower(tempTotal, tTower)

        } else {
            // console.log('2', currentGroup)
            result.push(currentGroup)
        }
        resetGroup()
    }

    const splitTower = (tempTotal, tTower) => {
        let tempTower ={
            ...tTower
        }
        if(tempTotal <= 0){
            return
        }
        if (tempTotal >= quantityPerTable) {
            const tempGroup = { total: 0, towers: [] }
            tempGroup.total = quantityPerTable
            tempTower.quantity = quantityPerTable
            tempGroup.towers.push(tempTower)
            result.push(tempGroup)
            splitTower((tempTotal-quantityPerTable).toFixed(3), tTower)
        } else {
            const tempGroup = { total: 0, towers: [] }
            tempGroup.total = tempTotal
            tempTower.quantity = tempTotal
            tempGroup.towers.push(tempTower)
            result.push(tempGroup)
        }

        // console.log('tempTotal', tempTower)
    }

    resetGroup()


    towers.forEach((tower, index) => {

        if (currentGroup.total >= quantityPerTable) {
            completeGroup()
        }
        if (
            currentGroup.towers.length > 0
        ) {
            completeGroup()
        }

        addTower(tower)

        if (index === towers.length - 1) {
            completeGroup()
        }
    })
    return result
}

console.log(divide(towers, 100))