js problem 3

var input = [
    {name: "A", href: "ak-1/1"},
    {name: "A1", href: "ak-1/1/123"},
    {name: "A2", href: "ak-1/1/2345"},
    {name: "B", href: "ak-1/2"},
    {name: "B1", href: "ak-1/2/123"},
];

var output = [
    {
        name: "A",
        href: "ak-1/1",
        _children: [
            {name: "A1", href: "ak-1/1/123"},
            {name: "A2", href: "ak-1/1/2345"},
        ]
    },
    {
        name: "B",
        href: "ak-1/2",
        _children: [
            {name: "B1", href: "ak-1/2/123"},
        ]
    }
];