如何在 JSON 中获取玩家物品数组中所有未拥有的物品

Question

I want to get all not owned items from a player items array what i tried

var players = {
"player1": {
    "items": [{
        "item1": {
            "owned": false,
            "price": 3000,
        },
        "item2": {
            "owned": true,
            "price": 3000,
        }
    }]
}
}

Object.keys(players).forEach(player => {
for(var i =0; i < players[player].items.length; i++) {
    var not_owned = players[player].items.filter(item => {return item.owned === false});
    console.log(not_owned.length);
}
});

but it is not giving me anything i tried to see the length and it gives me 0,

i tried to console.log it without length and it gives me undefined any ideas?

Answer 1

You need to get the inner items object values and then filter it

 var players = { "player1": { "items": [{ "item1": { "owned": false, "price": 3000, }, "item2": { "owned": true, "price": 3000, } }] } } Object.keys(players).forEach(player => { for(var i =0; i < players[player].items.length; i++) { var not_owned = Object.entries(players[player].items[i]).filter(([key, item]) => {return item.owned === false}); console.log(not_owned.length); } });

Answer 2

You don't need the for loop in there. Now for every iteration of the forEach the not owned will contain the items you want for this player.

var players = {
  "player1": {
    "items": [{
        "item1": {
            "owned": false,
            "price": 3000,
        },
        "item2": {
            "owned": true,
            "price": 3000,
        }
    }]
  }
}

Object.keys(players).forEach(player => {
  var not_owned = players[player].items.filter(item => {return item.owned === false});
  console.log(not_owned.length);
});