我有陣列。
const arr = [{
"status": "success",
"data": [{
"name": "user1",
"games": [{
"id": 1,
"gamename": "cricket"
}, {
"id": 2,
"gamename": "football"
}]
},
{
"name": "user1",
"games": [{
"id": 1,
"gamename": "videogames"
}, {
"id": 2,
"gamename": "volleyball"
}]
}
]
}]
我嘗試按照代碼對其進行過濾。并且沒有輸出顯示
arr.map((item,idx) => (
console.log(item.data.games.gamename)
)
))
我想列印所有游戲名稱，例如。
板球 足球 電子游戲 排球
uj5u.com熱心網友回復：
我們可以用flatMap()它來做
const arr = [{
"status": "success",
"data": [{
"name": "user1",
"games": [{
"id": 1,
"gamename": "cricket"
}, {
"id": 2,
"gamename": "football"
}]
},
{
"name": "user1",
"games": [{
"id": 1,
"gamename": "videogames"
}, {
"id": 2,
"gamename": "volleyball"
}]
}
]
}]
// multiple flatMap chain invocation seems ugly,waiting for more elegant solution
let result = arr.flatMap(a => a.data).flatMap(a => a.games).flatMap(a => a.gamename)
console.log(result)uj5u.com熱心網友回復：
資料是陣列，游戲也是：
const arr = [
{
status: "success",
data: [
{
name: "user1",
games: [
{
id: 1,
gamename: "cricket",
},
{
id: 2,
gamename: "football",
},
],
},
{
name: "user1",
games: [
{
id: 1,
gamename: "videogames",
},
{
id: 2,
gamename: "volleyball",
},
],
},
],
},
];
arr.map((item) => {
item.data.map((item) => {
item.games.map((item) => {
console.log(item.gamename);
});
});
});
uj5u.com熱心網友回復：
試試這段代碼，它將只回傳游戲名稱，如果不需要逗號 (,)，您可以更改連接
輸出：“板球、足球、電子游戲、排球”
const arr = [{
"status": "success",
"data": [{
"name": "user1",
"games": [{
"id": 1,
"gamename": "cricket"
}, {
"id": 2,
"gamename": "football"
}]
},
{
"name": "user1",
"games": [{
"id": 1,
"gamename": "videogames"
}, {
"id": 2,
"gamename": "volleyball"
}]
}
]
}];
console.log(JSON.stringify(arr.filter(e=>e.status=="success").map(e=>e.data.map(f=>f.games.map(g=>g.gamename)).join(",")).join(",")));
轉載請註明出處，本文鏈接：https://www.uj5u.com/shujuku/535828.html