[英]How to filter array and create new array with specific object keys
I have an array with objects and in each object there is an "items" array.我有一个包含对象的数组,并且在每个对象中都有一个“项目”数组。 My goal is to combine these "items" into one array.
我的目标是将这些“项目”组合成一个数组。
Goal / Expected Output目标/预期产出
[
{ id: 'SUV' },
{ id: 'Compact' },
{ id: 'Gasoline' },
{ id: 'Hybrid' }
]
Sample Array样本数组
[
{
"id":"carType",
"items":[
{
"id":"SUV"
},
{
"id":"Compact"
}
]
},
{
"id":"fuelType",
"items":[
{
"id":"Gasoline"
},
{
"id":"Hybrid"
}
]
}
]
You could use Array#flatMap
.你可以使用
Array#flatMap
。
const data = [{"id":"carType","items":[{"id":"SUV"},{"id":"Compact"}]},{"id":"fuelType","items":[{"id":"Gasoline"},{"id":"Hybrid"}]}]; const r = data.flatMap(({ items }) => items); console.log(r);
vanilla JS 中的单行(早于 EMCAScript 2019,flatMap 不可用,所以在这种情况下......)
[].concat(...arr.map(elt => elt.items))
Something like this?像这样的东西?
newArr = []
for (let i = 0;i<arr.length;i++) {
for (let ii = 0;ii<arr[i].items.length;ii++) {
newArr.push(arr[i].items[ii].id)
}
}
console.log(newArr)
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