[英]Normal Mapping vs Reduce
I'm trying to convert an object into single array with just key and value.我正在尝试将一个对象转换为只有键和值的单个数组。 I tried two different ways.
我尝试了两种不同的方法。 Though I succeeded in my first attempt but using reduce I am unable to get the result.
虽然我在第一次尝试中成功了,但使用 reduce 却无法得到结果。 Please kindly let me know if there is/are better ways of achieving the same.
请让我知道是否有更好的方法来实现相同的目标。 Thank you.
谢谢你。
var demoArr = [
{
"results": [
{
"listing_id": 10544193
},
{
"listing_id": 4535435
}
],
"results1": [
{
"listing_id": 1054419363
},
{
"listing_id": 432535435
}
]
}
];
let aaa = [];
// demoArr.map(x => { (before)
demoArr.forEach(x => { //(after)
let ss = Object.values(x);
// ss.map(y => { (before)
ss.forEach(y => { //(after)
y.forEach(k => {
aaa.push({"listing_id" : k.listing_id});
})
});
});
Resulted in the following.结果如下。
[{"listing_id":10544193},{"listing_id":4535435},{"listing_id":1054419363},{"listing_id":432535435}]
Is there a better way to achieve the above?有没有更好的方法来实现上述目标? Maybe by using reduce?
也许通过使用减少? I tried but failed to get the result.
我试过但没有得到结果。
var ds = demoArr.reduce((a,value) => {
a[value.listing_id] = a[value.listing_id] ? a[value.listing_id] : value
return a
},{});
Here's one way use flatMap()
and Object.values
, then flatten the result.这是使用
flatMap()
和Object.values
的一种方法,然后展平结果。 Using Object.values as an argument in this fashion is a shorthand for applying the map argument directly into the Object.values method and returning the result以这种方式使用 Object.values 作为参数是将 map 参数直接应用到 Object.values 方法并返回结果的简写
var demoArr = [{ "results": [{ "listing_id": 10544193 }, { "listing_id": 4535435 } ], "results1": [{ "listing_id": 1054419363 }, { "listing_id": 432535435 } ] }]; let output = demoArr.flatMap(Object.values).flat(); console.log(output)
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