如何解决找到并从JavaScript中的数组中删除嵌套的元素? 您可以使用Javascript的forEach有效地做到这一点
我下面有一个json
[
{
"monthlyData": [
{
"dateYear": "2020-07","data": [
{
"id": "45bf4792-c5a5-44ed-b7e8-57557c4f30ee","date": "2020-07-13T00:00:00.000Z","transactionId": "160","amount": 70,"active": 1,"createdAt": "2020-07-14T02:55:43.988Z","updatedAt": "2020-08-14T02:55:43.988Z","version": 1
}
]
}
],"hashId": "4"
},{
"monthlyData": [
{
"dateYear": "2020-08","data": [
{
"id": "38fe3c68-e6aa-4c57-b4d7-dc6c4f597269","date": "2020-08-13T00:00:00.000Z","transactionId": "146","createdAt": "2020-08-14T02:55:43.988Z","hashId": "5"
}
]
我有一个数组,其中月份-年份的列表为
let datesArr = ['2020-08','2020-09','2020-10','2020-11','2020-07']
现在,我想从datesArr
中一个接一个地选择一个日期,并确定日期是否与整个JSON数组中的dateYear
列匹配。应该为这些日期匹配创建JSON数组的副本。我只想保留日期匹配的那些对象。
解决方法
您可以使用Javascript的forEach有效地做到这一点
下面的代码提取您所需的信息。
h = randn(64,1);
H = zeros(256,256);
for l= 1:256
for p = 1 : 256
if (l-p <= 64 && l-p >= 0)
H(l,p) = h(l-p);
end
end
end
具体取决于您希望它如何编译结果,这与您的问题并不矛盾,您应该能够根据需要进行调整。
没有您想要的输出示例,我们所能做的就是猜测您的意思。
,您可以使用 array.filter
let originalArray = [
{
"monthlyData": [
{
"dateYear": "2020-07","data": [
{
"id": "45bf4792-c5a5-44ed-b7e8-57557c4f30ee","date": "2020-07-13T00:00:00.000Z","transactionId": "160","amount": 70,"active": 1,"createdAt": "2020-07-14T02:55:43.988Z","updatedAt": "2020-08-14T02:55:43.988Z","version": 1
}
]
}
],"hashId": "4"
},{
"monthlyData": [
{
"dateYear": "2020-08","data": [
{
"id": "38fe3c68-e6aa-4c57-b4d7-dc6c4f597269","date": "2020-08-13T00:00:00.000Z","transactionId": "146","createdAt": "2020-08-14T02:55:43.988Z","hashId": "5"
}
];
let datesArr = ['2020-08','2020-09','2020-10','2020-11'];
let filtered = originalArray.filter(value => {
value.monthlyData = value.monthlyData.filter(md => {
return datesArr.includes(md.dateYear);
})
return value.monthlyData.length > 0;
})
console.log(JSON.stringify(filtered))
此示例将在下面显示此内容(如果您要这样做的话):
[
{
"monthlyData": [
{
"dateYear": "2020-08","data": [
{
"id": "38fe3c68-e6aa-4c57-b4d7-dc6c4f597269","version": 1
}
]
}
],"hashId": "5"
}
]
编辑日期对象比较
如果dateArr像
let datesArr = [new Date('2020-08'),new Date('2020-09')];
您可以在第二个过滤器内使用 array.some
let filtered = originalArray.filter(value => {
value.monthlyData = value.monthlyData.filter(md => {
return datesArr.some(value1 => value1.getTime() === new Date(md.dateYear).getTime());
})
return value.monthlyData.length > 0;
})
当然,如果原始数组也具有Date对象,则可以丢弃
new Date(md.dateYear).getTime()
改用md.dateYear.getTime()
编辑您的评论:
我需要将那些日期添加到与之不匹配的monthData中 dateArray,数据为空。我该怎么办。
您可以为此使用以下代码
let newArr = []
datesArr.forEach(date => {
let element = originalArray.find(value => {
value.monthlyData = value.monthlyData.filter(md => {
return date === md.dateYear;
})
return value.monthlyData.length > 0;
})
if (!element){
element = {
"monthlyData": [
{
"dateYear": date,"data": []
}
],"hashId": "something?"
}
}else {
// make a clone
element = JSON.parse(JSON.stringify(element))
}
newArr.push(element);
})
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