我的代码按预期工作，但我很难在我的数据中找到并添加earliest_date，next_date和latest_date。
let tasks_data = [
{
'id': 10376401,
'name': 'closed',
'notes': null,
'start_date': '2017-12-23',
'end_date': '2018-01-07',
'start_time': null,
'end_time': null,
'color': '#f99bd0',
'color_id': 5,
'estimated_hours': 0,
'done': false,
'user_id': 961775,
'project_id': null,
'project': null,
'folder_id': null,
'weight': 0,
'created_at': '2017-11-13T00:58:16.577+00:00',
'updated_at': '2017-11-13T00:58:16.577+00:00',
'deleted_at': null
},
{
'id': 10438883,
'name': '',
'notes': null,
'start_date': '2018-02-17',
'end_date': '2018-02-17',
'start_time': null,
'end_time': null,
'color': '#ccaf53',
'color_id': 36,
'estimated_hours': 0,
'done': false,
'user_id': 961775,
'project_id': 1501267,
'project': {
'id': 1501267,
'name': 'sue',
'color': '#ccaf53',
'color_id': 36,
'client': null,
'created_at': '2017-11-17T03:14:11.459+00:00',
'updated_at': '2017-11-17T03:14:11.459+00:00'
},
'folder_id': null,
'weight': 0,
'created_at': '2017-11-17T03:15:48.055+00:00',
'updated_at': '2017-11-17T03:15:48.055+00:00',
'deleted_at': null
},
{
'id': 10438875,
'name': 'Sue',
'notes': null,
'start_date': '2018-01-27',
'end_date': '2018-01-27',
'start_time': null,
'end_time': null,
'color': '#ccaf53',
'color_id': 36,
'estimated_hours': 0,
'done': false,
'user_id': 961775,
'project_id': 1501267,
'project': {
'id': 1501267,
'name': 'sue',
'color': '#ccaf53',
'color_id': 36,
'client': null,
'created_at': '2017-11-17T03:14:11.459+00:00',
'updated_at': '2017-11-17T03:14:11.459+00:00'
},
'folder_id': null,
'weight': 0,
'created_at': '2017-11-17T03:14:11.903+00:00',
'updated_at': '2017-11-17T03:14:50.363+00:00',
'deleted_at': null
}
]
var start_dates = new Array()
var end_dates = new Array()
var result = tasks_data.reduce(function (acc, item) {
var task = acc.find(function (accItem) {
return accItem.project_id == item.project_id
})
if (task && !Array.isArray(task.schedule)) {
task.schedule = [task.schedule].concat({
project_id: item.project_id,
start_date: item.start_date,
end_date: item.end_date,
daily_estimate: item.estimated_hours,
})
task.start_dates.push(item.start_date)
task.end_dates.push(item.end_date)
task.next_start_dates.push(item.start_date)
} else if (task && Array.isArray(task.schedule)) {
task.schedule.push({
project_id: item.project_id,
start_date: item.start_date,
end_date: item.end_date,
daily_estimate: item.estimated_hours,
})
task.start_dates.push(item.start_date)
task.end_dates.push(item.end_date)
task.next_start_dates.push(item.start_date)
} else {
acc.push({
project_id: item.project_id,
schedule: {
project_id: item.project_id,
start_date: item.start_date,
end_date: item.end_date,
daily_estimate: item.estimated_hours,
},
start_dates: [item.start_date],
end_dates: [item.end_date],
next_start_dates: [item.start_date],
})
}
return acc
}, [])
console.log(result) // I got the dates stored in an array. I will now use the final result to parse it and get the earliest, latest and next_start date. Don't know how to simplify it.
function getEarliest (array_dates) {
return array_dates.reduce(function (pre, cur) {
return Date.parse(pre) > Date.parse(cur) ? cur : pre
})
}<body>
<h1>Hello, World!</h1>
<p>Welcome to <strong>Foo</strong>.</p>
</body>
“最早”是start_date，最新的是end_date，而next_start也是start_date，不包括查询的“最早”。
我的预期输出是：
[
{
"project_id": null,
"schedule": {
"project_id": null,
"start_date": "2017-12-23",
"end_date": "2018-01-07",
"daily_estimate": 0
},
earliest: "2017-12-23",
latest: "2018-01-07",
next_start: "2017-12-23"
},
{
"project_id": 1501267,
"schedule": [
{
"project_id": 1501267,
"start_date": "2018-02-17",
"end_date": "2018-02-17",
"daily_estimate": 0
},
{
"project_id": 1501267,
"start_date": "2018-01-27",
"end_date": "2018-01-27",
"daily_estimate": 0
}
],
earliest: "2018-01-27",
latest: "2018-02-17",
next_start: "2018-02-17"
}
]