i got this type of array, and i want to group by only one column (first_name) from whole array,
[
{
first_name: "Apurv",
date: "2018-01-22",
is_present: "1",
}
{
first_name: "Lucky",
date: "2018-01-22",
is_present: "0",
}
{
first_name: "Apurv",
date: "2018-01-20",
is_present: "0",
}
{
first_name: "Lucky",
date: "2018-01-20",
is_present: "1",
}
]
so how can i group by this array from "component"?
var data = [
{
first_name: "Apurv",
date: "2018-01-22",
is_present: "1",
},
{
first_name: "Lucky",
date: "2018-01-22",
is_present: "0",
},
{
first_name: "Apurv",
date: "2018-01-20",
is_present: "0",
},
{
first_name: "Lucky",
date: "2018-01-20",
is_present: "1",
}
];
var groupByName = {};
data.forEach(function (a) {
groupByName [a.first_name] = groupByName [a.first_name] || [];
groupByName [a.first_name].push({ date: a.date, is_present: a.is_present });
});
console.log(groupByName);
Related
I have a collection Shops. Each object in Shops collection has an array of Item objects called items.
{
_id: ObjectId(...),
shopName: 'Ice cream Shop',
items: [
<Item>{
itemName: 'Chocolate IC',
availabilities: [
{
city: 'NY',
arrivals: [
{
price: 3.99,
quantityLeft: 0,
date: 'yesterday'
},
{
price: 3.99,
quantityLeft: 40,
date: 'today'
}
]
},
{
city: 'LA',
arrivals: []
}
]
},
<Item>{
itemName: 'Strawberry IC',
availabilities: [
{
city: 'NY',
arrivals: [
{
price: 3.99,
quantityLeft: 0,
date: 'yesterday'
},
]
}
]
},
],
},
... anotherShops
I want to get list of Item objects which has overall quantityLeft more than 0 from a specific shop.
I tried this code to get all items with the name start with "Straw" from a Shop with shopName equal to 'Ice cream Shop':
const items = await Shop.aggregate()
.match({
shopName: 'Ice cream Shop',
})
.project({
items: {
$filter: {
input: "$items",
as: "item",
cond: {
$regexMatch: {
input: "$$item.itemName",
regex: `.*Straw.*`,
},
},
},
},
});
And it works. But I don't know how to sum up all quantityLeft values inside availabilities array of each item, and return only that items that has sum more than 0.
availabilities array can be an empty array [].
The city parameter also needs to be in condition. For example, only Items that are in stock in NY
I need this to get the list of items from a certain shop, and only the items that are still in stock.
Pretty hard.
I came up with this solution. If you have a better solution, please post it.
const shop = await GCShop.aggregate([
{
$match: {
shopName: 'Ice Cream Shop',
},
},
{
$unwind: "$items",
},
{
$unwind: "$items.availabilities",
},
{
$unwind: "$items.availabilities.arrivals",
},
{
$group: {
_id: "$items.id",
items_name: { $first: "$items.name" },
arrivals: {
$push: {
arrival_id: "$items.availabilities.arrivals.arrival_id",
price: "$items.availabilities.arrivals.price",
qtty: "$items.availabilities.arrivals.qtty",
},
},
totalQtty: { $sum: "$items.availabilities.arrivals.qtty" },
},
},
{
$project: {
offer_id: "$_id",
_id: 0,
offer_name: 1,
totalQtty: 1,
arrivals: 1,
},
},
{
$match: {
totalQtty: {
$gt: 0,
},
},
},
]).limit(20);
How can I sort and group objects alphabetically by the first letter from an array in angular? I have seen the example to do this Sort and group objects alphabetically in Javascript and the exact answer and output json i am looking in Angular.
As of now My api json is like this stackblitz
Expexted api json would like this stackblitz
I have tried this but i am unable to found the solution in angular.
real Json:
employees = [
{ name: "Abigail", age: "25" },
{ name: "Axle", age: "29" },
{ name: "Brianna", age: "25" },
{ name: "Brooklyn", age: "23" },
{ name: "Camila", age: "24" },
{ name: "Charlotte", age: "28" },
{ name: "David", age: "22" }
];
expecting json after sort and group objects alphabetically by the first letter from an array would like:
[
{
"alphabet": "A",
"record": [
{ "name": "Abigail", "age": "25" },
{ "name": "Axle", "age": "29" }
]
},
{
"alphabet": "B",
"record": [
{ "name": "Brianna", "age": "25" },
{ "name": "Brooklyn", "age": "23" }
]
},
{
"alphabet": "C",
"record": [
{ "name": "Camila", "age": "24" },
{ "name": "Charlotte", "age": "28" }
]
},
{
"alphabet": "D", "record": [
{ "name": "David", "age": "22" }
]
}
]
expected output like:
A
Abigail
Axle
B
Brianna
Brooklyn
C
Camila
Charlotte
D
David
As mentioned in the comment, there is no Typescript specific way to sort and group the data. You could the JS Array#reduce to group the objects to your requirement.
Try the following
const employees = [ { name: "Abigail", age: "25" }, { name: "Axle", age: "29" }, { name: "Brianna", age: "25" }, { name: "Brooklyn", age: "23" }, { name: "Camila", age: "24" }, { name: "Charlotte", age: "28" }, { name: "David", age: "22" } ];
const output = employees
.reduce((acc, curr) => {
const idx = acc.findIndex(e => e.alphabet === curr.name[0]);
if (idx === -1) {
acc.push({ alphabet: curr.name[0], record: [curr] });
}
else {
acc[idx].record.push(curr);
acc[idx].record.sort((r1, r2) => r1.name > r2.name ? 1 : -1);
}
return acc;
}, [])
.sort((e1, e2) => e1.alphabet > e2.alphabet ? 1 : -1);
console.log(output);
It would look like following in the Stackblitz.
export class ExpansionOverviewExample {
#ViewChild(MatAccordion, { static: false }) accordion: MatAccordion;
employees = [
{ name: "Brianna", age: "25" },
{ name: "Axle", age: "29" },
{ name: "David", age: "22" },
{ name: "Brooklyn", age: "23" },
{ name: "Camila", age: "24" },
{ name: "Abigail", age: "25" },
{ name: "Charlotte", age: "28" }
];
constructor() {
this.employees = this.employees
.reduce((acc, curr) => {
const idx = acc.findIndex(e => e.alphabet === curr.name[0]);
if (idx === -1) {
acc.push({ alphabet: curr.name[0], record: [curr] });
} else {
acc[idx].record.push(curr);
acc[idx].record.sort((r1, r2) => (r1.name > r2.name ? 1 : -1));
}
return acc;
}, [])
.sort((e1, e2) => (e1.alphabet > e2.alphabet ? 1 : -1));
}
}
You could also use safe navigation operator ?. in the template so you don't get any undefined errors before the reduce is complete.
<div *ngFor="let mani of employees">
<div>
<p>{{mani?.alphabet}}</p>
<p *ngFor="let group of mani?.record"> {{ group?.name }}</p>
<hr>
</div>
</div>
I've updated your Stackblitz
I have a sorted array
let things = [
Thing(activity: "1", name: "value1"),
Thing(activity: "1", name: "value2"),
Thing(activity: "1", name: "value3"),
Thing(activity: "2", name: "value4"),
Thing(activity: "2", name: "value5"),
Thing(activity: "3", name: "value6"),
Thing(activity: "3", name: "value7"),
Thing(activity: "1", name: "value8"),
Thing(activity: "1", name: "value9"),
Thing(activity: "1", name: "value10")
]
I would like to produce array of arrays splitted when the activity value changes similar to the following
[[Thing(activity: "1", name: "value1"),
Thing(activity: "1", name: "value2"),
Thing(activity: "1", name: "value3")],
[Thing(activity: "2", name: "value4"),
Thing(activity: "2", name: "value5")],
[Thing(activity: "3", name: "value6"),
Thing(activity: "3", name: "value7")],
[Thing(activity: "1", name: "value8"),
Thing(activity: "1", name: "value9"),
Thing(activity: "1", name: "value10")]]
A generalized solution would be:
extension Sequence {
func grouped<T: Equatable>(by block: (Element) throws -> T) rethrows -> [[Element]] {
return try reduce(into: []) { result, element in
if let lastElement = result.last?.last, try block(lastElement) == block(element) {
result[result.index(before: result.endIndex)].append(element)
} else {
result.append([element])
}
}
}
}
Then you can do:
let results = things.grouped { $0.activity }
A less elegant (but slightly more efficient) solution would be:
extension Sequence {
func grouped<T: Equatable>(by block: (Element) throws -> T) rethrows -> [[Element]] {
var results: [[Element]] = []
var lastValue: T?
var index = results.endIndex
for element in self {
let value = try block(element)
if let lastValue = lastValue, lastValue == value {
results[index].append(element)
} else {
results.append([element])
index = results.index(before: results.endIndex)
lastValue = value
}
}
return results
}
}
As already mentioned by #matt in comments you can use collection method reduce(into:) to group your elements by checking if the activity of the last element of the last array is equal to the current element activity, if so just append a new element to the last array, otherwise append a new array with a single element to the outer array:
struct Thing {
let activity, name: String
}
let things: [Thing] = [
.init(activity: "1", name: "value1"),
.init(activity: "1", name: "value2"),
.init(activity: "1", name: "value3"),
.init(activity: "2", name: "value4"),
.init(activity: "2", name: "value5"),
.init(activity: "3", name: "value6"),
.init(activity: "3", name: "value7"),
.init(activity: "1", name: "value8"),
.init(activity: "1", name: "value9"),
.init(activity: "1", name: "value10")]
let grouped: [[Thing]] = things.reduce(into: []) {
$0.last?.last?.activity == $1.activity ?
$0[$0.index(before: $0.endIndex)].append($1) :
$0.append([$1])
}
print(grouped) // "[[__lldb_expr_1.Thing(activity: "1", name: "value1"), __lldb_expr_1.Thing(activity: "1", name: "value2"), __lldb_expr_1.Thing(activity: "1", name: "value3")], [__lldb_expr_1.Thing(activity: "2", name: "value4"), __lldb_expr_1.Thing(activity: "2", name: "value5")], [__lldb_expr_1.Thing(activity: "3", name: "value6"), __lldb_expr_1.Thing(activity: "3", name: "value7")], [__lldb_expr_1.Thing(activity: "1", name: "value8"), __lldb_expr_1.Thing(activity: "1", name: "value9"), __lldb_expr_1.Thing(activity: "1", name: "value10")]]\n"
i want to grouping data JSON (One JSON) base on region. and the json after grouping like in (Two JSON). and i use the two JSON for show data (Result JSON). so, how to add loop base on region after grouping, because actually i want to show data in front end like (Result JSON):
==>One JSON
data:[
{id:1,
status: "active",
dataDetail: {
id: 5,
name: tes 1,
region: aaa,
}
},
{id:2,
status: "active",
dataDetail: {
id: 8,
name: tes 2,
region: bbb,
}
},
{id:3,
status: "active",
dataDetail: {
id: 8,
name: tes 3,
region: aaa,
}
}
]
==> Two JSON
aaa: [
{id:1,
status: "active",
dataDetail: {
id: 5,
name: tes 1,
region: aaa,
}
},
{id:3,
status: "active",
dataDetail: {
id: 8,
name: tes 3,
region: aaa,
}
}
],
bbb: [
{id:2,
status: "active",
dataDetail: {
id: 8,
name: tes 2,
region: bbb,
}
},
]
==> Result JSON
aaa:
1
3
bbb:
2
thanks
Using Lodash:
const jsonTwo = _.groupBy(data, instance => instance.dataDetail.region);
const resultJson = _.mapValues(jsonTwo, regionInstances => regionInstances.map(instance => instance.id));
Using plain javascript reduce functions:
const jsonTwo = data.reduce((accumulator, instance) => {
if(!accumulator[instance.dataDetail.region]) {
accumulator[instance.dataDetail.region] = [];
}
accumulator[instance.dataDetail.region].push(instance)
return accumulator;
},{});
const resultJson = data.reduce((accumulator, instance) => {
if(!accumulator[instance.dataDetail.region]) {
accumulator[instance.dataDetail.region] = [];
}
accumulator[instance.dataDetail.region].push(instance.id)
return accumulator;
},{});
var data =
[
{
"id": 1,
"status": "active",
"dataDetail": {
"id": 5,
"name": "tes 1",
"region": "aaa"
}
},
{
"id": 2,
"status": "active",
"dataDetail": {
"id": 8,
"name": "tes 2",
"region": "bbb"
}
},
{
"id": 3,
"status": "active",
"dataDetail": {
"id": 8,
"name": "tes 3",
"region": "aaa"
}
}
];
groups =_.chain(data).groupBy('dataDetail.region');
keys = groups.map( (value, key) => key);
values = groups.map( (value, key) => _.map(value, 'id'));
result = _.zipObject(keys, values);
I have a function that returns an array of objects data.sportdata. I would like to get all array elements with the same sports_id. The code
$scope.arrSportData = data.sportdata;
angular.forEach($scope.arrSportData, function(value, key) {
console.log($scope.arrSportData);
//getting reponse
/*
Object { id: "1", user_id: "2", sport_id: "1", position_id: "1", team_name: "JimmyTmname",}
Object { id: "2", user_id: "2", sport_id: "2", position_id: "6", team_name: "JimmyTmname2",}
Object { id: "3", user_id: "2", sport_id: "3", position_id: "12", team_name: "JimmyTmname3",}
Object { id: "4", user_id: "2", sport_id: "5", position_id: "20", team_name: "JimmyTmname5",}
*/
//code i wrote
if (value.sport_id == 1) {
$scope.positionId.spr1 = value.position_id;
$scope.teamname.spr1 = value.team_name;
}
if (value.sport_id == 2) {
$scope.positionId.spr2 = value.position_id;
$scope.teamname.spr2 = value.team_name;
}
if (value.sport_id == 3) {
$scope.positionId.spr3 = value.position_id;
$scope.teamname.spr3 = value.team_name;
}
if (value.sport_id == 4) {
$scope.positionId.spr4 = value.position_id;
$scope.teamname.spr4 = value.team_name;
}
});
Here I am always getting first value and nothing more. Please suggest and help to solve this problem.
I did try outside of the loop but does not work. I think filter function can do this but dont know how does it work.
Perform a groupBy function which will give you an object like this
{
key: [],
key: []
}
Here the key will be sport_id and [] will be the items with the same key.
A minimal working example will be,
// Written By: Ceaser Bautista
//Link: http://stackoverflow.com/a/34890276/17447
var groupBy = function(xs, key) {
return xs.reduce(function(rv, x) {
(rv[x[key]] = rv[x[key]] || []).push(x);
return rv;
}, {});
};
//here we have four teams with two sports id 13 and 22
var arrSportData = [{
id: "1",
user_id: "1",
sport_id: "13",
position_id: "1",
team_name: "JimmyTmname"
}, {
id: "2",
user_id: "2",
sport_id: "22",
position_id: "6",
team_name: "JimmyTmname2"
}, {
id: "3",
user_id: "3",
sport_id: "22",
position_id: "12",
team_name: "JimmyTmname2",
}, {
id: "4",
user_id: "4",
sport_id: "13",
position_id: "20",
team_name: "JimmyTmname1"
}];
$scope.groupedData = groupBy(arrSportData, "sport_id");
console.log(groupedData);
Now you will have an array for each sports_id. In view populate it like
<div ng-repeat="(key, items) in groupedData">
<h4>Sports ID: {{key}}</h4>
<ul ng-repeat="item in items">
<li>User ID: {{item.user_id}}</li>
</ul>
</div>