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Merging two arrays of objects Javascript / Typescript

I have two arrays of objects which looks something like this:
const users = [
{
status: 'failed',
actionName: 'blabla',
userId: 1,
},
{
status: 'success',
actionName: 'blablabla',
userId: 2,
},
];
Second one
const usersDetails = [
{
name: 'Joseph',
id: 1,
},
{
name: 'Andrew',
id: 2,
},
];
I want to check if userId is equal to id and if so then push the name from usersDetails into users objects. So output would look like this:
const users = [
{
status: 'failed',
actionName: 'blabla',
userId: 1,
name: 'Joseph'
},
{
status: 'success',
actionName: 'blablabla',
userId: 2,
name: 'Andrew'
}];

The easiest solution would be to do:
const users = [
{
status: 'failed',
actionName: 'blabla',
userId: 1,
},
{
status: 'success',
actionName: 'blablabla',
userId: 2,
},
];
const usersDetails = [
{
name: 'Joseph',
id: 1,
},
{
name: 'Andrew',
id: 2,
},
];
const getAllUserInfo = () => users.map(user => {
const userExtraInfo = usersDetails.find(details => details.id === user.userId)
const fullUser = {...user, ...userExtraInfo}
delete fullUser.id
return fullUser
})
console.log(getAllUserInfo())

const users = [ { status: 'failed', actionName: 'blabla', userId: 1, }, { status: 'success', actionName: 'blablabla', userId: 2, }, ];
const usersDetails = [ { name: 'Joseph', id: 1, }, { name: 'Andrew', id: 2, }, ];
const newUsers = users.map(user => {
user.name = usersDetails.find(u => u.id === user.userId)?.name;
return user;
});
console.log(newUsers);

You can try this code :
let result = users.map(user => ({...user, ...usersDetails.find(userDetail => userDetail.id == user.userId) }));
console.log(result);
If you only want to get name from the second array :
let result = users.map(user => ({...user, 'name': usersDetails.find(userDetail => userDetail.id == user.userId).name }));
If you want to get all properties exepted id ::
let result = users.map(user => {
let result = {...user, ...usersDetails.find(userDetail => userDetail.id == user.userId) }
delete result.id;
return result;
});

Hope this answer will work for you
const users = [
{
status: "failed",
actionName: "blabla",
userId: 1,
},
{
status: "success",
actionName: "blablabla",
userId: 2,
},
];
const usersDetails = [
{
name: "Joseph",
id: 1,
},
{
name: "Andrew",
id: 2,
},
];
users.map((e) => {
usersDetails.find((_e) => {
if (e.userId === _e.id) {
e.name = _e.name;
}
});
});
console.log(users);

you can do something like this using a single loop
const users = [
{
status: "failed",
actionName: "blabla",
userId: 1,
},
{
status: "success",
actionName: "blablabla",
userId: 2,
},
];
const usersDetails = [
{
name: "Joseph",
id: 1,
},
{
name: "Andrew",
id: 2,
},
];
const result = Object.values([...users, ...usersDetails].reduce((res, {userId, id,...item}) => {
const key = id || userId
return {
...res,
[key]: {...(res[key] || {userId: key}), ...item}
}
}, {}))
console.log(result);

const users = [{
status: 'failed',
actionName: 'blabla',
userId: 1,
},
{
status: 'success',
actionName: 'blablabla',
userId: 2,
},
];
const usersDetails = [{
name: 'Joseph',
id: 1,
},
{
name: 'Andrew',
id: 2,
},
];
users.forEach(each => {
const found = usersDetails.find(detail => detail.id === each.userId);
if (found) {
each.name = found.name;
}
});
console.log(users);

How to sum each value inside array of object to new variable

I have a data like this :
const fund =
[
{
id: 1234,
totalAmount: 0,
data:
[
{
id: 1234,
amount: '4.000'
},
{
id: 1234,
amount: '3.000'
}
]
},
{
id: 12345,
totalAmount: 0
},
{
id: 123456,
totalAmount: 0
data:
[
{
id: 123456,
amount: '3.000'
},
{
id: 123456,
amount: '5.000'
}
]
}
]
I want to sum the amount inside of data each id to a key called totalAmount. But not all the parent id have data key.
here's my desired output :
const fund =
[
{
id: 1234
data:
[
{
id: 1234,
amount: '4.000'
},
{
id: 1234,
amount: '3.000'
}
],
totalAmount: 7000
},
{
id: 12345,
totalAmount: 0
},
{
id: 123456,
data:
[
{
id: 123456,
amount: '3.000'
},
{
id: 123456,
amount: '5.000'
}
],
totalAmount: 8000
}
]
I was trying with this code :
fund.forEach((elA, i) => {
if (elA.data) {
const total = funders[i].data.reduce((acc, curr) => {
acc += parseInt(curr.amount.replace(/\./g, ''))
return acc
})
fund[i] = total ? {...elA, totalAmount: total} : elA;
}
})
But it's not summing like i want.
Where's my mistake ?
Please ask me if you need more information if it's still not enough to solve that case.

You need to define the initial value for the reduce iterator.
fund.forEach((elA, i) => {
if (elA.data) {
const total = funders[i].data.reduce((acc, curr) => {
acc += parseInt(curr.amount.replace(/\./g, ''))
return acc
}, 0)
fund[i] = total ? {...elA, totalAmount: total} : elA;
}
});
Another alternative for the same code:
fund.forEach(elA => {
if (elA.data) {
const total = elA.data.reduce((acc, curr) => {
return acc + parseInt(curr.amount.replace(/\./g, ''))
}, 0)
elA.totalAmount = total;
}
});

return the value of the matching items in an array

I have two arrays that I would like to compare and return a respective value of the ones that match.
Taking the 'id' variable as a reference, I want to return all the matching values of fastFood, but only the 'name'.
My expected result is to return Five Guys and KFC, but instead, it returns the entire object.
let id = ['1234'];
let fastFood = [
{_id:'4391', name: "McDonalds"},
{_id:'7654', name: "Burger King"},
{_id:'8765', name: "Dominos"},
{_id:'1234', name: "Five Guys"},
{_id:'9876', name: "Subway"},
{_id:'1234', name: "KFC"}
];
const findFastFood = ids.filter((item) => {
if (item._id.indexOf(id) !== -1) {
return item.name;
}
});
console.log(findFastFood);

Does this help?
let id = ['1234'];
let fastFood = [{
_id: '4391',
name: "McDonalds"
},
{
_id: '7654',
name: "Burger King"
},
{
_id: '8765',
name: "Dominos"
},
{
_id: '1234',
name: "Five Guys"
},
{
_id: '9876',
name: "Subway"
},
{
_id: '1234',
name: "KFC"
}
];
const findFastFood = fastFood.filter((item) => {
if (id.indexOf(item._id) !== -1) {
return item.name
}
}).map(obj => obj.name);
console.log(findFastFood);

How to Group JavaScript Array of Object based on key

So I have a data like this
const carts = [
{
name: 'Voucher A',
participants: [
{
date: 112
},
{
date: 112
}
],
supplierName: 'ABC',
ticketDescription: 'Description of',
...data
},
{
name: 'Voucher B',
participants: [
{
date: 111
},
{
date: 112
}
],
supplierName: 'ABC',
ticketDescription: 'Description of',
...data
}
]
And I want to group it based on the date (if it has same date). So for data above, the expected result will be
expected = [
{
name: 'Voucher A',
date: 1,
count: 1,
supplierName: 'ABC',
ticketDescription: 'Description of',
...data
},
{
name: 'Voucher A',
date: 2,
count: 1,
supplierName: 'ABC',
ticketDescription: 'Description of',
...data
}
]
Because it has different date. But if it has same date, the expected result will be
expected = [
{
name: 'Voucher A',
date: 1,
count: 2,
supplierName: 'ABC',
ticketDescription: 'Description of',
...data
}
]
I was trying to use reduce to group it but it did not give the structure I want
carts.forEach(cart => {
cart.participants.reduce((acc, obj) => {
acc[obj.date] = [...acc[obj.date] || [], obj]
return acc
}, {})
})

To organize the data, I think you need two associations to group by: the name and the dates and their counts for that name:
const carts = [
{
name: 'Voucher A',
participants: [
{
date: 1
},
{
date: 2
}
]
}
];
const groupedByNames = {};
for (const { name, participants } of carts) {
if (!groupedByNames[name]) groupedByNames[name] = {};
for (const { date } of participants) {
groupedByNames[name][date] = (groupedByNames[name][date] || 0) + 1;
}
}
const output = Object.entries(groupedByNames).flatMap(
([name, dateCounts]) => Object.entries(dateCounts).map(
([date, count]) => ({ name, date: Number(date), count })
)
);
console.log(output);

If you want use, just plain for loops, you can try this solution. It looks simple and elegant 😜😜
const carts = [
{
name: 'Voucher A',
participants: [
{
date: 1
},
{
date: 1
},
{
date: 2
}
]
},
{
name: 'Voucher B',
participants: [
{
date: 1
},
{
date: 2
},
{
date: 2
}
]
}
]
const finalOutput = []
for (const cart of carts) {
for (const participant of cart.participants) {
const res = finalOutput.find(e => e.name === cart.name && e.date === participant.date)
if (res) {
res.count += 1
} else {
finalOutput.push({ name: cart.name, date: participant.date, count: 1 })
}
}
}
console.log(finalOutput)

Use forEach and destructuring
const process = ({ participants, name }) => {
const res = {};
participants.forEach(({ date }) => {
res[date] ??= { name, count: 0, date };
res[date].count += 1;
});
return Object.values(res);
};
const carts = [
{
name: "Voucher A",
participants: [
{
date: 1,
},
{
date: 2,
},
],
},
];
console.log(carts.flatMap(process));
const carts2 = [
{
name: "Voucher A",
participants: [
{
date: 1,
},
{
date: 1,
},
],
},
];
console.log(carts2.flatMap(process));

Filter array inside array

I have the array as below
test_list = [
{
id: 1,
test_name: 'Test 1',
members: [
{
user_id: 3
},
{
user_id: 4
}
],
},
{
id: 2,
test_name: 'Test 2',
members: [
{
user_id: 4
},
{
user_id: 5
},
],
},
{
id: 3,
test_name: 'Test 2',
members: [
{
user_id: 8
},
{
user_id: 10
},
],
}
]
I want to filter the test for specific user_id, example if user_id = 4 I would like to have this result
{
id: 1,
...
},
{
id: 2,
...
},
I have tried with this but it only return the member
test_list.filter(function(item) {
item.members.filter(function(member) {
if(member.user_id === 4) {
return item;
}
});
})
Would anyone please help me in this case?

Check if .some of the objects in the members array have the user_id you're looking for:
test_list = [{
id: 1,
test_name: 'Test 1',
members: [{
user_id: 3
},
{
user_id: 4
}
],
},
{
id: 2,
test_name: 'Test 2',
members: [{
user_id: 4
},
{
user_id: 5
},
],
},
{
id: 3,
test_name: 'Test 2',
members: [{
user_id: 8
}]
}
];
const filtered = test_list.filter(
({ members }) => members.some(
({ user_id }) => user_id === 4
)
);
console.log(filtered);

You could use .reduce() and .filter() method of array to achieve required result.
Please check below working code snippet:
const arr = [{"id":1,"test_name":"Test 1","members":[{"user_id":3},{"user_id":4}]},{"id":2,"test_name":"Test 2","members":[{"user_id":4},{"user_id":5}]},{"id":3,"test_name":"Test 2","members":[{"user_id":8}]}];
const data = arr.reduce((r,{ members,...rest }) => {
let rec = members.filter(o => o.user_id === 4)
if(rec.length){
rest.members = rec;
r.push(rest);
}
return r;
},[]);
console.log(data);

Hope this works.
var members = item.members;
var filterById =members.filter((item1)=>{
return (item1.user_id===4)
});
return filterById.length > 0;
});
console.log(test_List_by_id)```