[
{ name: 'Joe', scores: [1, 2, 3] },
{ name: 'Jane', scores: [1, 2, 3] },
{ name: 'John', scores: [1, 2, 3] }
]
how do I make a function that sorts the elements first by the sum in scores and later by name?
-
4What have you tried so far?Majed Badawi– Majed Badawi2022-02-27 17:23:29 +00:00Commented Feb 27, 2022 at 17:23
-
using the index of the list to get into the first aray and then tried to applya an indexnikstreat– nikstreat2022-02-27 17:29:53 +00:00Commented Feb 27, 2022 at 17:29
-
and then i tried two for loops one to select the first aray and then get in the secondnikstreat– nikstreat2022-02-27 17:30:48 +00:00Commented Feb 27, 2022 at 17:30
-
@nikstreat You will be able to get much better answers on here if you include the code that you tried to get working :)Jack Gore– Jack Gore2022-02-27 17:30:59 +00:00Commented Feb 27, 2022 at 17:30
-
when i googled i saw that this kind of stuff i tried is just not an option. Im looking for a way to be able ro reach scores so theat i can manipulate it but all i find is selekting an aray by thr value of the second itemnikstreat– nikstreat2022-02-27 17:34:05 +00:00Commented Feb 27, 2022 at 17:34
|
Show 3 more comments
3 Answers
Using Array#sort, sort the array by the sum of scores, or name as fallback (using String#localeCompare)
const arr = [ { name: 'Joe', scores: [1] }, { name: 'Jane', scores: [1, 2] }, { name: 'John', scores: [1, 2] } ];
const sum = (arr = []) => arr.reduce((total, num) => total + num, 0);
const sorted = arr.sort((a, b) =>
sum(b.scores) - sum(a.scores) || a.name.localeCompare(b.name)
);
console.log(sorted);Comments
You could take a Map for all sums and the object as key without mutating data.
const
data = [{ name: 'Joe', scores: [1, 2, 3] }, { name: 'Jane', scores: [1, 4, 3] }, { name: 'John', scores: [1, 2, 1] }],
add = (a, b) => a + b,
sums = new Map(data.map(o => [o, o.scores.reduce(add, 0)]));
data.sort((a, b) => sums.get(b) - sums.get(a) || a.name.localeCompare(b.name));
console.log(data);.as-console-wrapper { max-height: 100% !important; top: 0; }
Comments
The lodash package could be handy
const lodash = require('lodash')
const list = [
{ name: 'Joe', scores: [1, 2, 4] },
{ name: 'Jane', scores: [1, 2, 3] },
{ name: 'John', scores: [1, 2, 4] }
]
const listWithSum = list.map(item => {
return {
...item,
sum: lodash.sum(item.scores)
}
})
const sortedList = lodash.orderBy(listWithSum, ['score', 'name'], ['desc', 'desc'])
console.log(sortedList)
