sort array of arrays in specific order using lodash

Question

I want to sort an array of arrays based on:

Parameter given manually
Then sorted by DESC

Here is the array

var ar = [
    [{'name' : 'b', 'val' : '1'}, {'name' : 'b', 'val' : '10'}], // 'name' are always the same
    [{'name' : 'a', 'val' : '2'}, {'name' : 'a', 'val' : '2'}],
    [{'name' : 'c'}, {'name' : 'c', 'val' : '100'}]
]

When the sorting function is executed: sortBy('a')

It should return me:

var ar = [
    [{'name' : 'a', 'val' : '2'}, {'name' : 'a', 'val' : '2'}], 
    [{'name' : 'c'}, {'name' : 'c', 'val' : '100'}]
    [{'name' : 'b', 'val' : '1'}, {'name' : 'b', 'val' : '10'}],
]

Because 'a' is given as a parameter, it has priority. Then it is sorted from Z to A.

Solution should be written is ES5 (using lodash if possible).

Please visit the help center, take the tour to see what and How to Ask. Do some research, search for related topics on SO; if you get stuck, post a minimal reproducible example of your attempt, noting input and expected output using the [<>] snippet editor. — mplungjan
– mplungjan, Commented Mar 10, 2021 at 13:19
remove 'a', sort desc, then add the array with 'a' elements at the beginning. — Nir Alfasi
– Nir Alfasi, Commented Mar 10, 2021 at 13:20
@mplungjan > 'A' has priority (because it is given as a parameter in the function), so sorting function will go in this order: 1) A 2) Z to A — user3126180
– user3126180, Commented Mar 10, 2021 at 13:25

Nina Scholz · Accepted Answer · 2021-03-11 11:02:55Z

2

You could tried the one at top different from the others for sorting descending.

const
    sortBy = value => ([{ name: a }], [{ name: b }]) =>
        (b === value) - (a === value) ||
        b.localeCompare(a),
    array = [[{ name: 'b', val: '1' }, { name: 'b', val: '10' }], [{ name: 'a', val: '2' }, { name: 'a', val: '2' }], [{ name: 'c'}, { name: 'c', val: '100' }]];

array.sort(sortBy('a'));

console.log(array);

.as-console-wrapper { max-height: 100% !important; top: 0; }

ES5

var sortBy = function (value) {
        return function (a, b) {
            return (b[0].name === value) - (a[0].name === value)
                || b[0].name.localeCompare(a[0].name);
        };
    },
    array = [[{ name: 'b', val: '1' }, { name: 'b', val: '10' }], [{ name: 'a', val: '2' }, { name: 'a', val: '2' }], [{ name: 'c'}, { name: 'c', val: '100' }]];

array.sort(sortBy('a'));

console.log(array);

.as-console-wrapper { max-height: 100% !important; top: 0; }

edited Mar 11, 2021 at 11:02

answered Mar 10, 2021 at 13:28

Nina Scholz

388k26 gold badges367 silver badges417 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

user3126180 Over a year ago

thanks it works. However I asked for ES5 code

user3126180 · Accepted Answer · 2021-03-11 10:45:20Z

0

thanks to @NirAlfasi Advice, I found a way to do it:

function customSort(arr, sortBy, priority){
    var sortAZ = function(a,b){return (a[0][sortBy] < b[0][sortBy]) ? -1 : (a[0][sortBy] > b[0][sortBy]) ? 1 : 0;}
    var sortPrior = function(a,b){if(b[0][sortBy] === priority ){return 1} else {return 0}}

    arr.sort(sortAZ).reverse().sort(sortPrior);
}
customSort(ar,'name','a')

console.log(ar);

answered Mar 11, 2021 at 10:45

user3126180

Collectives™ on Stack Overflow

sort array of arrays in specific order using lodash

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related