Group By


Simple method to group an array by a given key in the array. The method uses a callback function to choose the
value to group the values by and returns an object which have all the ordered values in an array under the given key name.

Example:

``js
import groupBy from '@jitesoft/group-by';

let array = [ { "id": "abc", "value": "abc" },
{ "id": "abc", "value": "def" },
{ "id": "abc", "value": "ghi" },
{ "id": "def", "value": "abc" },
{ "id": "def", "value": "def" },
{ "id": "ghi", "value": "abc" } ];

let result = groupBy(array, (obj) => obj.id);

// Output:
let obj = {
abc: [
{ "id": "abc", "value": "abc" },
{ "id": "abc", "value": "def" },
{ "id": "abc", "value": "ghi" }
],
def: [
{ "id": "def", "value": "abc" },
{ "id": "def", "value": "def" }
],
ghi: [
{ "id": "ghi", "value": "abc" }
]
};
``