@launchmenu/core
Version:
An environment for visual keyboard controlled applets
33 lines • 2.51 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.groupBy = void 0;
/**
* Groups a list by a given key
* @param data The data to be grouped
* @param getKey Either a key string of data objects to group on, or a function to retrieve the data to group on.
*
* E.G. for `data=[{t: 3, k:"y"}, {t: 1, k:"y"}]`, `geyKey="k"` or `getKey=v=>v.k`.
* @param equals Comparison function to determine whether to given values to group on are equivalent
* @returns The grouped data
*/
function groupBy(data, getKey, equals = (a, b) => a == b) {
const result = [];
const getter = getKey instanceof Function ? getKey : (item) => item[getKey];
data.forEach(item => {
// Get the key, and find a group with this same key
const newKey = getter(item);
const group = result.find(({ key }) => equals(newKey, key));
if (group) {
// If such a group is found, at the item
group.values.push(item);
}
else {
// Otherwise, create a group with this item
const newGroup = { key: newKey, values: [item] };
result.push(newGroup);
}
});
return result;
}
exports.groupBy = groupBy;
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