keyBy() : The keyBy() method keys the collection by the given key. If multiple items have the same key, only the last one will appear in the new collection:
const collection = collect([
{
product: 'Chair',
manufacturer: 'IKEA',
},
{
product: 'Desk',
manufacturer: 'IKEA',
},
{
product: 'Chair',
manufacturer: 'Herman Miller',
},
]);
const keyed = collection.keyBy('manufacturer');
keyed.all();
// {
// IKEA: {
// product: 'Desk',
// manufacturer: 'IKEA',
// },
// 'Herman Miller': {
// product: 'Chair',
// manufacturer: 'Herman Miller',
// },
// }
You may also pass a callback to the method. The callback should return the value to key the collection by:
const upperCased = collection.keyBy(item => item.manufacturer.toUpperCase());
upperCased.all();
// {
// IKEA: {
// product: 'Desk',
// manufacturer: 'IKEA',
// },
// 'HERMAN MILLER': {
// product: 'Chair',
// manufacturer: 'Herman Miller',
// },
// }
keys() : The keys() method returns all of the collection's keys:
const collection = collect([
{
club: 'Liverpool',
nickname: 'The Reds',
},
]);
keys = collection.keys();
// ['club', 'nickname']
