contains() : The contains() method determines whether the collection contains a given item :
const collection = collect({
name: 'Free Time Learn',
number: 12,
});
collection.contains('name');
// true
collection.contains('age');
// false
collection.contains('Free Time Learn');
// true
You may also work with arrays
const collection = collect([1, 2, 3]);
collection.contains(3);
// true
You may also pass a key / value pair to the contains method, which will determine if the given pair exists in the collection:
const collection = collect({
name: 'Free Time Learn',
number: 12,
});
collection.contains('name', 'Steve Jobs');
// false
Finally, you may also pass a callback to the contains method to perform your own truth test:
const collection = collect([1, 2, 3, 4, 5]);
collection.contains((value, key) => value > 5);
// false
