What is concat() method in Collect.js?

Collect.js - Interview Questions

concat() : The concat() method is used to merge two or more collections/arrays/objects :

You can also concat() an array of objects, or a multidimensional array

const collection = collect([1, 2, 3]);

let concatenated = collection.concat(['a', 'b', 'c']);

concatenated = concatenated.concat({
  name: 'Free Time Learning',
  number: 12,
});

concatenated.all();

// [1, 2, 3, 'a', 'b', 'c', 'Free Time Learn', 12]