Explain merge methods in Collect.js

Collect.js - Interview Questions

merge() : The merge() method merges the given object into the original collection. If a key in the given object matches a key in the original collection, the given objects value will overwrite the value in the original collection:

const collection = collect({
  id: 1,
  price: 29,
});

const merged = collection.merge({
  price: 400,
  discount: false,
});

merged.all();

// { id: 1, price: 400, discount: false }

If our collection is an array, the values will be appended to the end of the collection:

const collection = collect(['Unicorn', 'Rainbow']);

const merged = collection.merge(['Sunshine', 'Rainbow']);

merged.all();

// ['Unicorn', 'Rainbow', 'Sunshine', 'Rainbow']

mergeRecursive() : The mergeRecursive() method merges the given array or collection recursively with the original collection. If a string key in the given items matches a string key in the original collection, then the values for these keys are merged together into an array, and this is done recursively:

const collection = collect({
  product_id: 1,
  price: 100,
});

const merged = collection.mergeRecursive({
  product_id: 2,
  price: 200,
  discount: false,
});

merged.all();

// {
//   product_id: [1, 2],
//   price: [100, 200],
//   discount: false,
// }