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Lodash _.eachRight

Overview

The _.eachRight method in the Lodash library is a convenient way to iterate over elements in a collection from right to left. It is treated as a functional programming utility and returns the original collection. _.eachRight is similar to the _.each method, but it iterates in reverse order from the end of the array.

The syntax for using _.eachRight is as follows:

_.eachRight(collection, [iteratee=_.identity])

Where:

  • collection (Array|Object): The collection to iterate over.
  • [iteratee=_.identity] (Function): The function to iterate over the collection.

Here is a detailed explanation of the parameters:

collection

The collection (Array or Object) to iterate over.

iteratee

The function to execute on each element in the collection. The iteratee receives the following arguments: (value, key|index, collection).

  • value (Any): The current element being processed in the collection.
  • key|index (String|Number): The key or index of the current element in the collection.
  • collection (Array|Object): The collection being iterated over.

The iteratee function is called with three arguments: (value, key|index, collection). If the iteratee returns false, execution is stopped and the iteration is considered complete.

Here is an example usage of the _.eachRight method:

_.eachRight([1, 2, 3], function(value) {
  console.log(value);
});
// Output: 3, 2, 1

In the example above, _.eachRight is used to iterate over an array in reverse order and log each value to the console.

In conclusion, _.eachRight is a useful method for iterating over collections in reverse order. It is fairly simple to use, and is a convenient way to perform certain tasks when dealing with arrays or objects.