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Lodash _.findLast


The lodash _.findLast method is a JavaScript utility function that searches for the last element in an array-like object that matches a given condition. It is part of the widely used lodash library, which provides a wide range of utilities for manipulating arrays, objects, and strings in JavaScript.

The syntax for the _.findLast method is as follows:

_.findLast(collection, [predicate=_.identity], [fromIndex=collection.length-1])

The collection parameter is the array-like object to search. The predicate parameter is an optional function that is called on each element of the collection, and the element is included in the result if the function returns a truthy value. If no predicate is present, the _.identity method is used, which returns true for all values. The fromIndex parameter is also optional, and it specifies the index to start searching from. If not provided, the search starts at the end of the collection.

The _.findLast method returns the last element in the collection that satisfies the predicate function, or undefined if no element is found.

Here's an example usage of the _.findLast method:

const numbers = [1, 2, 3, 4, 5];

const result = _.findLast(numbers, (n) => n % 2 === 0);

// Output: 4

In this example, the _.findLast method searches through the numbers array for the last even number. It finds the number 4, which is returned as the result.

Overall, the lodash _.findLast method is a useful utility for quickly searching through array-like objects in JavaScript and finding the last element that matches a given condition.