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Lodash _.pullAt

Overview

The lodash _.pullAt method is a convenient utility function that allows developers to easily remove elements from an array based on their indices. This method is particularly useful when dealing with arrays of objects, as it can simplify the process of removing specific objects from the array based on their position.

To use _.pullAt, developers simply need to provide an array of indices to remove, and the method will return a new array containing the removed elements. The original array will be modified to exclude the removed elements.

Here is an example usage of _.pullAt:

const array = ['a', 'b', 'c', 'd'];
const removed = _.pullAt(array, [1, 3]);

console.log(array); // -> ['a', 'c']
console.log(removed); // -> ['b', 'd']

In the above example, we start with an array that contains four elements. We call _.pullAt with an array of indices [1, 3], which correspond to the positions of the elements we want to remove ('b' and 'd'). The method returns a new array removed containing those elements, and the original array has been modified to exclude those elements.

_.pullAt can also be used with arrays of objects. Here is an example:

const array = [
  { id: 1, name: 'Alice'},
  { id: 2, name: 'Bob'},
  { id: 3, name: 'Charlie'}
];

const removed = _.pullAt(array, [1]);

console.log(array); // -> [{ id: 1, name: 'Alice' }, { id: 3, name: 'Charlie' }]
console.log(removed); // -> [{ id: 2, name: 'Bob' }]

In this example, we have an array of objects. We call _.pullAt with an array containing a single index, 1, which corresponds to the second object in the array ({ id: 2, name: 'Bob' }). The method returns a new array containing that object, and the original array has been modified to exclude it.

One important thing to note about _.pullAt is that it modifies the original array in place. If you want to preserve the original array, you should create a copy of it before calling _.pullAt. For example:

const array = ['a', 'b', 'c', 'd'];
const arrayCopy = [...array];
const removed = _.pullAt(arrayCopy, [1, 3]);

console.log(array); // -> ['a', 'b', 'c', 'd']
console.log(arrayCopy); // -> ['a', 'c']
console.log(removed); // -> ['b', 'd']

In this example, we create a copy of the array using the spread operator ([...array]). We call _.pullAt with the copy, leaving the original array intact.