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Lodash _.pullAllWith

Overview

The lodash _.pullAllWith method is a convenient function that allows you to remove all elements from an array that match the provided values according to a custom comparator function.

The function takes two arguments: the array to modify, and an array of values to remove using the custom comparator function. The third argument is the custom comparator function. The comparator function is a function that takes two arguments, the first value to compare and the second value to compare. If the comparator function returns true, the two values are considered equal and the first value will be removed from the array.

This method is similar to the _.pullAll method, but with the added ability to use a custom comparator function. This means that you can provide your own logic for determining if two values are equal, and therefore eligible for removal from the array.

This method modifies the original array and returns the modified array. If the array does not contain any of the values to remove, the original array will not be modified.

To use the _.pullAllWith method, first import it from the lodash library:

import { pullAllWith } from 'lodash';

Or, if you prefer the classic syntax:

const { pullAllWith } = require('lodash');

Then, pass the array to modify, the array of values to remove, and the custom comparator function as arguments:

const arr = [
  { name: 'John', age: 25 },
  { name: 'Jane', age: 30 },
  { name: 'Bob', age: 20 }
];

const valuesToRemove = [
  { name: 'John', age: 25 },
  { name: 'Bob', age: 20 }
];

const customComparator = (a, b) => a.name === b.name && a.age === b.age;

pullAllWith(arr, valuesToRemove, customComparator);

console.log(arr);
// Output: [{ name: 'Jane', age: 30 }]

In the above example, the _.pullAllWith method removes the two values that match the valuesToRemove array according to the custom comparator function provided as the third argument. The modified array is then logged to the console.

In summary, the _.pullAllWith method is a helpful utility function that makes it easy to remove elements from an array based on a custom comparator function. Its flexibility and ease of use make it a useful tool for any JavaScript developer.