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Lodash _.intersection


The lodash _.intersection method is a popular JavaScript utility function that is used to find the intersection between two or more arrays. It takes two or more arrays as arguments and returns a new array containing the elements that are present in all of the input arrays.

The _.intersection method works by iterating over every element in the first array and checking if it is present in all of the other arrays. If an element is present in all of the arrays, it is added to the output array. The resulting array contains only unique values that are common to all arrays.

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

const arr1 = [1, 2, 3, 4];
const arr2 = [2, 4, 6, 8];

const result = _.intersection(arr1, arr2);

console.log(result); // [2, 4]

In this example, the _.intersection method is used to find the common elements in the arr1 and arr2 arrays. The resulting array contains only the values 2 and 4, which are present in both input arrays.

The _.intersection method also works with more than two input arrays, as shown in the following example:

const arr1 = [1, 2, 3, 4];
const arr2 = [2, 4, 6, 8];
const arr3 = [3, 4, 5, 6];

const result = _.intersection(arr1, arr2, arr3);

console.log(result); // [4]

In this example, the _.intersection method is used to find the common elements in the arr1, arr2, and arr3 arrays. The resulting array contains only the value 4, which is present in all three input arrays.

The _.intersection method is a useful function for working with arrays in JavaScript. It can be used for a variety of tasks, such as filtering out unwanted values or finding common elements across multiple arrays.