# How do you find the intersection of two lists?

## How do you find the intersection of two lists?

Example –

1. # Python program to get the intersection.
2. # of two lists.
3. def intersection(list1, list2):
4. # Use of hybrid method.
5. temp = set(list2)
6. list3 = [value for value in list1 if value in temp]
7. return list3.
8. list1 = [40, 90, 11, 58, 31, 66, 28, 54, 79]

How do you find the union and intersection of two arrays in Java?

Create two sets called union and intersection. To find the union, add the first array’s elements to the set union. Now, add all the second array elements if they are not present in the set union. To find the intersection, find the common elements and add them to the set.

### How are unions implemented in Java?

Learn to find the union between two arrays in Java using HashSet class….To get the union of two arrays, follow these steps:

1. Push first array in a HashSet instance.
2. Use addAll() method to add the elements of the second array into set.
3. Similarly, add all the elements of more arrays in the set, if any.

How are elements of the intersection of two or more sets determined?

The intersection of two sets, X and Y, is the set of elements that are common to both X and Y. It is denoted by X ∩ Y, and is read “X intersect Y”. So the intersection of two sets is the set of elements common to both sets.

## How do you create a union in Java?

To get the union of two sets, use the addAll() method.

Is union and or or?

More precisely, the union of two sets A and B is the set of all elements x such that x is an element of the set A or x is an element of the set B. The word that signifies that we are using a union is the word “or.”

### How to get the intersection of two sets in Java?

To get the intersection of two sets, use the retainAll () method. Here are out two set −

What is the return value of intersection of two sets?

The returned set contains all elements that are contained by both backing sets. The iteration order of the returned set matches that of set1. Return Value: This method returns an unmodifiable view of the intersection of two sets.

## How do I find the intersection of two sets in guava?

Guava’s Sets.intersection () returns an unmodifiable view of the intersection of two sets. The returned set contains all elements that are contained by both backing sets. The iteration order of the returned set matches that of set1.

How do I preserve the intersection of two sets in JavaScript?

2 Answers 2 ActiveOldestVotes 460 Use the retainAll()method of Set: Set s1; Set s2; s1.retainAll(s2); // s1 now contains only elements in both sets If you want to preserve the sets, create a newset to hold the intersection: