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How-to articles, tricks, and solutions about LIST

How do I find the duplicates in a list and create another list with them?

In Python, one way to find duplicates in a list and create another list with them is to use a for loop and an if statement.

list python duplicates

How do I get the last element of a list?

To get the last element of a list, you can use negative indexing.

list python indexing

How do I get the number of elements in a list (length of a list) in Python?

To get the number of elements in a list in Python, you can use the len() function.

list python

How do I iterate through two lists in parallel?

You can use the zip() function to iterate through two lists in parallel.

list python iterator for-loop

How do I join two lists in Java?

There are several ways to join two lists in Java. Here are a few options:

java list java-5

How do I make a flat list out of a list of lists?

To create a flat list out of a list of lists, you can use the itertools.chain function from the itertools module in the Python standard library.

list python multidimensional-array flatten

How do I remove duplicates from a list, while preserving order?

There are several ways to remove duplicates from a list while preserving order.

list python duplicates list-comprehension unique

How do I remove repeated elements from ArrayList?

To remove repeated elements from an ArrayList in Java, you can use the removeAll method and pass it a Collection containing the elements to be removed.

java list collections arraylist duplicates

How do I remove the first item from a list?

You can use the list method pop(index) to remove the first item in a list.

list python

How do I reverse a list or loop over it backwards?

There are a few ways to reverse a list in Python, depending on what you want to do with the reversed list.

list python