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How-to articles, tricks, and solutions about LIST

Does java.util.List.isEmpty() check if the list itself is null?

No, the isEmpty() method of the java.util.List interface does not check if the list itself is null.

java list

Fastest way to check if a value exists in a list

The fastest way to check if a value exists in a list is to use the in operator.

list python performance

Finding and replacing elements in a list

Here is a Python code snippet that demonstrates how to find and replace elements in a list:

list replace python

Finding the average of a list

Here is a Python code snippet for finding the average of a list of numbers:

list python average mean reduce

Finding the index of an item in a list

To find the index of an item in a list in Python, you can use the index() method of the list.

list python indexing

Get difference between two lists with Unique Entries

You can use the set data type to find the difference between two lists with unique entries.

list set python performance set-difference

Get list from pandas dataframe column or row?

In Pandas, a DataFrame is a 2-dimensional labeled data structure with columns of potentially different types.

list python pandas dataframe

Get unique values from a list in python

In Python, you can use the set() function to get the unique values from a list.

list python

Getting the index of the returned max or min item using max()/min() on a list

You can use the enumerate() function along with max() or min() to get the index of the maximum or minimum item in a list in Python.

list python max min

How can I compare two lists in python and return matches

To compare two lists and return the matches, you can use the built-in intersection() method of the set data type.

list python