May 31, 2023 ⤳ List comprehension is a programming technique to create a new list based on an existing list. This quick guide explores three approaches to JavaScript list comprehension (a.k.a array comprehension). Programmers use list or array comprehension for two reasons: List comprehension is usually available as a language construct in ...

May 12, 2023 ⤳ One of the most common tasks when working with variables in Python is to return a default value if a variable (or a dictionary item) is None or if it doesn’t even exist. This quick guide explores four methods of returning a default value if ...

May 11, 2023 ⤳ The Python error “ValueError: I/O operation on closed file” happens when you try to do I/O operations (read, write, etc.) on a file that’s already been closed. Here’s what the error looks like: This quick guide explains why this error happens and how to fix ...

May 31, 2023 ⤳ When working with strings in JavaScript, it’s important to check if a variable is a string before performing any string-related operations – specially when you get the value from an API . This quick guide explores four methods for checking if a variable is a ...

May 08, 2023 ⤳ Python __new__() method is static method (a.k.a magic or dunder method) that gives the programmer more control over how a specific class (cls) is instantiated. This quick guide explains the __new__() method and how and when to use it. How does the Python __new__() method ...

Mar 31, 2023 ⤳ Python raises “SyntaxError: unterminated triple-quoted string literal” when you use a pair of triple quotes (""" or ''') around a multi-line string literal, but the ending part is missing. Here’s what the error looks like on Python version 3.11: On the other hand, the error ...