uncaught typeerror: $ is not a function
The dollar-sign ($) in Javascript has for many years now been associated with jQuery.
When you see this error:
“uncaught typeerror: $ is not a …
Read Article →Technical Articles
In-depth guides, insights, and best practices for modern software engineering
How to get the last element of a list in Python
Let’s say that you have a Python list with the following 5 foods:
foods = ["pizza", "pasta", "steak", "chicken", …How to embed a web server in your Python3 app
This is not the first time that I created a Python3 application that spat out some output and required access to it via an HTTP server.
While there …
Read Article →How to get the Range Sum of Binary Search Tree using Java
Given the root node of a binary search tree, return the sum of values of all nodes with value between L and R (inclusive).
The binary search tree is …
Read Article →How to duplicate zeros in place using Python
Given a fixed length array arr of integers, duplicate each occurrence of zero, shifting the remaining elements to the right.
Note that elements beyond …
Read Article →A Quick Introduction to Asyncio in Python3
Python has never been the best at doing multiple things at the same time.
While there are ways to mostly resolve this, such as using the …
Read Article →How to replace newlines with commas in CLI
If you need to replace all newline characters with a comma, or perhaps some other delimiter, then using the build-in tr utility will work very well …
How to make a disk cache using PHP
If you have a busy PHP driven website and don’t want to make constant queries to the database for each user that will see the same data, then …
Read Article →How to remove files without a certain extension?
You have a directory with a lot of files, and you want to delete only the files that don’t match a specific extension.
This is a simple task …
Read Article →How to debug an Apache 404 error
So you are getting an error 404 or perhaps even worse, a 500!
The error in your Apache2 logs looks something like this:
***.162.245.*** - - …
How to Reorder Data in Log Files using Python
Let’s say that you have an array or a list, or logs.
Each of these logs is a space-delimited string of words.
For example:
logs = ["dig1 8 …
Another WTF Javascript Moment
Javascript is a powerful language, but sometimes it doesn’t always do what you expect it to.
Take the following expression for example. …
Read Article →