In this example we access a string (stored on the heap) and modify it using the & to borrow it and update it. Integers can be modified on the stack, but a String is an Array of unknown length so it has to live on the heap… Get the Rust Example Code:
The idea is to use “regtest” to try out bitcoin-cli with RPC and create a wallet, create a transaction. This is not about mining, this is about the code used to “Buy” or “Sell” Bitcoin and how you can interact with the blockchain using either the bitcoin-cli or Python code. https://github.com/RGGH/bitcoin
Did you know that when “sending” Bitcoin you actually don’t send the correct amount in the transaction? Did you know that Bitcoin has its own scripting language based on an old language called “Forth” ? Did you know that there can be more Bitcoin addresses than grains of sand on Earth? Did you know that […]
Sometimes when programming in Python, you may feel the need to use functions that were written in another language. This is usually because Python is much slower in comparison to compiled languages like C++ or C… Here is a quick intro – watch the 2nd video for the full breakdown! https://youtu.be/-drPr7vfyBk https://youtu.be/6OvV3pzQpDU “ctypes is a foreign […]
The dataclass() decorator will add various “dunder” methods to the class https://docs.python.org/3/library/dataclasses.html The parameters to dataclass() are: init: If true (the default), a __init__() method will be generated. If the class already defines __init__(), this parameter is ignored. repr the repr() function is used to get a printable string representation of an object repr: If […]
If you’re more familiar with Python and you want to learn C you’ll need to tackle pointers… Let’s look at an example : The first thing you may notice is that there is no need for a “return” from the function…. Example 1 – Pointers Example 2 – Pointer that updates conditionally, based on values […]
Many API endpoints require use of the POST method. Here we look at how you can use Python and Requests to work with an API. Example code and a real world example connecting to the EBAY API. Endpoint – The URL that delineates what data you are interacting with. Method – Specifies how you’re interacting […]
A collection of useful JavaScript functions and handy tips / study notes forEach Map Filter Invoking a class Clickable div – linked to a js function Use JavaScript to fetch data API – JS – HTML Demo We use JavaScript to fetch from an API and create a new element in the html for each […]
Javascript callback functions explained. As well as Python we’ll be adding semi regular tips and case studies of JavaScript code and features. In this article we’ll look at “callback” functions in JavaScript. Let’s simplify them down to a very basic example which we show here: The above will print to console. We have a function […]