this is of course the source of much confusion in JavaScript. The reason being that this depends on how the function was invoked, not where the function was defined. JavaScript without this looks like a better functional programming language. this losing context Methods are functions that are stored in objects. In order for a function to know on which object to...
Here’s a neat Python trick you might just find useful one day. Let’s look at how you can dynamically define classes, and create instances of them as required. This trick makes use of Python’s object oriented programming (OOP) capabilities, so we’ll review those first. Classes and objects Python is an object-oriented language, meaning it lets you...
Recently, I needed a piece of software where you can input some numbers, validate and process them, and print some result. Since I needed to do scientific computing with it I decided to use Python with NumPy and SciPyand because I needed validation I decided that HMTL input validations would be the easiest to use. Then I had...
There are concepts which are very similar, yet different and confuses many people. Referential transparency vs immutability Referential transparency is a concept in a programming language which guarantees that once the value is assigned to the variable it will not changethere is no way to assign a different value to it. For example, in ES6 you...
Originally posted at carloscuesta’s blog It’s been a while since I’ve started working with React and React-Native in production. One of the greatest things about React is the flexibility the library gives to you. Meaning that you are free to decide how do you want to implement almost every detail of your project for example the architecture and structure. However this freedom on the long term, could...
Cyclomatic what? Even spell check doesn’t recognise the word, but it’s a super useful software metric for understanding how your software works. Having read about it a few years ago, it apparent use seems to have deteriorated. I feel it’s a very valuable tool in a developer’s arsenal, and something that should be used in...
Python has thrived over the past few decades as the language which lets you work quickly and effectively. Like many modern companies, we use Python quite extensively for a majority of our stack, but in many cases, continue to live on Python 2.7. The harsh reality is that Python 2.7 is going away, and honestly — it’s about...
On this episode we will build our own implementation of an observable. I hope that by the end of this post we gain a better understanding of this pattern that is used in libraries like RxJS. About Observables What is it? Lets start with my definition of observable. An Observable is a function that follows a convention...
Python tips which are relatively uncommon and are very useful. Talk is cheap show me the code Swapping values Create a single string from all the elements in list Find The Most Frequent Value In A List. Checking if two words are anagrams Reverse a String Reverse a list Transpose 2d array Chained Comparison Chained function call Copying List Dictionary Get Sort Dictionary by Value...
Used for general purpose programming, data science, website backends, GUIs, and pretty much everything else; the first programming language for many, and claimed to be the fastest growing in the world, is of course Python. The newest version 3.7.0 has just recently been released. Naturally any release of Python, no matter how small, undergoes meticulous planning...
As I was chatting, someone from Coding Blocks slack channel (#javascript) has asked a question regarding a code snippet var uniqueInOrder = function (iterable) { return [].filter.call(iterable, (function (a, i) { return iterable[i – 1] !== a })); } view rawuniqueInOrder.js hosted with ❤ by GitHub His question was “Kinda lost in the [].filter.call , etc part.” I will show you...
Reflection – What you need to know. In computer science, reflection is the ability of a computer program to examine, introspect, and modify its own structure and behavior at runtime.[1] So what does that mean? Reflection is a term thrown around every now and again and but do you really know what it means? Why...
Table of Contents The breakpoint() Built-In Data Classes Customization of Module Attributes Typing Enhancements Timing Precision Other Pretty Cool Features The Order of Dictionaries Is Guaranteed “async” and “await” Are Keywords “asyncio” Face Lift Context Variables Importing Data Files With “importlib.resources“ Developer Tricks Optimizations So, Should I Upgrade? Python 3.7 is officially released! This new Python...
Once in a while, you may need to loop through Objects in JavaScript. The only way to do so before ES6 is with a for...in loop. The problem with a for...in loop is that it iterates through properties in the Prototype chain. When you loop through an object with the for...inloop, you need to check if the property belongs to...
In JavaScript, you can reassign values to variables you declared with let or var. I used to reassign values a lot. But as I got better with JavaScript, I realized you shouldn’t reassign values if you can. This is because: You may change external state by accident when you reassign values You create more complex code when you...
I recently read an article by Max Bittker called “How to Review Code You Don’t Understand”, and it got me to thinking about times when I’ve been tasked with doing just that. One of the troubles I have with code review is understanding the context around a change. Given a diff, I can work through it...
This article is aimed at people starting out with asynchronous coding in javascript so we would keep things simple by avoiding big words, arrow functions, template literals etc. Callbacks are one of the most used concepts of modern functional javascript and if you’ve ever used jQuery, chances are you’ve already used callbacks without even knowing...
Functional programming languages are one of the programming trends nowadays. We see several imperative languages influenced by functional programming, being this javascript, ruby, python and even php. The problem is that the majority of programmers don’t take the initiative to learn a full functional programming language, missing the opportunity to expand their technical knowledge and...
Chapter 1Intro 1.1 Objectives After the event, we expect the attendees to leave with the following knowledge, skills and attributes. 1.1.1 Knowledge pros/cons of static typing in Go what makes Go unique what is Go particularly good at what are the challenging parts of Go 1.1.2 Skills know how to do data modeling...
I have been using Sublime Text for coding in PHP for several months now and over that time have accumulated several useful plugins and editor settings. I have not seen many recent articles about setting up Sublime Text, especially for PHP, so I want to share how my setup works and what has been most...
