Learning ES2015 : let, const and var

Lions at the zoo Zoos allow for safely viewing dangerous wild animals like lions. Lions are caged in their enclosures and can't escape its boundaries (if they did, it'd be chaos eh?). Handlers, however, can get into cages and interact with them. Like cages, you can think of variable scoping rules as establishing the boundaries and walls in … Continue reading Learning ES2015 : let, const and var

Chrome dev tools deep dive : Console

The console is one of favorite places. The REPL environment is a quick way to validate JavaScript expressions. However, there is a lot more it can do. Read on. 1. $0 - $4 selectors The last inspected element is always available in the console as $0. $1 points to the next most-recently element and so … Continue reading Chrome dev tools deep dive : Console

Chrome dev tools deep dive : Elements

1. Search CTRL + F allows you to search for strings in the DOM but you can also search using CSS selectors and XPath expressions. 2. Color picker Ever wanted to figure out what colours exist on a web page? Or prefer some other colour format? Here comes the color picker: Shift click on the color … Continue reading Chrome dev tools deep dive : Elements

Understanding and using Streams in JavaScript

Let's take a scenario from Mathematics, how would you model the infinite set of natural numbers? A list? An Array? Or a Stream? Even with infinite storage and time, lists and arrays do not work well enough for this scenario. Why? Assuming the largest possible integer an array can hold is x, then you've obviously missed out onx + 1. Lists, although not constrained by initialization, need to have every value defined before insertion.

What is Semantic Versioning (SemVer)?

Software Versioning Software versioning has always been a problem for software developers, release managers and consumers since time immemorial. For developers, the challenge lies in releasing new breaking changes while simultaneously minimizing consumer upgrade pains. On the flip side; consumers, when they finally decide to upgrade to new-shiny-release-10000, want to be sure they are not buying a one-way-ticket … Continue reading What is Semantic Versioning (SemVer)?

SICP Section 3.3 – 3.5 : Found a bug in memq

1. Is memq broken? memq is an in-built list search function; it finds the first occurrence of a key in a list and returns a new list starting from that key. Now that you know what memq does, lets look at some weird behaviour Building on that foundation leads to the following conundrum memq tests whether the key exists in the … Continue reading SICP Section 3.3 – 3.5 : Found a bug in memq