The rmap library was one of my first Clojure libraries. It lets you create recursive maps, both programmatically and in literal form. They are recursive in the sense that entries in the map can refer to other entries.The library has seen its first major update. It is far simpler now, and more powerf...

The Clojure Standard LibraryClojure’s standard library (aka the Core Library) is well thought-of and a pleasure to use....

The Clojure function cycle take a collections as argument and creates a lazy sequence by repeating the items in the collection. So if we pass a collection with the characters \a, \b and \c we get a lazy sequence of (\a \b \c \a \b \c ...).(ns mrhaki.core.cycle (:require [clojure.test :refer [is]])...

The goal of this article is to introduce Datahike's Java API. To do so we will create a small web application together. The figure below illustrates the application architecture and lists some of the core advantages of using Datahike. Datahike is an open source, light-weight Datalog runtime wit...

Issue 380 – June 01, 2020 · Archives · Subscribe Clojure Tip 💡 what can you iterate through? I was helping a friend solve a coding challenge the other day and I quickly found a linear algorithm when he was sure it had to be quadratic. The key was that there were two collections. If you iterated th...

Modern frontends are complicated things. Most modern web applications use some form of the single page application (SPA) approach, like React or Vue, to deliver the user interface. This approach makes sense in many cases as it separates the frontend and the backend work cleanly.The SPA approach also...

Time libs on npm/Shadowtick is a Clojure(Script) library for working with time. cljc.java-time is used by tick and provides a cross-platform version of the java.time api....

It is often said one should not offer criticism without suggesting an alternative. In a previous post which dealt with the idiomatic ways of mixing side effects and iteration in Clojure, I mentioned pmap is a bad option for performing side effects in parallel. Since I'm not paid highly enough......

The Clojure function zipmap create a map by interleaving a collection of keys with a collection of values. The first element of the keys collection is the map entry keyword and the first element of the values collection is than the map entry value, and so on for the other elements in the keys and va...

In this episode, we talk to Cliff Click about Burning Man, programming languages, compilers and being an introvert.Our Guest, Cliff Click...

TLDR: this post is a copy of readme file from the GitHub repo.Maps are quite common in Clojure, and thus s/keys specs too. Here is a common example:...

I've been a professional software developer for almost half a year now, and I'm still super insecure about my front-end skills. So insecure to the point where at work I make a conscious effort to avoid front-end related tasks by citing my specialty and affinity for the back-end which is a complete l...

Env Vars in under 100 Lines of Code — (.env)Photo by John O’Nolan on Unsplash...

If you follow me on facebook you know that I’ve been publishing daily CoronaVirus statistics. I generate these statistics using the daily updates in the Johns Hopkins github repository.At first I just hand copied the data into a spreadsheet. But that became tedious quite rapidly....

ClojureScript is a variant of Clojure which compiles to JavaScript. This makes ClojureScript usable in devices that can run JavaScript such as browsers and backend services using Node.js.Traditionally ClojureScript has been mostly used in browsers and backends have been made with Clojure or with ot...

Slash GraalVM Clojure Compilation Time With This One Weird Trick

Are you building a clojure project and compiling it to a native bin...

Issue 379 – May 25, 2020 · Archives · Subscribe Clojure Tip 💡 get has unexpected behavior, as expected Some people wonder about why get returns nil when the key is not found in the map. I actually like that behavior and dislike the behavior in other languages when it is an error to ask for somethi...

The goal of this article is to introduce Datahike’s Java API. To do so we will create a small web application together. The figure below illustrates the application architecture and lists some of the core advantages of using Datahike. Datahike is an open source, light-weight Datalog runtime with dur...

In preparation for the SpaceX Crew Dragon’s first crewed mission Demo-2 in late May, SpaceX released a pretty cool little WebGL docking…Continue reading on Level Up Coding »...

Ok, so profiling the extra-low-hanging-fruit in terms of generic function performance revealed that it didn't do much in our situation. My next idea was to subvert the Common Lisp type system to give our set and map primitives some hints about what kind of equality operations to use.I'm once again s...