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I'm doing exercises from The Little Schemer, but I do them in Racket using DrRacket.

One of the exercises has two methods referencing each other. Can this be done in Racket and if so, how?

When trying to do it in DrRacket ide I get an error because the one created higher up in the file can't reference something that comes after. I'm assuming this is because it's being interpreted, but I'm not sure.

Is there a way around this issue?

I've been playing around with d3.js for the first time and have managed to create a basic chloropleth map.

In essence there are 3 things remaining that i'd like to do, but am not familiar enough with d3 or Javascript to do them:

1. Make legend horizontal and move it below the coast of Africa

2. Add thin black border to all of the countries.

3. Perhaps automatically crop out antartica? This can be done in post processing if not possible

Not sure if these tasks are impossible or easy as I have not worked much with d3.js and wasn't making much headway.

I was working with the minikanren library for Racket, but wanted to use the "disj" and "conj" operators. I want to be able to more explicitly declare whether I am using disj or conj for the sake of legibility rather than have to parse through a conde expression, especially once the expressions become more complicated. I copied the source from "The Reasoned Schemer":

I am a new schemer. Maybe this question is so easy. But it really bothers me.

I defined a procedure

Suppose I have a string containing a date: "11/10/2020" (mm/dd/yyyy). Is there a way to parse this into a date data type in Racket? Scheme has SRFI 19 (Time Data Types and Procedures) which defines string->date for parsing date strings. Is there something similar in Racket?

My question is very similar to D3 V4 Properly placing a bubble in the US Map, but the map I'm using is a map of Scotland's local authority districts instead so I can't quite see how to apply either of the solutions.

I'm creating a bubble map on top of a choropleth map of Scotland, with circles at specified locations which I'm providing as latitude/longitude coordinates.

However, the locations of the circles are completely out - the circle for Aberdeen is in the sea!

Based on D3 V4 Properly placing a bubble in the US Map, I think perhaps the GeoJSON is pre-projected so I'm using two different projections, one for the map and one for the circles. Ideally I think I would find a different GeoJSON that didn't cause this problem, but I think the one I'm using from https://martinjc.github.io/UK-GeoJSON/ is the only one available.

So my question is, is there a sensible method for figuring out what projection this map is, in order that I can use the same projection for the circles?

I would like to implement a functional stack in scheme. This is my attempt:

This is a bit of follow-up to an earlier question I posted. My basic problem was to build a application with Gambit Scheme.

While the solution suggested in the question mentioned above works, it is kinda cumbersome so I decided to try and add Gambit Scheme as custom compiler/language to CMake. Following the suggestions in this question, I created the following files:

cmake/CMakeDetermineGambitCompiler.cmake:

I have been playing around with miniKanren, trying to understand it by converting very basic Prolog tutorials into it.

I use Python habitually so I started with the LogPy library, which has since been forked and improved upon as a lib actually called miniKanren

From the example given in the lib's README we can see: