Vlad Nabatov nabato

Setting up lisp on Mac OS X

Note: this tutorial only outlines how to install and setup whats necessary to compile and run lisp on Mac OS X, it will not go over how to setup emacs or slime. Instead there will be instructions for how to get syntax highlighting on VsCode. If you don't have VsCode download and install it from here https://code.visualstudio.com/download

This tutorial is under the impression that you do not have Homebrew installed, if you do just skip the step.

1. Installation of Homebrew

Homebrew is a common installation tool on mac that will make the rest of this tutorial possible.

ES Modules are terrible, actually

This post was adapted from an earlier Twitter thread.

It's incredible how many collective developer hours have been wasted on pushing through the turd that is ES Modules (often mistakenly called "ES6 Modules"). Causing a big ecosystem divide and massive tooling support issues, for... well, no reason, really. There are no actual advantages to it. At all.

It looks shiny and new and some libraries use it in their documentation without any explanation, so people assume that it's the new thing that must be used. And then I end up having to explain to them why, unlike CommonJS, it doesn't actually work everywhere yet, and may never do so. For example, you can't import ESM modules from a CommonJS file! (Update: I've released a module that works around this issue.)

And then there's Rollup, which apparently requires ESM to be u

Setting up shadow-cljs cljs REPL in Cursive

See

in shadow-cljs.edn:

,,,

Interview Questions

Node.js

Q1: What do you mean by Asynchronous API? ☆☆

Answer: All APIs of Node.js library are aynchronous that is non-blocking. It essentially means a Node.js based server never waits for a API to return data. Server moves to next API after calling it and a notification mechanism of Events of Node.js helps server to get response from the previous API call.

Source: tutorialspoint.com

lodash/fp - set / flow

In this gist we are going to learn about basic goodies that we get from the library lodash/fp (fp stands for functional programming, great for ensuring immutability).We'll learn just by doing (step by step guided sample + codepens).

We'll cover lodash set and flow functions

Steps

We'll use codepen as our playground, navigate to this page:

	import fs from "node:fs";
	import { fileURLToPath } from 'url'
	const __filename = fileURLToPath(import.meta.url)
	import { Worker, isMainThread, parentPort } from 'node:worker_threads';
	import { performance } from "node:perf_hooks";

	/** Output filename */
	const output_fname = "./results.csv";
	/** Use a wrapper around Set, to make the comparison more even for inlined array operations */
	const COMPARE_INLINED = true;

	import { FetchBaseQueryError } from '@rtk-incubator/rtk-query/dist';

	/**
	* Default tags used by the cacher helpers
	*/
	const defaultTags = ["UNAUTHORIZED", "UNKNOWN_ERROR"] as const;
	type DefaultTags = typeof defaultTags[number];

	function concatErrorCache<T, ID>(
	existingCache: CacheList<T, ID>,

	<code_scheme name="TW" version="173">
	<ClojureCodeStyleSettings>{
	:cljs.core/as-> :only-indent
	:cljs.core/assoc 0
	:cljs.core/cond-> :only-indent
	:cljs.core/cond->> :only-indent
	:cljs.core/defonce :only-indent
	:cljs.core/with-meta :only-indent
	:cljs.core.async/go :only-indent
	:cljs.core.async/go-loop :only-indent

	/*
	*
	* Return SQLite3 query results as a Nodejs stream, sensitive to backpressure.
	*
	* Assumes a foo.db file with a lot of rows - I used 1000 with a number & a string
	*/

	const stream = require('stream');
	const sqlite = require('sqlite3');
	class DBStream extends stream.Readable {

	// Note: only for modern browser
	import axios from 'axios'

	// helper function: generate a new file from base64 String
	const dataURLtoFile = (dataurl, filename) => {
	const arr = dataurl.split(',')
	const mime = arr[0].match(/:(.*?);/)[1]
	const bstr = atob(arr[1])
	let n = bstr.length
	const u8arr = new Uint8Array(n)