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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters <?xml version="1.0" encoding="UTF-8"?> <opml version="1.0"> <head> <title>RSS subscriptions for axel@rauschma.de</title> <dateCreated>Sat, 02 Aug 2025 13:20:09 +0000</dateCreated> <ownerEmail>axel@rauschma.de</ownerEmail> </head> <body> <outline text="Sustainability" title="Sustainability"> <outline text="Modern Farmer" title="Modern Farmer" type="rss" xmlUrl="http://modernfarmer.com/feed/" htmlUrl="https://modernfarmer.com/"/> This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters #!/usr/bin/env node import { watch } from 'node:fs/promises'; import * as fs from 'node:fs'; import * as path from 'node:path'; async function main() { const args = process.argv.slice(2); if (args.length === 0) { const bin = path.basename(process.argv[1]); Creating synchronous iterators
The methods of class Iterator let us process data incrementally. Let’s explore where we can use them.
Getting iterators from iterables
Iterator.from(iterable) always returns instances of Iterator (converting non-instances to instances as needed).iterable[Symbol.iterator]() returns an iterator:
- With all built-in data structures, the result is an instance of
Iterator.
- With other, older iterable objects, the result may not be an instance of
Iterator.
Framework Laptop 13 DIY Edition (previous generation, 2024-05-20)
For sale in Munich (to be picked up in person): EUR 700
- Original price (2024-05-20): €1269
- Intel Core i5-1340P (13th Gen)
- RAM: 2 × 16GB (DDR4-3200)
- SSD: 500GB (WD_BLACK SN770 NVMe)
- Expansion “cards” (that slot into the laptop case):
- 2 USB-C
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters // More information on enum objects as an alternative to enums: // https://2ality.com/2025/01/typescript-enum-patterns.html#alternative-to-enum%3A-object-literal-1 /** * Returns an enum object. Adds the following improvements: * - Sets the prototype to `null`. * - Freezes the object. * - The result has the same type as if `as const` had been applied. */ function createEnum<
- If you see a JavaScript feature in this book that you don’t understand, you can look it up in my book “Exploring JavaScript” which is free to read online. Some of the “Further reading” sections at the ends of chapters refer to this book.
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The official “TypeScript Handbook” is a good reference for the language. It currently has a few holes that are filled by the release notes and GitHub pull requests (which handbook and release notes link to).
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“TypeScript Deep Dive” by Basarat Ali Syed was not updated much after 2020 – e.g., it does not cover template string types. But this book is still a valuable resource.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters // Experiment: I’m not sure if I would use this myself. const call = Symbol('call'); class Callable { constructor() { // Can’t use .bind() here. Not sure why. Maybe the result doesn’t // interact well with Object.setPrototypeOf(). const _this = (...args) => new.target.prototype[call].call(_this, ...args); Object.setPrototypeOf(_this, new.target.prototype); return _this; This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters //========== Testing types ========== const expectType = <Type>(_: Type): void => void 0; type TypeEqual<Target, Value> = (<T>() => T extends Target ? 1 : 2) extends <T>() => T extends Value ? 1 : 2 ? true : false; //========== applyPartial ========== This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters // Q: Why not an object literal? // A: Then you have to create separate constants for the symbols: // https://2ality.com/2025/01/typescript-enum-patterns.html#using-symbols-as-property-values type PropertyValues<Obj> = Obj[keyof Obj]; function createEnum<C extends new (...args: unknown[]) => unknown>(enumClass: C): Omit<C, 'prototype'> { return enumClass; } const Color = createEnum(class {
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