Giles Lavelle lavelle

Pure ESM package

The package that linked you here is now pure ESM. It cannot be require()'d from CommonJS.

This means you have the following choices:

Use ESM yourself. (preferred)
Use import foo from 'foo' instead of const foo = require('foo') to import the package. You also need to put "type": "module" in your package.json and more. Follow the below guide.
If the package is used in an async context, you could use await import(…) from CommonJS instead of require(…).
Stay on the existing version of the package until you can move to ESM.

type StringBool = "true"|"false";


interface AnyNumber { prev?: any, isZero: StringBool };
interface PositiveNumber { prev: any, isZero: "false" };

type IsZero<TNumber extends AnyNumber> = TNumber["isZero"];
type Next<TNumber extends AnyNumber> = { prev: TNumber, isZero: "false" };
type Prev<TNumber extends PositiveNumber> = TNumber["prev"];

This document has moved!

It's now here, in The Programmer's Compendium. The content is the same as before, but being part of the compendium means that it's actively maintained.

BEM Cheatsheet

BLOCK

Block encapsulates a standalone entity that is meaningful on its own.

While blocks can be nested and interact with each other, semantically they remain equal; there is no precedence or hierarchy.

Holistic entities without DOM representation (such as controllers or models) can be blocks as well.

Branch from an old commit

git branch branchname ref

where ref is either a sha (abcd123) or a pointer HEAD@{5}

Undo a commit

git reset HEAD~1

#Node - File Paths

##File Paths Node has a path module which can be used to manipulate paths.

###Normalizing Paths Paths can be stored in different ways and it is neccessary to ensure that the path is standardized.

var path = require('path');
path.normalize('/foo/bar//baz/asdf/quux/..');

Python Number Conversion Chart

From	To	Expression

	// Author: Giles
	const datetimeComponents = _(matchResults).tail().map(_.toNumber).value();

	// Better than
	var datetimeComponents = _.map(
	matchResults.slice(1, 6), // skip the matched result
	function(component) {
	return parseInt(component, 10);
	}
	);

	"""
	Turn a piano MIDI file into a basic 3D animated piano video.
	See the result here:


	I am leaving it as a script because it is not tested on enough MIDI files yet.

	Zulko 2014
	This script is released under a Public Domain (Creative Commons 0) licence.

	var empty_list = function(selector) {
	return selector(undefined, undefined, true);
	};

	var prepend = function(el, list) {
	return function(selector) {
	return selector(el, list, false);
	};
	};
	var head = function(list) {