zachvictor’s gists

zachvictor / iterate_collection.py

Last active March 12, 2025 20:55

Python generator to iterate any sequence or mapping (list, dict, etc.) as (key/index, value) pairs

	from collections.abc import Mapping, Sequence
	from typing import Any, Iterator, Protocol, Tuple, TypeVar, runtime_checkable

	K = TypeVar('K') # Key type for mappings
	V = TypeVar('V') # Value type


	@runtime_checkable
	class SupportsItems(Protocol[K, V]):
	def items(self) -> Iterator[Tuple[K, V]]: ...

zachvictor / compactify.js

Last active October 11, 2022 22:19

JSON stringify function that compacts numeric arrays, putting brackets and values on the same line

	function compactify(ugly) {
	// Step 1: JSON stringify with indentation (4 spaces)
	const first_pass = JSON.stringify(JSON.parse(ugly), null, 4)

	// Step 2: Put comma-sep. numbers on same line
	const comma_num_newline_ptn = /,\n +((\d\.)?\d+)/g
	const num_same_line = first_pass.replace(comma_num_newline_ptn, ', $1')

	// Step 3: Put flat arrays on same line
	const flat_array_ptn = /\[\n\s+(([\d.]+, )+[\d.]+)\n\s+\]/g

zachvictor / empty-array-json.go

Last active July 27, 2022 19:30

Empty JSON array via Go json.Marshal or []byte literal

	package main

	import (
	"encoding/json"
	"fmt"

	"github.com/kr/pretty"
	)

	func main() {

zachvictor / urtype.js

Last active July 11, 2021 10:38

urtype() is a one-line wrapper for Object.prototype.toString.call() that extracts the second word as the "urtype" (Anglophone misappropriation of Germanic prefix -- guilty as charged)

	const urtype = (x) => Object.prototype.toString.call(x).split(' ')[1].slice(0, -1)

	// examples
	[
	['undefined primitive', undefined],
	['undefined via void operator', void ''],
	['null', null],
	['boolean primitive', true],
	['number primitive', 123],
	['string primitive', 'I feel pretty'],

zachvictor / cal.sql

Created January 29, 2021 02:42

PostgreSQL query to generate a calendar

	-- Generate a calendar in PostgreSQL

	-- Rather than create a calendar table and insert rows into it statically,
	-- this approach materializes a recursive [iterative] query.

	CREATE MATERIALIZED VIEW cal AS
	WITH RECURSIVE dd(d) AS (
	VALUES ('2005-01-01'::DATE)
	UNION ALL
	SELECT d + 1

zachvictor / query_selector_fn_alias.js

Last active August 19, 2020 09:06

Alias querySelector and querySelectorAll (for console debugging, etc.)

	Object.getOwnPropertyNames(window).filter(name => name.match(/^HTML[a-zA-Z]*Element$/)).forEach(h => {
	[{abbr: 'qs', name: 'querySelector'}, {abbr: 'qsa', name: 'querySelectorAll'}].forEach(fn => {
	try {
	window[h]['prototype'][fn.abbr] = window[h]['prototype'][fn.name]
	console.log(`${h}: added alias ${fn.abbr} for ${fn.name} method.`)
	} catch (e) {
	console.log(`${h} has no ${fn.name} method.`, e.message)
	}
	})
	})

zachvictor / iframe_killer.js

Last active August 17, 2020 04:59

JavaScript for browser console kills on page iframes + uses MutationObserver to kill new iframes

	(function () {

	function __kill_added_iframe_mutob_callback(mList, ob){
	const addedNodesToRemove = []
	mList.forEach(mRec => {
	mRec.addedNodes.forEach(addedNode => {
	if (addedNode.tagName.match(/^iframe$/i)) {
	addedNodesToRemove.push(addedNode)
	}
	})

zachvictor / CoolorsPalette.js

Last active February 1, 2020 08:49

Translate Coolors.co palette to hex and rgb values in JavaScript/JSON object

	var cp = (function () {
	class CoolorsPalette {
	constructor() {
	// Row spans all palette columns: i.e., one shade of each color
	this.rows = Array.from(document.querySelectorAll('#palette-shades div.palette-shades-row'))
	const numCols = this.rows[0].querySelectorAll('div.palette-shades-col').length
	this.colors = Array(numCols).fill([])
	this.rows.forEach(row => {
	Array
	.from(row.querySelectorAll('div.palette-shades-col'))

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