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@getify
getify / 1-CalendarItem.js
Last active March 21, 2024 09:11
an illustration (non-trivial example) of many newer JS class features
// abstract class, not intended to be instantiated directly
class CalendarItem {
static #UNSET = Symbol("unset")
static #isUnset(v) {
return v === this.#UNSET;
}
static {
for (let [idx,msg] of [
"ID is already set.",
"ID is unset.",
@caseywatts
caseywatts / bookmarkleting.md
Last active November 14, 2024 13:23
Making Bookmarklets

This is one chapter of my "Chrome Extension Workshops" tutorial, see the rest here: https://gist.github.com/caseywatts/8eec8ff974dee9f3b247

Unrelated update: my book is out! Debugging Your Brain is an applied psychology / self-help book

Making Bookmarklets

I'm feeling very clever. I've got this sweet line of javascript that replaces "cloud" with "butt". My mom would LOVE this, but she doesn't computer very well. I'm afraid to show her the Developer Console and have her type/paste this in. But she IS pretty good at bookmarks, she knows just how to click those!

A bookmark normally takes you to a new web page. A bookmarklet is a bookmark that runs javascript on the current page instead of taking you to a new page. To declare that it is a bookmarklet, the "location" it points to starts with javascript:.