Trevor trevorhreed
trevorhreed
/ estate.js
Last active
October 7, 2024 16:53
A little state manager that does not scale. Uses localStorage and proxies.
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| export const encode = value => btoa(JSON.stringify(value)) | |
| export const decode = value => JSON.parse(atob(value)) | |
| export const save = (key, value) => localStorage.setItem(key, encode(value)) | |
| export const load = key => decode(localStorage.getItem(key) ?? btoa('{}')) | |
| export const estate = (state = {}, { | |
| localStorageKey = 'state', | |
| } = {}) => { | |
| const isProxy = Symbol('isProxy') | |
| const handler = { |
trevorhreed
/ DistributedS3LockService.java
Last active
August 22, 2023 21:40
A distributed mutex service that uses S3 to manage locks.
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| /* | |
| CRITIQUE: It's missing fences | |
| I need a distributed lock system for a service I'm writing. | |
| (There can be multiple instances of this service running at | |
| a time, and I need to make sure that only one instance does | |
| a particular cron job.) | |
| According to [this page](https://aws.amazon.com/s3/consistency/), |
trevorhreed
/ merge.js
Last active
July 1, 2023 05:49
A deep merge of options or configuration values
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| export const merge = (target, ...sources) => { | |
| target = { ...target } | |
| if (!sources.length) return target | |
| const source = sources.shift() | |
| for(const key in source) { | |
| const value = target[key] | |
| const isObject = value | |
| && typeof value == 'object' | |
| && !(value instanceof Date) | |
| && !(value instanceof RegExp) |
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| const diff = (a, b, path = '') => { | |
| let diffs = [] | |
| const { | |
| type: typeA, | |
| value: valueA | |
| } = diff.meta(a) | |
| const { | |
| type: typeB, | |
| value: valueB | |
| } = diff.meta(b) |
trevorhreed
/ format-phone-number.gs
Created
July 7, 2022 05:22
Format phone numbers in Google Sheets using Google App Sheet
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| function onOpen() { | |
| var ui = SpreadsheetApp.getUi() | |
| ui.createMenu('Utilities') | |
| .addItem('Format Phone Numbers', 'formatPhone') | |
| .addToUi(); | |
| } | |
| function formatPhone() { | |
| const range = SpreadsheetApp.getActive().getActiveRange() | |
| const values = range |
trevorhreed
/ command-line-args.js
Last active
January 20, 2022 23:34
Turns `process.argv` into an array-like object with fixed position arguments indexed by number and named arguments indexed by key.
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| /** | |
| * Simple command line argument parser | |
| * | |
| * An instance of Args is an array-like | |
| * object that contains a list of fixed | |
| * and named arguments | |
| * | |
| * Given command line args of: | |
| * | |
| * node args.js command -a --param=value |
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| { | |
| console.clear() | |
| ;(async function run() { | |
| copyMembersWithoutCallings() | |
| })() | |
| async function copyMembersWithoutCallings() { | |
| const urls = [ |
trevorhreed
/ worker-manager.ts
Created
January 12, 2021 01:20
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| export class UnitWorkerManager { | |
| private resolves = {} | |
| private rejects = {} | |
| private promiseId = 0 | |
| private worker | |
| constructor(scriptPath, opts) { | |
| this.worker = new Worker(scriptPath, opts) | |
| this.worker.addEventListener('message', data => { | |
| const { id, err, result } = data || {} |
trevorhreed
/ trigger-event-on-element-viewable.html
Last active
November 2, 2019 18:57
Capture event when elements scroll in and out of view
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| <!doctype html> | |
| <html> | |
| <head> | |
| <title>Test</title> | |
| <style type="text/css"> | |
| html{ | |
| margin: 20px; | |
| } | |
| #stats{ | |
| position: fixed; |
trevorhreed
/ pids.js
Created
December 4, 2018 17:04
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| console.clear() | |
| const Pid = (function(){ | |
| // UUID generator | |
| !function(n){"use strict";function e(){var e=n.crypto||n.msCrypto;if(!f&&e&&e.getRandomValues)try{var r=new Uint8Array(16);s=f=function(){return e.getRandomValues(r),r},f()}catch(n){}if(!f){var o=new Array(16);i=f=function(){for(var n,e=0;e<16;e++)0===(3&e)&&(n=4294967296*Math.random()),o[e]=n>>>((3&e)<<3)&255;return o},"undefined"!=typeof console&&console.warn&&console.warn("[SECURITY] node-uuid: crypto not usable, falling back to insecure Math.random()")}}function r(){if("function"==typeof require)try{var n=require("crypto").randomBytes;c=f=n&&function(){return n(16)},f()}catch(n){}}function o(n,e,r){var o=e&&r||0,t=0;for(e=e||[],n.toLowerCase().replace(/[0-9a-f]{2}/g,function(n){t<16&&(e[o+t++]=y[n])});t<16;)e[o+t++]=0;return e}function t(n,e){var r=e||0,o=v;return o[n[r++]]+o[n[r++]]+o[n[r++]]+o[n[r++]]+"-"+o[n[r++]]+o[n[r++]]+"-"+o[n[r++]]+o[n[r++]]+"-"+o[n[r++]]+o[n[r++]]+"-"+o[n[r++]]+o[n[r++]]+o[n[r++]]+o[n[r++]]+o[n[r++]]+o[n[r++]]}functi |
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