Matt Lockyer mattlockyer

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PRs with comments > Issues; Active on Twitter; Bad response time to TG or LinkedIn DMs.

mattlockyer / sane-localStorage.js

Last active January 14, 2021 03:46

Sane localStorage wrappers for JSON

	export const get = (k, d = {}) => {
	let v = localStorage.getItem(k)
	try {
	return JSON.parse(v \|\| JSON.stringify(d))
	} catch (e) {
	return v
	}
	}
	export const set = (k, v) => localStorage.setItem(k, typeof v === 'string' ? v : JSON.stringify(v))
	export const del = (k) => localStorage.removeItem(k)

mattlockyer / check-hash.js

Created September 21, 2020 00:31

Check a NEAR contract hash using near-api-js

	import * as nearlib from 'near-api-js'
	const contractBytes = await fetch('./contract.wasm').then((r) => r.arrayBuffer())
	const hash = await crypto.subtle.digest('SHA-256', contractBytes)
	const hash58 = nearlib.utils.serialize.base_encode(hash)
	console.log(hash58)

mattlockyer / App.js

Last active September 27, 2020 23:53

React useContext, state, dispatch with thunk for namespaced state management

	import React, { useContext, useEffect } from 'react';
	import { store } from './state/store';
	import { onMount } from './state/test';

	const ExampleComponent = () => {
	const { state, dispatch, update: updateStore } = useContext(store)
	console.log(state)
	const update = async () => {
	// dispatch thunk wraps function with state, dispatch
	const res = await dispatch(initNear())

mattlockyer / app.js

Last active May 26, 2020 15:52

Javascript Mutex to prevent re-entry from multiple method calls. Protect methods that modify app, localStorage or IndexedDB.

	import { lock, unlock } from './mutex.js'

	async function processCallsLikeQueue() {
	// stop method calls here
	await lock('processCallsLikeQueue()')
	// ...
	// code to protect from re-entry
	// i.e. prevent multiple simultaneous calls to this part of the code
	// ...
	// let next method call in

mattlockyer / docker.txt

Last active May 21, 2020 20:09

Docker notes if having trouble starting, manual, killing, etc...

	# start docker manually
	sudo rm -rf /var/run/docker.pid; sudo dockerd &

	# kill all docker ps
	ps axf \| grep docker \| grep -v grep \| awk '{print "kill -9 " $1}' \| sudo sh

	# restart as service
	sudo systemctl restart docker

	# build docker

mattlockyer / keybindings.json

Created May 13, 2020 00:57

Keyboard shortcuts for vs code

	[
	{
	"key": "ctrl+]",
	"command": "workbench.action.terminal.focusNext"
	},
	{
	"key": "ctrl+[",
	"command": "workbench.action.terminal.focusPrevious"
	},
	{

mattlockyer / contraints.sql

Created May 11, 2020 18:56

Postgres - get constraints from table

	SELECT con.*
	FROM pg_catalog.pg_constraint con
	INNER JOIN pg_catalog.pg_class rel ON rel.oid = con.conrelid
	INNER JOIN pg_catalog.pg_namespace nsp ON nsp.oid = connamespace
	WHERE
	nsp.nspname = '<schema name>'
	AND rel.relname = '<table name>';

	/* from: https://dba.stackexchange.com/a/214877/187757 */

mattlockyer / rename.sh

Created April 30, 2020 23:40

Rename all files of a type in a folder with a sequential number scheme

	a=1
	for i in *.jpg; do
	new=$(printf "%04d.jpg" "$a") #04 pad to length of 4
	mv -i -- "$i" "$new"
	let a=a+1
	done

	# from https://stackoverflow.com/a/3211670/1060487

mattlockyer / ebay-scrape.js

Created April 9, 2020 22:18

Scrapes Ebay Prices


	const cheerio = require('cheerio')
	const request = require('request');

	let query = process.env.QUERY
	if (!query) {
	console.log('Please define an ENV var for QUERY="..."')
	return -1
	}
	query = encodeURIComponent(query)

mattlockyer / countries.json

Created February 24, 2020 17:58

Country Code to Country Name, Unicode and Flag Emoji