Saajan Saajan

Stuff I wish I'd known sooner about service workers

I recently had several days of extremely frustrating experiences with service workers. Here are a few things I've since learned which would have made my life much easier but which isn't particularly obvious from most of the blog posts and videos I've seen.

I'll add to this list over time – suggested additions welcome in the comments or via twitter.com/rich_harris.

Use Canary for development instead of Chrome stable

~~Chrome 51 has some pretty wild behaviour related to console.log in service workers. Canary doesn't, and it has a load of really good service worker related stuff in devtools.~~

Installing `pyenv` on macOS for Zsh using Homebrew

Published May-13-2020

Installation
Basic Usage
Virtualenv

ZIP

zip -r directory.zip directory

ZIP WITHOUT ROOT FOLDER cd directory;zip -r ../directory.zip .

disk space in partition

To connect to Postgres you could use a database tool like DBeaver or from the command line, running this command:

$ docker ps -f "name=postgres"

-f: Filter output based on conditions provided

To get the CONTAINER_ID of the running container, and execute

$ docker exec -it /bin/bash

How to Setup Node and Express on Amazon Web Services EC2

Make an account on Amazon Web Services http://aws.amazon.com/
Create a vanilla Ubuntu micro EC2 instance
Security Open HTTP, HTTPS, Port 8080, and Port 9000

forEach is the "loop through them all" function, but ES5 defined several other useful "work your way through the array and do things" functions, including:

every-- (stops looping the first time the iterator returns false or something falsey)
some-- (stops looping the first time the iterator returns true or something truthy)
filter-- (creates a new array including elements where the filter function returns true and omitting the ones where it returns false)
map --(creates a new array from the values returned by the iterator function)
reduce-- (builds up a value by repeated calling the iterator, passing in previous values;see the spec for the details; useful for summing the contents of an array and many other things)
reduceRight-- (like reduce, but works in descending rather than ascending order)

	ls -al ~/.ssh
	# Lists the files in your .ssh directory, if they exist

	#With Terminal still open, copy and paste the text below. Make sure you substitute in your GitHub email address.

	! ssh-keygen -t rsa -b 4096 -C "your_email@example.com"
	# Creates a new ssh key, using the provided email as a label
	# Generating public/private rsa key pair.
	# We strongly suggest keeping the default settings as they are, so when you're prompted to "Enter a file in which to save the key", just press Enter to continue.

	function toObject(arr) {
	var obj = {};
	for (var i = 0; i < arr.length; ++i)
	obj[i] = arr[i];
	return obj;
	}

	for (var j = 0; j < 10; j++) {
	setTimeout(function (index) {
	console.log(index);
	}.bind(null, j), 0);
	}


	for (let j = 0; j < 10; j++) {
	setTimeout(function () {
	console.log(j);

	var userAgent = navigator.userAgent.toLowerCase(),
	browser = '',
	version = 0;

	$.browser.chrome = /chrome/.test(navigator.userAgent.toLowerCase());

	// Is this a version of IE?
	if ($.browser.msie) {
	userAgent = $.browser.version;
	userAgent = userAgent.substring(0,userAgent.indexOf('.'));