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Interpolating between things using lerp.

function lerp (start, end, t) {
  return start * (1 - t) + end * t;
}

How to create an HTTPS certificate for localhost domains

This focuses on generating the certificates for loading local virtual hosts hosted on your computer, for development only.

Do not use self-signed certificates in production ! For online certificates, use Let's Encrypt instead (tutorial).

1. Configure server: Nginx

Create the certificate:

$ sudo openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /etc/ssl/private/nginx-selfsigned.key -out /etc/ssl/certs/nginx-selfsigned.crt

Create a strong Diffie-Hellman group:

$ sudo openssl dhparam -out /etc/ssl/certs/dhparam.pem 2048

Set the default size for new Docker for Mac disk images

UPDATE: The instructions here are no longer necessary! Resizing the disk image is now possible right from the UI since Docker for Mac Version 17.12.0-ce-mac49 (21995).

If you are getting the error: No space left on device

Configuring the qcow2 size cap is possible in the current versions:

# my disk is currently 64GiB

	import * as React from 'react';
	import { mount } from 'enzyme';
	import sinon from 'sinon';

	function isImageLoaded(img: HTMLImageElement) {
	return img.complete && img.naturalHeight > 0;
	}

	type Props = {
	src: string,

	//@flow
	import React, { Component } from 'react'
	import type { ElementRef } from 'react'

	type Props = { src: string, alt: string }

	type State = { source?: string }

	export default class LazyImage extends Component<Props, State> {
	state = {}


	'.source.go':
	'Options':
	'prefix': 'options'
	'body': '''
	// Option function.
	type Option func(*$1)

	// New with the given options.
	func New(options ...Option) *$1 {

	# do https://gist.github.com/jed/6147872 and then do this to proxy your app
	worker_processes 1;

	events {
	worker_connections 1024;
	}

	http {
	server {
	listen 80;

	// 🔥 Node 7.6 has async/await! Here is a quick run down on how async/await works

	const axios = require('axios'); // promised based requests - like fetch()

	function getCoffee() {
	return new Promise(resolve => {
	setTimeout(() => resolve('☕'), 2000); // it takes 2 seconds to make coffee
	});
	}

	docker logs nginx 2>&1 \| grep "127."

	# ref: http://stackoverflow.com/questions/34724980/finding-a-string-in-docker-logs-of-container