Rafael Santos Sá fael

A series of posts on css-in-js

0. styles as objects

First, an exercise. Can we represent all of css with plain data? Let's try.

let redText = { color: 'red' };

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

General rules

Follow standard conventions.
Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
Boy scout rule. Leave the campground cleaner than you found it.
Always find root cause. Always look for the root cause of a problem.

Design rules

From zero to microservice with 𝚫 now

The following guide will show you how to deploy a simple microservice written in JavaScript using 𝚫 now.

It uses Open Source tools that are widely available, tested and understood:

Node.JS
NPM
Express

	//@version=4
	study(title="CTO Line", shorttitle="CTO", overlay=true, resolution="")
	smma(src, length) =>
	smma = 0.0
	smma := na(smma[1]) ? sma(src, length) : (smma[1] * (length - 1) + src) / length
	smma
	v1 = smma(hl2, 15)
	m1 = smma(hl2, 19)
	m2 = smma(hl2, 25)
	v2 = smma(hl2, 29)

	import * as path from "https://deno.land/[email protected]/path/mod.ts";
	import * as fs from "https://deno.land/[email protected]/fs/mod.ts";
	import { paramCase } from "https://deno.land/x/[email protected]/mod.ts";

	const cwd = Deno.cwd();

	// Files to be excluded during the walk
	const skip = (await Deno.readTextFile(path.join(cwd, ".gitignore")))
	.replace(/#.*/g, "")
	.replace(/\s*\n/g, "\n")

	import { useState, useMemo, useEffect } from "react";
	import { interpret } from "xstate/lib/interpreter";

	export default function useMachine(machine, { log = false } = {}) {
	const [current, setCurrent] = useState(machine.initialState);

	const service = useMemo(() => interpret(machine), []);

	useEffect(() => {
	service.onTransition(setCurrent).start();

	export class MyComponent extends React.Component {
	componentWillMount() {
	const styleid = 'MyComponentStyles'
	if (document.head.querySelector(`#${styleid}`) !== null) {
	const styles = document.createElement('style');
	styles.id = styleid;
	styles.append('[foo]{ color: blue; }');
	document.head.appendChild(styles);
	}
	}

	import React, { Component } from 'react';
	import PropTypes from 'prop-types';
	import { connect } from 'react-redux';

	import {
	extractClockTimestamp,
	} from './reduxClockReducer';

	import {
	ACTION_CLOCK_SUBSCRIBE,

	/*
	New Relic GPT ad monitoring code
	//
	This snippet captures PageActions containing references to Google publisher tag ads
	Should you have any questions about this, please reach out to me at [email protected]
	Please note that you must be using New Relic's SPA browser agent.
	//
	*/
	//
	//first, make sure the newrelic object exists properly