Aditya Agarwal itaditya

This API was removed in React 17

Interaction tracing with React

React recently introduced an experimental profiler API. After discussing this API with several teams at Facebook, one common piece of feedback was that the performance information would be more useful if it could be associated with the events that caused the application to render (e.g. button click, XHR response). Tracing these events (or "interactions") would enable more powerful tooling to be built around the timing information, capable of answering questions like "What caused this really slow commit?" or "How long does it typically take for this interaction to update the DOM?".

With version 16.4.3, React added experimental support for this tracing by way of a new NPM package, scheduler. However the public API for this package is not yet finalized and will likely change with upcoming minor releases, so it should be used with caution.

I bundled these up into groups and wrote some thoughts about why I ask them!

If these helped you, I'd love to hear about it!! I'm on twitter @vcarl_ or send me an email [email protected]

Onboarding and the workplace

https://blog.vcarl.com/interview-questions-onboarding-workplace/

How long will it take to deploy my first change? To become productive? To understand the codebase?
What kind of equipment will I be provided? Will the company pay/reimburse me if I want something specific?

Falsehoods programmers believe about time

This is a compiled list of falsehoods programmers tend to believe about working with time.

Don't re-invent a date time library yourself. If you think you understand everything about time, you're probably doing it wrong.

Falsehoods

There are always 24 hours in a day.
February is always 28 days long.
Any 24-hour period will always begin and end in the same day (or week, or month).

(also know as lies and/or alternative facts)

js

setImmediate - doesn't set anything immediately, waits for a tick before executing
setTimeout(fn, n) - never sets the timeout to exactly n
Math.random() - computers cannot generate random numbers
Promise - is a lie when rejected
Array.reduce - accumulates, does not reduce (via @sbmadhav)

	function withAuthentication(WrappedComponent) {
	const ModifiedComponent = (props) => {
	if (!props.isAuthenticated) {
	return <Redirect to="/login" />;
	}

	return (<WrappedComponent { ...props } />);
	};

	const mapStateToProps = (state) => ({

	import asyncio
	loop = asyncio.get_event_loop()

	async def hello():
	await asyncio.sleep(3)
	print('Hello!')

	if __name__ == '__main__':
	loop.run_until_complete(hello())

	package auth

	import (
	"context"
	"net/http"
	"strings"

	"google.golang.org/grpc/metadata"

	"github.com/andela/micro-api-gateway/pb/authorization"

	var Person = {
	init: function(name) {
	this.name = name;
	},
	doSomethingAndUseSpeak: function(text) {
	this.speak({name: this.name, text})
	}
	};

	var canSpeak = {

	// Usage:
	// in the mongo shell,
	// 'use' the database where the city data is loaded
	// and execute the following lines
	//
	//
	// load( "pathto/function.js");
	// db.cities.find().forEach( buildEdges );
	// findShortestPath();