rcholic

iOS Topic Questions

(from https://courses.codepath.com/courses/intro_to_ios/pages/ios_topic_questions)

Below you'll find questions that you should be able to answer after taking the iOS class. Some questions are commonly used in iOS interviews.

Views

• What properties of a view can be animated? (source: https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/CoreAnimation_guide/AnimatableProperties/AnimatableProperties.html) name a few: anchorPoint, backgroundColor, borderColor, borderWidth, contents, frame, mask, transform, zPosition

• What is a CALayer? (source: https://www.raywenderlich.com/2502/calayers-tutorial-for-ios-introduction-to-calayers-tutorial)

rcholic

Kafka in Docker in Vagrant

I'm using this Vagrantfile to run Kafka on a Windows 8.1 laptop for development purposes.

It runs the ultra-lightweight boot2docker Linux, then uses Vagrant's Docker provisioning support to spin up ZooKeeper and Kafka.

The fun bits to work out were:

• You need to forward the ports on both Vagrant (lines 13 & 14) and Docker (the -p flag), so you can access the instance from Windows using localhost:9092

rcholic

Kafka in Docker in Vagrant

I'm using this Vagrantfile to run Kafka on a Windows 8.1 laptop for development purposes.

It runs the ultra-lightweight boot2docker Linux, then uses Vagrant's Docker provisioning support to spin up ZooKeeper and Kafka.

The fun bits to work out were:

• You need to forward the ports on both Vagrant (lines 13 & 14) and Docker (the -p flag), so you can access the instance from Windows using localhost:9092

rcholic

Cracking the coding interview, careercup

Data Structures

   1. Integer
      – find number of 1s
      – next largest smaller
      – smallest larger number
      – determine if is palindrom
      – itoa, atoi

rcholic

1. The Layer Tree

Core Animation's original name is Layer Kit

Core Animation is a compositing engine; its job is to compose different pieces of visual content on the screen, and to do so as fast as possible. The content in question is divided into individual layers stored in a hierarchy known as the layer tree. This tree forms the underpinning for all of UIKit, and for everything that you see on the screen in an iOS application.

In UIView, tasks such as rendering, layout and animation are all managed by a Core Animation class called CALayer. The only major feature of UIView that isn’t handled by CALayer is user interaction.

There are four hierarchies, each performing a different role:

• view hierarchy
• layer tree

rcholic

// Swift 2.2 syntax / API

import UIKit

extension UIBezierPath {

    class func arrow(from start: CGPoint, to end: CGPoint, tailWidth: CGFloat, headWidth: CGFloat, headLength: CGFloat) -> Self {
        let length = hypot(end.x - start.x, end.y - start.y)
        let tailLength = length - headLength

rcholic

version: '2'
services:
  MongoDB:
    image: mongo
    container_name: mongo
    volumes:
      - ./_mongo_data:/data/db
    networks:
      - backend

rcholic

Deploying Parse Server on AWS

Note: this is a work-in-progress and will be updated with more information over the next few days.

Intro

This guide will walk you through deploying your own instance of the open-source Parse Server. This would be a good starting point for testing your existing application to see if the functionality provided by the server is enough for your application, and to potentially plan your migration off the Parse Platform.

This guide will walk you through using Elastic Beanstalk (EB), which is an AWS service similar to Heroku. Why use EB rather than Heroku? Elastic Beanstalk does not lock you into Heroku-specific ways of doing things, is likely cheaper to run your backend on than Heroku, and it integrates with other services that AWS offer (and they offer almost everything one needs to run an application these days).

rcholic

//
//  BuildTimelapseViewController.swift
//
//  Created by Adam Jensen on 5/9/15.
//

import JGProgressHUD
import JoePro
import UIKit

rcholic

var Col = require('react-bootstrap/lib/Col')
var PageHeader = require('react-bootstrap/lib/PageHeader')
var React = require('react')
var Row = require('react-bootstrap/lib/Row')
var {connect} = require('react-redux')
var {reduxForm} = require('redux-form')

var DateInput = require('./DateInput')
var FormField = require('./FormField')
var LoadingButton = require('./LoadingButton')