Calculating Historical Volatility
Historical Volatility shows how volatile an asset has been. There are numerous ways of calculating it, and I will show the most simple one here. […]
Continue reading »Category: Development
The Builder Pattern
Reasoning I won’t even go into why you should learn patterns. Patterns are canned knowledge! A problem the Builder Pattern solve It helps you avoid […]
Continue reading »Adding Stripe Payments to your Rails application
If you need to process payments, for example charging the user for using your great new website, Stripe is a great contender. An alternative is […]
Continue reading »Setting up 1000 Devise user accounts using fixtures
Seting up a one Devise user (version 3.5.1 and later) is simple in file <app>/test/fixtures/users.yml: tom: id: 11 name: TestUser email: test@example.org encrypted_password: <%= Devise::Encryptor.digest(User, ‘password’) […]
Continue reading »IOS App that scrolls both vertically and horizontally
Great example on how you create a “Netflix-lookalike” app with scrolling in bort vertical and horizontal direction. https://github.com/ThornTechPublic/HorizontalScrollingCollectionView
Continue reading »Hibernate and Java annotations
So….. I wanted to use something as neat and powerful as Rails’ ActiveRecord. I had used hibernate a bit a long time ago, and frankly […]
Continue reading »CheatSheet for creating an XCode IOS app with a UITableView
Setup Create a standard ViewController (NOT a TableViewController!) Drag a Table onto the ViewController. Snap to edges, Reset to “Suggested Constraints”. Option Cmd Shift = […]
Continue reading »Javascript-länkar att lägga till samlingen
Om ‘use strict’: http://ejohn.org/blog/ecmascript-5-strict-mode-json-and-more/ Modular Javascript/CommonJS: https://addyosmani.com/writing-modular-js/ Babel: Code for ES6 and still be backwards compatible with older browsers: https://babeljs.io JSX In depth: http://facebook.github.io/react/docs/jsx-in-depth.html
Continue reading »Facebook React Native
Det finns flera ramverk som ger möjlighet att skriva appar i Javascript, och sedan kompilera dem för den målmiljö man är intresserad av (oftast iOS […]
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