Introduction
We give a quick introduction to Ledger itself and to the Mac app we're going to build.
Episode 10 · Aug 12 2016
Ledger Mac App
Ledger is a popular command-line accounting system that we use for all our bookkeeping. While we love the text-based nature of it, we wanted to build a simple GUI around it to get better visibility into our data. Along with the basic AppKit shell, this project uses lots of functional parsing and evaluation code.
9 Episodes · 3h09min
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1.
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2.
Evaluating Expressions
Expressions are at the heart of Ledger. We write an evaluator for this expression language in a test-driven way.
Episode 11 · Aug 12 2016
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3.
Evaluating Transactions
Writing the code for evaluating transactions required continuous refactoring to keep our code simple and clean.
Episode 12 · Aug 19 2016
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Parsing Techniques
We look at two different techniques to parse a simple expression language: handwritten parsers and parser combinators.
Episode 13 · Aug 26 2016
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Growing Trees with Classes and Structs
We build a tree structure from an array of Ledger account names. We first implement the tree using a class, and then we refactor it to a struct and discuss the differences and tradeoffs involved.
Episode 14 · Sep 02 2016
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Building Parser Combinators (Part 1)
Join us in the functional programming gym to stretch your object-oriented comfort zone while we lay the groundwork for a parser combinator library.
Episode 15 · Sep 09 2016
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7.
Building Parser Combinators (Part 2)
We implement some of the more challenging parts of parser combinators.
Episode 16 · Sep 16 2016
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Architecture
We connect multiple view controllers using a coordinator and callback functions. We simplify the control flow by refactoring the UI state into its own struct.
Episode 17 · Sep 23 2016
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9.
Adding Search
We leverage the existing infrastructure of our app to add a search field with very little code.
Episode 18 · Sep 30 2016