VStackable

The Two Sum Problem

Part 1: A Swifty Solution

Here’s the problem.

Given an array of numbers, say [2,3,3,4,5,6] and a target number, say 9, how can you find the two numbers that equal 9, then return the array indexes of the two values.

Using Map to find Values in an Array

or, doing the absolute minimum

Software rots if left alone

recompiling an app…

Some and None of Optional Optionals.

I came across this fun example of using Lists, Bindings and Optionals on X this morning.

Generics, Opaque Types, Boxed Types

a few explanatory drawings

Generics

Collections in Swift

you should be able to draw this from memory

The Most Important Sentences

in Advanced Swift

(Advanced Swift is a great book from Objc.io. Highly recommended.)

1 When we’re using a protocol like a concrete type, the compiler creates a wrapper type for the protocol, called an existential, behind the…

Binary Tree with Generics using Enum

including an Addnode func in the Eidhof example from Advanced Swift.

Deep in reading Eidhof’s examples and dug into this Binary Search tree. I read through all of Sedgewick years ago but in general I live in the land of making Apps and…