BFS unwrapping in a single place

Author: Chris Pilcher

Breadth-First Search/BreadthFirstSearch.playground/Contents.swift

@@ -84,8 +84,8 @@ func breadthFirstSearch(graph: Graph, source: Node) {
  queue.enqueue(source)
 
  while !queue.isEmpty {
- let current = queue.dequeue()
- for edge in current!.neighbors {
+ let current = queue.dequeue()!
+ for edge in current.neighbors {
  let neighborNode = edge.neighbor
  if !seenNodes.contains(neighborNode) {
  queue.enqueue(neighborNode)

Breadth-First Search/README.markdown

@@ -66,8 +66,8 @@ func breadthFirstSearch(graph: Graph, source: Node) {
  queue.enqueue(source)
 
  while !queue.isEmpty {
- let current = queue.dequeue()
- for edge in current!.neighbors {
+ let current = queue.dequeue()!
+ for edge in current.neighbors {
  let neighborNode = edge.neighbor
  if !seenNodes.contains(neighborNode) {
  queue.enqueue(neighborNode)