Dijkstra algoritm implementation in Swift

Hello every one,

Here is an implementation for the Dijkstra algorithm in Swift that helps you get the shortest path from node_A to node_B of grid of connected nodes.

The algorithm is as below:

Foreach node set distance[node] = HIGH
SettledNodes = empty
UnSettledNodes = empty

Add sourceNode to UnSettledNodes
distance[sourceNode]= 0

while (UnSettledNodes is not empty) {
  evaluationNode = getNodeWithLowestDistance(UnSettledNodes)
  remove evaluationNode from UnSettledNodes 
    add evaluationNode to SettledNodes
    evaluatedNeighbors(evaluationNode)
}

getNodeWithLowestDistance(UnSettledNodes){
  find the node with the lowest distance in UnSettledNodes and return it 
}

evaluatedNeighbors(evaluationNode){
  Foreach destinationNode which can be reached via an edge from evaluationNode AND which is not in SettledNodes {
    edgeDistance = getDistance(edge(evaluationNode, destinationNode))
    newDistance = distance[evaluationNode] + edgeDistance
    if (distance[destinationNode]  > newDistance) {
      distance[destinationNode]  = newDistance 
      add destinationNode to UnSettledNodes
    }
  }
} 

You can get a code example from this link:
https://github.com/ahmad3ttallah/DijkstraAlgorithm