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Exercise 2

Implement a solution.

Solution

We've chose to use a DFS recursive approach:

function hasPath(edgeList, src, dst) {
  const adjList = createAdjList(edgeList);
  const visited = new Set();

  function dfs(src, dst) {
    if (src === dst) {
      return true;
    }
    visited.add(src);
    for (const neighbor of adjList.get(src)) {
      if (!visited.has(neighbor)) {
        if (dfs(neighbor, dst)) {
          return true;
        }
      }
    }
    return false;
  }
  return dfs(src, dst);
}

function createAdjList(edgeList) {
  const adjList = new Map();

  edgeList.forEach(([vertex1, vertex2]) => {
    if (!adjList.has(vertex1)) adjList.set(vertex1, []);
    adjList.get(vertex1).push(vertex2);

    if (!adjList.has(vertex2)) adjList.set(vertex2, []);
    adjList.get(vertex2).push(vertex1);
  });

  return adjList;
}

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