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<h1><a href="../../index.html">All files</a> / <a href="index.html">algorithms/depth-first-search</a> depthFirstSearch.js</h1>
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* @typedef {Object} Callbacks
*
* @property {function(vertices: Object): boolean} [allowTraversal] -
* Determines whether DFS should traverse from the vertex to its neighbor
* (along the edge). By default prohibits visiting the same vertex again.
*
* @property {function(vertices: Object)} [enterVertex] - Called when DFS enters the vertex.
*
* @property {function(vertices: Object)} [leaveVertex] - Called when DFS leaves the vertex.
*/
&nbsp;
/**
* @param {Callbacks} [callbacks]
* @returns {Callbacks}
*/
function initCallbacks(callbacks = {}) {
const initiatedCallback = callbacks;
&nbsp;
const stubCallback = () =&gt; {};
&nbsp;
const allowTraversalCallback = (
() =&gt; {
const seen = {};
return ({ nextVertex }) =&gt; {
if (!seen[nextVertex.getKey()]) {
seen[nextVertex.getKey()] = true;
return true;
}
return false;
};
}
)();
&nbsp;
initiatedCallback.allowTraversal = callbacks.allowTraversal || allowTraversalCallback;
initiatedCallback.enterVertex = callbacks.enterVertex || stubCallback;
initiatedCallback.leaveVertex = callbacks.leaveVertex || stubCallback;
&nbsp;
return initiatedCallback;
}
&nbsp;
/**
* @param {Graph} graph
* @param {GraphVertex} currentVertex
* @param {GraphVertex} previousVertex
* @param {Callbacks} callbacks
*/
function depthFirstSearchRecursive(graph, currentVertex, previousVertex, callbacks) {
callbacks.enterVertex({ currentVertex, previousVertex });
&nbsp;
graph.getNeighbors(currentVertex).forEach((nextVertex) =&gt; {
if (callbacks.allowTraversal({ previousVertex, currentVertex, nextVertex })) {
depthFirstSearchRecursive(graph, nextVertex, currentVertex, callbacks);
}
});
&nbsp;
callbacks.leaveVertex({ currentVertex, previousVertex });
}
&nbsp;
/**
* @param {Graph} graph
* @param {GraphVertex} startVertex
* @param {Callbacks} [callbacks]
*/
export default function depthFirstSearch(graph, startVertex, callbacks) {
const previousVertex = null;
depthFirstSearchRecursive(graph, startVertex, previousVertex, initCallbacks(callbacks));
}
&nbsp;</pre></td></tr></table></pre>

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