The other day, in JavaScript, I wrote some code that required three nested for-loops in order to locate data for consumption. The JavaScript code looked something like this:

screens.forEach(
( screen ) => {

	screen.conversations.forEach(
		( conversation ) => {

			conversation.comments.forEach(
				( comment ) => {

					doSomethingWith( screen, conversation, comment );

				}
			);

		}
	);

}

);
view rawsnippet-1.js hosted with ❤ by GitHub
This is hella ugly; and, on some level, “feels wrong” in a way that I can’t fully articulate. As such, I thought it would be a fun to try and figure out a way to encapsulate this nested looping using some sort of a “Visitor” Function. Meaning, create an algorithm that takes an object graph and an operator and then have it invoke said operator for each desired leaf-node within the graph.

#coldfusion #cfml #function