Create Tree, JS version

treecreator.js

//following adapted from https://stackoverflow.com/a/44185784/263398
var data2 = [{
        name: "Children C1",
        paths: [["A", "B", "C"],["A", "B"]]
    }, {
        name: "Children C2",
        paths: [["A", "B", "C"]]
    }, {
        name: "Children C3",
        paths: [["A", "B", "C"]]
    }, {
        name: "Children B1",
        paths: [["A", "B"],["C"]]
    }, {
        name: "Children B2",
        paths: [["A", "B"],["D", "E"],["X"]]
    }, {
        name: "Children A1",
        paths: [["A"],["B"]]
    }, {
        name: "Children E1",
        paths: [["D", "E"],["A", "B"]]
    }];

var tree2 = function(comments) {
        var result = [],
            initialValue = {
                _: result
            };

        comments.forEach(function(comment) {

            //The accumulator = it is the accumulated value previously returned in the last invocation of the callback

			comment.paths.forEach(function(path){
				console.log(path)

				path.concat(comment.name).reduce(function(accumulator, pathpart, currentIndex, array) {
					console.log("pathpart", pathpart)
	                if (!accumulator[pathpart]) {
						console.log("IF!")
	                    accumulator[pathpart] = {
	                        _: []
	                    };
	                    accumulator._.push({
	                        name: pathpart,
	                        children: accumulator[pathpart]._
	                    });
	                }
	                //with every reduce step the nesting goas one level further down, since not the accumulator is returned, but its current next child object
					console.log("accumulator")
	                return accumulator[pathpart];
	            }, initialValue);
	        });
		});
	return result;
}(data2);