JS HL7 dicitonanry parsing

var HL7Dictionary = require('hl7-dictionary');
    
// Use v 2.4 dictionnary
var dictionary = HL7Dictionary.definitions['2.4'];

// lookup each kind of message
var msgArray = Object.keys(dictionary.messages).map(function(key){ return dictionary.messages[key]; });
msgArray.forEach(message => {
    console.log("Message " + message.name + " - " + message.desc);
    
    // For a message, lookup each segment
    var segments = message.segments;
    segments.segments.forEach(segment => {

        console.log("\tSegment " + segment.name);

        // For each segment, lookup fields
        if (dictionary.segments[segment.name]) {
            dictionary.segments[segment.name].fields.forEach(function(sequence, i) {
                console.log("\t\tField " + segment.name + "-" + (i+1) + " " + sequence.desc);

                // IF the field is a complex one, lookup its subfields
                if (dictionary.fields[sequence.datatype] && dictionary.fields[sequence.datatype].subfields.length >0) {
                    var field = dictionary.fields[sequence.datatype];
                    field.subfields.forEach(function(subfield, j) {
                        console.log("\t\t\t" + segment.name + "-" + (i+1) + "-" + (j+1) + " " + subfield.desc);
                    });
                }
            });
        }
    });
});