(Node.js) Traverse Direct Children via FirstChild / NextSibling, or LastChild / PreviousSibling

Demonstrates some ways to iterate over direct child nodes using the FirstChild / NextSibling and LastChild / PreviousSibling methods.

The input XML, available at http://www.chilkatsoft.com/data/fruit.xml, is this:

<root>
    <fruit color="red">apple</fruit>
    <fruit color="green">pear</fruit>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <fruit color="purple">grape</fruit>
    <cheese color="yellow">cheddar</cheese>
</root>

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

    var xml = new chilkat.Xml();
    // child: Xml
    var child;
    // nextSibling: Xml
    var nextSibling;
    // prevSibling: Xml
    var prevSibling;

    var success = xml.LoadXmlFile("qa_data/xml/fruit.xml");
    if (success !== true) {
        console.log(xml.LastErrorText);
        return;
    }

    // Iterate over the direct children by using FirstChild / NextSibling
    child = xml.FirstChild();
    var bContinue = xml.LastMethodSuccess;
    while ((bContinue == true)) {
        console.log(child.Tag + " : " + child.Content);
        nextSibling = child.NextSibling();
        bContinue = child.LastMethodSuccess;

        child = nextSibling;
    }

    console.log("-----");

    // Do the same, but with FirstChild2 / NextSibling2 to avoid
    // creating so many XML object instances:
    success = xml.FirstChild2();
    while (success == true) {
        console.log(xml.Tag + " : " + xml.Content);
        success = xml.NextSibling2();
    }

    // Revert back up to the parent:
    success = xml.GetParent2();

    console.log("-----");

    // Iterate in reverse order using LastChild / PreviousSibling
    child = xml.LastChild();
    bContinue = xml.LastMethodSuccess;
    while ((bContinue == true)) {
        console.log(child.Tag + " : " + child.Content);
        prevSibling = child.PreviousSibling();
        bContinue = child.LastMethodSuccess;

        child = prevSibling;
    }

    console.log("-----");

    // Do the same, but with LastChild2 / PreviousSibling2 to avoid
    // creating so many XML object instances:
    success = xml.LastChild2();
    while (success == true) {
        console.log(xml.Tag + " : " + xml.Content);
        success = xml.PreviousSibling2();
    }

    // Revert back up to the parent:
    success = xml.GetParent2();

}

chilkatExample();