GoJS tutorial part 3, listing 2

diagram.js

var initDiagram = function () {
    diagram = $(go.Diagram, 
        'diagram-content', {
            initialContentAlignment: go.Spot.Center,
            allowDrop: true
    });
    // ...  
}
var initPalette = function () {
    palette = $(go.Palette, 'palette-content');
    getTemplates().forEach(x => palette.nodeTemplateMap.add(x.category, x.template));
    palette.model.nodeDataArray = [
        {key: 1, category: 'first'},
        {key: 2, category: 'second'},
        {key: 3, category: 'third'}
    ]
}