How to add Json items using forEach loop?

Question

This is part of GoJS (diagramming) project and "properties" is itemArray, which is defined inside of one node in diagram.

1) This works (hard coded values):

properties: [
    { "property_name": "Prop1", "property_value": "100"},
    { "property_name": "Prop2", "property_value": "101" },
    { "property_name": "Prop3", "property_value": "102" }
]

2) This doesn't work (from data source):

properties: [
    data.ObjectPropertiesList.forEach(function (item, i) {
        properties.push({ "property_name": item.Item1.toString(), "property_value": item.Item2.toString() });
    })
]

2.1) With surrounding code:

myPalette.model = new go.GraphLinksModel([
    { key: "B", text: "some block", color: "blue" },
    { key: "G", text: "Macro", isGroup: true },
    { category: "circle", key: "Gc", text: "A", color: "black", group: "G", loc: "0 0" },
    {
        category: "table", key: "Ga", group: "G", loc: "60 0",
        properties: [
            data.ObjectPropertiesList.forEach(function (item, i) {
                properties.push({ "property_name": item.Item1.toString(), "property_value": item.Item2.toString() });
            })
        ]
    }
], [
    { from: "Gc", to: "Ga" }
]);

Answer 1

Why pushing data inside var declaration ? just declare your array then push values , see below working snippet

 var data= {}; data.ObjectPropertiesList = [ {Item1:"Prop1",Item2:"100"}, {Item1:"Prop2",Item2:"101"}, {Item1:"Prop3",Item2:"102"}, ] properties = []; data.ObjectPropertiesList.forEach(function (item, i) { properties.push({ "property_name": item.Item1.toString(), "property_value": item.Item2.toString() }); }) console.log(properties); 

Answer 2

var properties = [];
for(var i=0; i < data.length; i++){
    var item = data[i];
    properties.push({ 
        "property_name": item.Item1.toString(), 
        "property_value": item.Item2.toString() 
    })
}

Answer 3

Don't use forEach when you want map :

properties: data.ObjectPropertiesList.map(function (item) {
    return { "property_name": item.Item1.toString(), "property_value": item.Item2.toString() };
})