Append or replace a value on an object, using a specified key, if the value is not null. This is a very useful companion to the getProp() utility.

Note: object that is passed in is cloned before the property is appended.

Allows for code like:

let model = {
 item: {
   title: 'some example object',
   description: 'this is some longer text',
   type: 'Web Map',
   properties: {
     sourceId: '3ef'
   }
 },
 data: {
   theme: 'orange',
   parcelLayer: {
     primaryField: 'PIN'
   }
 }
};

// Let's extract some details into an object.
const summary = [
 'item.title',
 'item.description',
 'item.missingProp',
 'data.parcelLayer.primaryField'].reduce((acc, prop) => {
  // create the property name... you could do this however...
  let propName = prop.split('.').reverse()[0];
  return maybeAdd(propName, getProp(model, key), acc);
}, {});

// summary =>
// {
//   title: 'some example object',
//   description: 'this is some longer text',
//   primaryField: 'PIN'
// }

Parameters

Returns

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Function defined in common/src/util.ts:171