AngularJS is what HTML would have been, had it been designed for building web-apps. Declarative templates with data-binding, MVW, MVVM, MVC, dependency injection and great testability story all implemented with pure client-side JavaScript! object1 represent the list of objects in the view, object2 is data used for the action dispatch, object3 is the currently selected object that is in object1, object4 is the object sent in from the click handler in the html. on click, find the object make it active if it's not or if it isn't found dispatch action to create it.
Note that the aggregate property on the price column causes the grid to show the average price for each make in the group headers. The "wj-flex-grid" element contains a "wj-flex-grid-filter" element which adds the column filter, so users may filter the grid data by model and by price. IgxGrid supports multi-column headers which allows you to group columns by placing them under a common multi headers. Each multi-column headers group could be a representation of combinations between other groups or columns within the Material UI grid. Angular Grid Multi-column Headers Overview Example
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