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Angular Tree Grid, Angular Sub Grid, Angular Grouping Grid

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I created two Angular packages in the past, one is ngtreegrid  and another one is angular-tree-grid . I often get asked about what is the difference between these two. Well that's a fair question! Let's figure out. ngtreegrid (Angular Grouping Grid) :  Let's suppose we have a list of books in our store. We want to see a list of books by type of book. books = [ { type: 'Programming' , name: 'Angular' , price: 90 }, { type: 'Programming' , name: 'Python' , price: 70 }, { type: 'Programming' , name: 'PHP' , price: 80 }, { type: 'Programming' , name: 'Java' , price: 50 }, { type: 'Physics' , name: 'Thermodynamics' , price: 50 }, { type: 'Physics' , name: 'Quantum Physics' , price: 20 }, { type: 'Physics' , name: 'Particle Physics' , price: 45 }, { type: 'Physics' , name: 'General Physics' , price: 55 } ]; Now le...