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— I made bookstore app in angular . each books description has one button at the end add to library or remove from library. So before displaying any books description I do check if that book(object) is available in array of books(array of objects) which I already have added in library. If its present in array I display remove from library button or vice versa.
Probably this isn't best approach to make something like that but my whole code ain't less than pile of shit so I just decided to compare two objects 🙈