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hello this is Kristian welcome to angular and this video were going to implement delete operation in the crowd operation here when we click on the delete it grabs the flight or the the ID here which is number we call under the number column now these are not index positions these are the actual ID or the number we assigned to the data set so if you think about a database system or in relational database this would be like your primary IDs okay and were gonna grab this because these are unique right you want to use like you know Airlines or trip type all these stuff here the flight number may also be unique but we can choose either that or the ID number in the best option is to use the primary key so we use that and when we once we get a ID like if you press f2 all I showed you when I click on the delete four three it returns index of three so when that is returned to is sent to the function were going to match this ID look for this ID in the list here if you find that ID then return